PARTS
LIST
Unlvarsal
MARINE
DIESEL
ENGINE
M3-20B
PUBLICATION
NO.
201009
1ST
Edition
June
2001
WESTERBEKE
CORPORATION'
MYLES
STANDISH
INDUSTRIAL
PARK
150 JOHN HANCOCK ROAD, TAUNTON,
MA
02780-7319 U.S.A.
WEBSITE: www.WESTERBEKE.COM
nrnr
NMUA
Member
National
Marine
Manufacturus
Association
s.as
.
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43
45
47
WESTERBEKE UNIVERSAL
M3·20B Marine Diesel Engine
TABLE OