Simplicity 083152-1204-F1 User manual

Category
Engine
Type
User manual
Foreword
This manual was written to assist engine technicians and service personnel with the repair and maintenance
procedures for Briggs & Stratton® engines. It assumes that persons using this manual have been properly
trained in and are familiar with the servicing procedures for these products, including the proper use of
required tools and safety equipment and the application of appropriate safety practices. Persons untrained
or unfamiliar with these procedures or products should not attempt to perform such work.
Proper maintenance and repair is important to safe, reliable operation of all engines and engine-driven
systems. The troubleshooting, testing, maintenance, and repair procedures described in this manual are
appropriate for the Briggs & Stratton engines described herein. Alternative methods or procedures may pose
risk to personal safety and the safety and/or reliability of the engine and are not endorsed or recommended
by Briggs & Stratton.
All information, illustrations, and specifications contained in this manual were based on the data available
at the time of publication. Briggs & Stratton Corporation reserves the right to change, alter, or otherwise
improve the product or the product manuals at any time without prior notice.
Briggs & Stratton offers two complementary publications to enhance understanding of engine technology,
maintenance, and repair. (Neither publication, however, is a substitution for a recognized training program
for engine technicians.)
• For consumers,
Small Engine and Equipment Maintenance Guide
(p/n CE8155) provides a comprehensive
overview of how small air-cooled engines work, basic troubleshooting, and step-by-step maintenance
procedures.
• For engine technicians and consumers alike, an in-depth study of engine theory and operation can be
found in the textbook
Small Engines
(p/n CE8020).
Both publications can be purchased at BRIGGSandSTRATTON.COM or through a local Briggs & Stratton
Authorized Service Dealer.
Copyright © 2015 Briggs & Stratton Corporation.
All rights reserved.
No part of this manual may be reproduced or transmitted in any form or by any means, electronic or
mechanical, including photocopying or recording by any information storage and retrieval system, without
prior written permission from Briggs & Stratton Corporation.
This engine repair manual includes the following engine model:
• MODEL 083100
1
SECTION 1 – GENERAL INFORMATION
2
SECTION 2 – SAFETY, MAINTENANCE AND ADJUSTMENTS
3
SECTION 3 – TROUBLESHOOTING
4
SECTION 4 – FUEL SYSTEM AND CARBURETION
5
SECTION 5 – CONTROLS AND GOVERNOR SYSTEM
6
SECTION 6 – LUBRICATION SYSTEM
7
SECTION 7 – CYLINDER HEAD AND VALVES
8
SECTION 8 – PISTON, RINGS AND CONNECTING ROD
9
SECTION 9 – CRANKSHAFT, CAMSHAFT AND FLYWHEEL
10
SECTION 10 – CYLINDER AND CRANKCASE COVER
11
SECTION 11 – GEAR REDUCTION UNIT
12
SECTION 12 – STARTER
13
SECTION 13 – EXHAUST SYSTEM
14
SECTION 14 – ENGINE SPECIFICATIONS
SECTION 1 – GENERAL INFORMATION
GENERAL INFORMATION - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 4
Engine Identification - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 4
Acronyms, Abbreviations and Meanings - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 4
Order of Engine Assembly and Disassembly - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 4
3
1
GENERAL INFORMATION
Engine Identification
Engine identification is located as shown (A).
1
Acronyms, Abbreviations and Meanings
MeaningAcronyms and
Abbreviations
Bottom Dead CenterBDC
Before Top Dead CenterBTDC
MagnetoMAG
Part Numberp/n
Power Take-OffPTO
Revolutions Per MinuteRPM
Top Dead CenterTDC
Top No-LoadTNL
Order of Engine Assembly and Disassembly
Section ProcedureSection
Number
Order of Disassembly
Change Oil2Drain oil
Service Spark Plug2Spark Plug
Change Air Filter2Air cleaner assembly
Section ProcedureSection
Number
Order of Disassembly
Remove Control Bracket5Control panel trim
Remove Control Bracket5Governor control bracket
Remove Control Bracket5Air cleaner base
Remove Carburetor4Carburetor
Disassemble Carburetor4Disassemble carburetor
Remove Fuel Tank4Fuel tank
Remove Rewind Starter12Rewind starter
Adjust Armature Air Gap2Blower housing
Remove Muffler13Exhaust manifold
Remove Flywheel9Armature
Remove Flywheel9Flywheel
Remove Breather6Rocker cover / breather
Remove Cylinder Head7Cylinder shield
Disassemble Cylinder Head7Rocker arms
Remove Cylinder Head7Push rods
Remove Cylinder Head7Cylinder head
Disassemble Cylinder Head7Valves, springs and seals
Remove Crankshaft and
Camshaft
9Crankcase cover
Remove PTO Bearing10PTO oil seal
Remove PTO Bearing10PTO bearing
Remove Crankshaft and
Camshaft
9Camshaft and tappets
Remove Piston and
Connecting Rod
8Connecting rod and piston
Remove Crankshaft and
Camshaft
9Crankshaft
Remove MAG Bearing10MAG oil seal
Remove MAG Bearing10MAG bearing
Section ProcedureSection
Number
Order of Assembly
Install MAG Bearing10MAG bearing
Install MAG Bearing10MAG oil seal
Install Crankshaft and
Camshaft
9Crankshaft
Install Piston and Connecting
Rod
8Connecting rod and piston
Install Crankshaft and
Camshaft
9Camshaft and tappets
Install PTO Bearing10PTO bearing
Install PTO Bearing10PTO oil seal
Install Crankcase Cover9Crankcase cover
Assemble Cylinder Head7Valves, springs and seals
Install Cylinder Head7Cylinder head
Install Cylinder Head7Push rods
Install Cylinder Head7Rocker arms
4 BRIGGSandSTRATTON.COM
1
Section ProcedureSection
Number
Order of Assembly
Adjust Valve Clearance2Adjust valve clearance
Install Breather6Rocker cover / breather
Install Cylinder Head7Cylinder shield
Install Flywheel9Flywheel
Install Flywheel9Armature
Adjust Armature Air Gap2Adjust armature air gap
Adjust Armature Air Gap2Blower housing
Install Rewind Starter12Rewind starter
Assemble Carburetor4Assemble carburetor
Install Carburetor4Carburetor
Install Control Bracket5Governor control bracket
Perform Static Governor
Adjustment
2Static governor adjustment
Install Control Bracket5Air cleaner base
Install Fuel Tank4Fuel tank
Install Control Bracket5Control panel trim
Change Air Filter2Air cleaner assembly
Install Muffler13Exhaust manifold
Service Spark Plug2Spark Plug
Change Oil2Fill engine with oil
5
1
6 BRIGGSandSTRATTON.COM
1
SECTION 2 – SAFETY, MAINTENANCE AND ADJUSTMENTS
SAFETY INFORMATION - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 8
Safety Alert Symbol and Signal Words - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 8
Hazard Symbols and Meanings - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 8
General Safety Messages - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 8
ENGINE MAINTENANCE - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 11
Maintenance Schedule - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 12
Fuel Recommendations - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 12
High Altitude - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 12
Oil Recommendations - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 12
Service Fuel Filter - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 12
In-Tank Fuel Filter - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 12
In-Line Fuel Filter - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 13
Change Oil - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 14
Change Air Filter - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 15
Service Spark Plug - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 16
Clean Air Cooling System - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 16
Clean Combustion Chamber - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 17
Storage - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 17
ENGINE ADJUSTMENTS - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 17
Adjust Armature Air Gap - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 18
Carburetor - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 19
Adjust Idle Speed - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 19
Remote Choke and Throttle Controls - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 19
Adjust Remote Choke Control - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 19
Adjust Remote Throttle Control - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 20
Governor - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 20
Perform Static Governor Adjustment - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 20
Adjust Idle Speed - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 21
Adjust Top No-Load Speed - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 21
Combustion Chamber - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 21
Adjust Valve Clearance - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 21
7
2
SAFETY INFORMATION
This repair manual contains safety information that is
designed to:
• Make you aware of hazards associated with engines.
• Inform you of the risk of injury associated with those
hazards.
• Instruct you how to avoid or reduce the risk of injury.
Safety Alert Symbol and Signal Words
The safety alert symbol indicates a potential personal
injury hazard. A signal word (DANGER, WARNING, or
CAUTION) is used with the alert symbol to designate a
degree or level of hazard seriousness. A safety symbol may
be used to represent the type of hazard. The signal word
NOTICE
is used to address practices not related to personal
injury.
DANGER indicates a hazard which, if not avoided,
will
result in death or serious injury.
WARNING indicates a hazard which, if not avoided,
could
result in death or serious injury.
CAUTION indicates a hazard which, if not avoided,
could
result in minor or moderate injury.
NOTICE
addresses practices not related to personal injury.
Hazard Symbols and Meanings
MeaningSymbolMeaningSymbol
Read and understand the
Operator's Manual before
operating or servicing the
unit.
Safety information
about hazards that can
result in personal
injury.
Explosion hazardFire hazard
Explosion hazardShock hazard
Toxic fume hazardHot surface hazard
Chemical hazardAmputation hazard -
moving parts
MeaningSymbolMeaningSymbol
Thrown object hazard -
wear eye protection
Kickback hazard
Amputation hazard -
entanglement
General Safety Messages
Prior to work, read and understand the section(s) of this
manual that pertain to the job. Follow all safety warnings.
• Always use fresh gasoline. Stale fuel can cause gum
deposits in the carburetor and cause leakage, flow
restrictions, or other problems.
• Check fuel lines and fittings frequently for cracks or
leaks and replace if necessary.
WARNING
Before attempting to service this equipment, read and
understand this manual and the operating instructions of
the engine and the equipment.
WARNING
Failure to follow instructions could result in serious injury
(including paralysis) and even death.
WARNING
Battery post, terminals, and related accessories contain
lead and lead compounds - chemicals known to the State
of California to cause cancer and reproductive harm. Wash
hands after handling.
WARNING
Certain components in this product and its related
accessories contain chemicals known to the State of
California to cause cancer, birth defects, or other
reproductive harm. Wash hands after handling.
8 BRIGGSandSTRATTON.COM
2
WARNING
Briggs & Stratton Engines are not designed for and are
not to be used to power: fun-karts; go-karts; children's,
recreational, or sport all-terrain vehicles (ATVs);
motorbikes; hovercraft; aircraft products; or vehicles used
in competitive events not sanctioned by Briggs & Stratton.
For information about competitive racing products, see
www.briggsracing.com. For use with utility and
side-by-side ATVs, please contact Briggs & Stratton
Engine Application Center, 1-866-927-3349. Improper
engine application may result in serious injury or death.
WARNING
The engine exhaust from this product contains chemicals
known to the State of California to cause cancer, birth
defects, or other reproductive harm.
WARNING
Fuel and its vapors are extremely flammable and explosive
which could cause burns, fire or explosion resulting in
death or serious injury.
When Adding Fuel
• Turn engine OFF and let engine cool at least 2 minutes
before removing the fuel cap. Loosen cap slowly to
relieve pressure in tank.
• Fill fuel tank outdoors or in well-ventilated area.
• Do not overfill fuel tank. To allow for expansion of the
fuel, do not fill above the bottom of the fuel tank neck.
• Keep fuel away from sparks, open flames, pilot lights,
heat, and other ignition sources.
• Check fuel lines, tank, cap, and fittings frequently for
cracks or leaks. Replace if necessary.
• If fuel spills, wait until it evaporates before starting
engine.
• Do not light a cigarette or smoke.
When Starting Engine
• Ensure that spark plug, muffler, fuel cap and air cleaner
(if equipped) are in place and secured.
• Do not crank engine with spark plug removed.
• If engine floods, set choke (if equipped) to OPEN / RUN
position, move throttle (if equipped) to FAST position
and crank until engine starts.
When Operating Equipment
• Do not operate this product inside any building, carport,
porch, mobile equipment, marine applications, or
enclosure.
• Do not tip engine or equipment at angle which causes
fuel to spill.
• Do not choke the carburetor to stop engine.
• Never start or run the engine with the air cleaner
assembly (if equipped) or the air filter (if equipped)
removed.
When Changing Oil
• If you drain the oil from the oil fill hole (not
recommended), the fuel tank must be empty or fuel can
leak out and result in a fire or explosion.
When Tipping Unit for Maintenance
• When performing maintenance that requires the unit to
be tipped, the fuel tank, if mounted on the engine, must
be empty or fuel can leak out and result in a fire or
explosion.
When Transporting Equipment
• Transport/move/repair with fuel tank EMPTY or with
fuel shutoff valve OFF.
• Do not tip engine or equipment at angle which causes
fuel to spill.
• Disconnect spark plug wire.
When Storing Fuel or Equipment with Fuel In Tank
• Store away from furnaces, stoves, water heaters,
clothes dryers, or other appliances that have pilot light
or other ignition source because they could ignite fuel
vapors.
WARNING
Starting engine creates sparking which could ignite nearby
flammable gases causing explosion or fire resulting in
death or serious injury.
• If there is natural or LP gas leakage in the area, do not
start engine.
• Do not use pressurized starting fluids because vapors
are flammable.
9
2
WARNING
POISONOUS GAS HAZARD. Engine exhaust contains
carbon monoxide, a poisonous gas that could kill you in
minutes. You CANNOT see it, smell it, or taste it. Even if
you do not smell exhaust fumes, you could still be exposed
to carbon monoxide gas. If you start to feel sick, dizzy, or
weak while using this product, get to fresh air RIGHT
AWAY. See a doctor. You may have carbon monoxide
poisoning.
• Operate this product ONLY outside far away from
windows, doors and vents to reduce the risk of carbon
monoxide gas from accumulating and potentially being
drawn towards occupied spaces.
• Install battery-operated carbon monoxide alarms or
plug-in carbon monoxide alarms with battery back-up
according to the manufacturer's instructions. Smoke
alarms cannot detect carbon monoxide gas.
• DO NOT run this product inside homes, garages,
basements, crawlspaces, sheds, or other
partially-enclosed spaces even if using fans or opening
doors and windows for ventilation. Carbon monoxide
can quickly build up in these spaces and can linger for
hours, even after this product has shut off.
• ALWAYS place this product downwind and point the
engine exhaust away from occupied spaces.
WARNING
Starter cord kickback (rapid retraction) will pull hand and
arm toward engine faster than you can let go which could
cause broken bones, fractures, bruises, or sprains
resulting in serious injury.
• When starting engine, pull the starter cord slowly until
resistance is felt and then pull rapidly to avoid kickback.
• Remove all external equipment / engine loads before
starting engine.
• Direct-coupled equipment components such as, but not
limited to, blades, impellers, pulleys, sprockets, etc.,
must be securely attached.
WARNING
Rotating parts could entangle hands, feet, hair, clothing,
or accessories resulting in serious injury.
• NEVER operate equipment without protective housing
or covers in place.
• DO NOT wear loose clothing, jewelry or anything that
could become entangled in the equipment.
• Tie up long hair and remove jewelry.
• Keep hands and feet away from rotating parts.
WARNING
Running engines produce heat. Engine parts, especially
mufflers, become extremely hot which could cause severe
thermal burns or catching fire to combustible debris, such
as leaves, grass, brush, etc., resulting in serious injury.
• Allow muffler, engine cylinder and fins to cool before
touching.
• Remove accumulated debris from muffler area and
cylinder area.
• It is a violation of California Public Resource Code,
Section 4442, to use or operate the engine on any
forest-covered, brush-covered, or grass-covered land
unless the exhaust system is equipped with a spark
arrester, as defined in Section 4442, maintained in
effective working order. Other states or federal
jurisdictions may have similar laws. Contact the original
equipment manufacturer, retailer, or dealer to obtain a
spark arrester designed for the exhaust system installed
on this engine.
WARNING
Unintentional sparking could cause fire or electric shock
resulting in death or serious injury.
Unintentional start-up could result in entanglement,
traumatic amputation, or laceration.
Before performing adjustments or repairs:
• Disconnect the spark plug wire and keep it away from
the spark plug.
• Disconnect battery at negative terminal (only engines
with electric start.)
• Use only correct tools.
• Do not tamper with governor spring, links or other parts
to increase engine speed.
• Replacement parts must be of the same design and
installed in the same position as the original parts. Other
parts may not perform as well, may damage the unit,
and may result in injury.
• Do not strike the flywheel with a hammer or hard object
because the flywheel may later shatter during operation.
When testing for spark:
• Use approved spark plug tester.
• Do not check for spark with spark plug removed.
10 BRIGGSandSTRATTON.COM
2
WARNING
Charging batteries produce hydrogen gas which could
cause explosion resulting in death or serious injury.
• Do not store or charge a battery near an open flame or
device that utilizes a pilot light or can create a spark.
WARNING
Damaged, worn, or loose fuel components can leak fuel
which could cause explosion or fire resulting in death or
serious injury.
• All fuel components should be in good condition and
properly maintained.
• Repairs should only be made with factory approved
parts.
• Repair work should be done by a qualified technician.
• Flexible supply lines should be checked regularly to
make sure they are in good condition.
WARNING
Prolonged or repeated contact with used motor oil could
cause injury.
• Used motor oil has been shown to cause skin cancer
in certain laboratory animals.
• Thoroughly wash exposed areas with soap and water.
NOTICE
Failure to follow instructions could result in property
damage.
11
2
ENGINE MAINTENANCE
Maintenance Schedule
First 5 Hours
• Change oil
Every 8 Hours or Daily
• Check engine oil level
• Clean area around muffler and controls
• Clean finger guard
Every 25 Hours or Annually
• Clean air filter *
• Clean pre-cleaner *
Every 50 Hours or Annually
• Check muffler and spark arrester
Every 100 Hours or Annually
• Change engine oil
Annually
• Replace air filter
• Replace pre-cleaner
• Replace spark plug
• Replace fuel filter
• Clean air cooling system *
* In dusty conditions or when airborne debris is present, clean more
often.
Fuel Recommendations
Fuel must meet these requirements:
• Clean, fresh, unleaded gasoline.
• A minimum of 87 octane / 87 AKI (91 RON). For high
altitude use, see below.
• Gasoline with up to 10% ethanol (gasohol) is
acceptable.
NOTICE
Do not use unapproved gasolines, such as E15
and E85. Do not mix oil in gasoline or modify the engine
to run on alternate fuels. Use of unapproved fuels will
cause damage to engine components, which will not be
covered under warranty.
To protect the fuel system from gum formation, mix a fuel
stabilizer into the fuel. See Storage. All fuel is not the same.
If starting or performance problems occur, change fuel
providers or change brands. This engine is certified to
operate on gasoline. The emissions control system for this
engine is EM (Engine Modifications).
High Altitude
At altitudes over 5,000 feet (1524 meters), a minimum 85
octane / 85 AKI (89 RON) gasoline is acceptable.
For carbureted engines, high altitude adjustment is required
to remain emissions compliant. Operation without this
adjustment will cause decreased performance, increased
fuel consumption, and increased emissions. Contact a
Briggs & Stratton Authorized Service Dealer for high altitude
adjustment information. Operation of the engine at altitudes
below 2,500 feet (762 meters) with the high altitude
adjustment is not recommended.
For Electronic Fuel Injection (EFI) engines, no high altitude
adjustment is necessary.
Oil Recommendations
We recommend the use of Briggs & Stratton Warranty
Certified oils for best performance. Other high-quality
detergent oils are acceptable if classified for service SF,
SG, SH, SJ or higher. Do not use special additives.
Outdoor temperatures determine the proper oil viscosity for
the engine. Use the chart to select the best viscosity for the
outdoor temperature range expected.
A SAE 30 Below 40 °F (4 °C) the use of SAE 30 will result in hard
starting.
B 10W-30 Above 80 °F (27 °C) the use of 10W-30 may cause increased
oil consumption. Check oil level more frequently.
C Synthetic 5W-30
D 5W-30
Service Fuel Filter
When the fuel tank is mounted to the engine, refer to
In-Tank Fuel Filter
. When the fuel tank is NOT mounted to
the engine, refer to
In-Line Fuel Filter
.
12 BRIGGSandSTRATTON.COM
2
In-Tank Fuel Filter
1. Drain fuel tank by running engine until fuel tank is
empty.
2. Disconnect the spark plug wire from the spark plug (A).
3. Remove the air filter cover and air filter (B) as instructed
in
Change Air Filter
found in this section.
4. Remove the control panel trim screw (D) and two nuts
(C) from fuel tank.
5. Remove screw from opposite side of fuel tank (E).
6. Lift fuel tank and slide fuel line clamp (F) away from
fuel filter. Remove fuel line (G) with fuel line removal
tool (p/n 19600).
7. Remove fuel filter and o-ring (H) from tank and check
for dirt or debris; clean or replace as necessary.
8. Install cleaned or new fuel filter and o-ring into fuel tank.
Torque fuel filter to the value listed in
Section 14 -
Engine Specifications
.
NOTE: Make sure o-ring is seated in groove of fuel filter.
9. Check the fuel line for cracks or leaks. Replace if
necessary.
10. Install fuel line with clamp onto fuel filter making sure
clamp retains fuel line securely (F, G).
11. Install tank onto engine. Install screw (E), nuts (C) and
control panel trim screw (D). Torque screws and nuts
to the values listed in
Section 14 - Engine
Specifications
.
12. Install the air filter and air filter cover (B) as instructed
in
Change Air Filter
found in this section.
13. Reconnect the spark plug wire to the spark plug (A).
2
3
13
2
In-Line Fuel Filter
1. Drain fuel tank by running engine until fuel tank is
empty.
2. Disconnect the spark plug wire from the spark plug.
3. Slide the clamps (A) away from the fuel filter (C). Twist
and pull the fuel lines (B) off fuel filter. Discard the fuel
filter.
4. Check the fuel lines for cracks or leaks. Replace if
necessary.
5. Install a new fuel filter (C) between fuel lines (B) and
secure with clamps (A). Make sure arrow on fuel filter
points in the direction of fuel flow.
6. Reconnect the spark plug wire to the spark plug.
4
Change Oil
WARNING
Fuel and its vapors are extremely flammable and
explosive.
Fire or explosion can cause severe burns or death.
Running engines produce heat. Engine parts, especially
muffler, become extremely hot.
Severe thermal burns can occur on contact.
• If you drain the oil from the oil fill hole (not
recommended), the fuel tank must be empty or fuel can
leak out and result in a fire or explosion.
• Allow muffler, engine cylinder and fins to cool before
touching.
CAUTION
Avoid prolonged or repeated skin contact with used motor
oil.
• Used motor oil has been shown to cause skin cancer
in certain laboratory animals.
• Thoroughly wash exposed areas with soap and water.
Used oil is a hazardous waste product and must be
disposed of properly. Do not discard with household waste.
Check with your local authorities, service center, or dealer
for safe disposal/recycling facilities.
• Place engine level.
• Clean the oil fill area of any debris.
• See
Section 14 - Engine Specifications
for oil
capacity.
1. Drain fuel tank by running engine until fuel tank is
empty.
2. With engine off but still warm, disconnect the spark plug
wire and keep it away from the spark plug.
3. Clean area around oil fill. Remove oil fill cap/dipstick
(A) and wipe with a clean cloth (B).
4. Remove one of the oil drain plugs located at the base
of the engine (C). Drain the oil into an approved
container.
5. Reinstall the oil drain plug and tighten to the
recommended torque listed in
Section 14 - Engine
Specifications.
6. Slowly pour fresh oil of proper weight and classification
into the oil fill opening (D). Pause to permit oil to settle.
Insert the dipstick; do not turn or tighten.
7. Remove dipstick and wipe clean. Reinsert dipstick but
do not screw it in. Remove dipstick and check the oil
level (E). It should be within the hatch area on the
dipstick. DO NOT overfill.
8. Reinstall dipstick and tighten hand tight.
9. Wipe up any remaining oil.
10. Reconnect the spark plug wire to the spark plug.
14 BRIGGSandSTRATTON.COM
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5
6
Change Air Filter
A correctly serviced air filter protects internal engine parts
from airborne dirt and dust. Poor filter maintenance will allow
dirt and dust to be drawn into the engine, causing wear to
the intake system and contamination of the oil. Dirt in the
oil forms an abrasive mixture which wears down moving
parts.
WARNING
Fuel and its vapors are extremely flammable and explosive
which could cause burns, fire or explosion resulting in
death or serious injury.
• Never start or run the engine with the air cleaner
assembly or the air filter removed.
NOTICE
Do not use pressurized air or solvents to clean
the filter. Pressurized air can damage the filter and
solvents will dissolve the filter.
1. Remove knob (A) from air cleaner cover (B), then
remove air cleaner cover.
2. Remove nut (C) from air filter assembly (D and E) or
(G, H and J), then remove air filter assembly.
3. Remove foam pre-cleaner (E) from air filter cartridge
(D).
4. Gently tap air filter cartridge on a hard surface to loosen
debris. Replace cartridge if very dirty.
5. Wash foam pre-cleaner in warm, soapy water, then
rinse and allow to air dry.
6. Foam Filter (H) Only: Wash the foam element (H) in
liquid detergent and water. Squeeze dry the foam
element in a clean cloth. Saturate the foam element
with clean engine oil. To remove the excess engine oil,
squeeze the foam element in a clean cloth.
7. Assemble dry foam pre-cleaner (E) to air filter cartridge
(D).
8. Install air filter assembly (D and E) or (G, H and J) onto
air cleaner base (F) and retain using the nut (C). Do
not over-tighten.
9. Install air cleaner cover (B) and retain using knob (A).
Do not over-tighten.
15
2
7
Service Spark Plug
NOTICE
Spark plugs have different thread lengths and
heat ranges. When changing a spark plug, use only the
specified replacement or engine damage could occur.
NOTE: In some areas, local law requires using a resistor
spark plug to suppress ignition signals. If this engine was
originally equipped with a resistor spark plug, use the same
type for replacement.
1. Disconnect the spark plug wire.
2. Remove and inspect spark plug for wear and damage.
Replace spark plug if electrodes are burned away or if
the porcelain is cracked.
3. Do not sand-blast or bead-blast the spark plug. Clean
by scraping or wire brushing and then washing in a
commercial solvent.
4. Using a wire gauge, check and set the gap (A) to the
value listed in
Section 14 - Engine Specifications.
8
5. Install spark plug by hand and tighten finger tight. Then
torque to the value listed in
Section 14 - Engine
Specifications.
6. Connect the spark plug wire.
Clean Air Cooling System
WARNING
Running engines produce heat. Engine parts, especially
muffler, become extremely hot.
Severe thermal burns can occur on contact.
Combustible debris, such as leaves, grass, brush, etc.,
can catch fire.
• Allow muffler, engine cylinder and fins to cool before
touching.
• Remove accumulated debris from muffler area and
cylinder area.
NOTICE
Do not use water to clean the engine. Water
could contaminate the fuel system. Use a brush or dry
cloth to clean the engine.
This is an air cooled engine. Dirt or debris can restrict air
flow and cause the engine to overheat, resulting in poor
performance and reduced engine life.
1. Use a brush or dry cloth to remove debris from the air
intake area (A).
2. Keep linkage, springs and controls (B) clean.
3. Keep the area around and behind the muffler (C) free
of any combustible debris.
4. Use a brush, vacuum and/or compressed air to remove
debris from cylinder cooling fins.
After a period of time, debris can accumulate in the cylinder
cooling fins and cause the engine to overheat. This debris
cannot be removed without partial disassembly of the
engine. Have a Briggs & Stratton Authorized Dealer inspect
16 BRIGGSandSTRATTON.COM
2
and clean the air cooling system as recommended in the
Maintenance Schedule.
9
Clean Combustion Chamber
Remove combustion chamber deposits every 500 hours or
whenever the cylinder head is removed.
With the piston at Top Dead Center (TDC), scrape deposits
from top of piston and upper bore with a plastic scraper.
Remove the loosened deposits from around the top ring
land area using compressed air or a shop vacuum and a
soft bristle brush.
NOTICE
Use care to prevent debris from entering the
engine.
Do not damage bore, top of piston, cylinder head or gasket
mounting surfaces.
It is not necessary to remove the discoloration marks on
the piston, valves and/or cylinder head. These marks are
normal and will not affect engine operation.
Storage
Fuel can become stale when stored over 30 days. Stale
fuel causes acid and gum deposits to form in the fuel system
or on essential carburetor parts. To keep fuel fresh, use
Briggs & Stratton® Advanced Formula Fuel Treatment
& Stabilizer, available wherever Briggs & Stratton genuine
service parts are sold.
There is no need to drain gasoline from the engine if a fuel
stabilizer is added according to instructions. Run the engine
for 2 minutes to circulate the stabilizer throughout the fuel
system before storage. If gasoline in the engine has not
been treated with a fuel stabilizer, it must be drained into
an approved container. Run the engine until it stops from
lack of fuel. The use of a fuel stabilizer in the storage
container is recommended to maintain freshness.
17
2
ENGINE ADJUSTMENTS
Adjust Armature Air Gap
1. Disconnect spark plug wire from spark plug. Secure
spark plug wire away from spark plug.
2. Remove air cleaner cover and air filter (A) as instructed
in
Change Air Filter
found in this section.
3. Remove knob (B) from throttle control lever.
4. Remove two nuts (D) and two screws (C) and then
remove the control panel trim from the engine.
5. Remove fuel line (E) from carburetor.
6. Remove four screws (F) that attach the blower housing
to the engine.
10
7. Carefully remove the blower housing from the engine
and set aside.
8. Turn flywheel so magnet is away from armature legs.
9. Loosen two screws (J and K).
10. Slide Armature (H) away from flywheel.
11. Tighten screw (K) to secure Armature.
12. Turn flywheel so magnet is aligned with armature legs
(G).
11
13. Insert a gauge 0.008 - 0.016 in. (0.2 - 0.4 mm) thick
between the flywheel and the armature legs (M).
14. Loosen screw (K). Press the armature legs (H) tight
against the flywheel.
12
15. Torque both screws (J and K) to the value listed in
Section 14 - Engine Specifications
.
16. Rotate flywheel to remove gauge (M).
18 BRIGGSandSTRATTON.COM
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Simplicity 083152-1204-F1 User manual

Category
Engine
Type
User manual

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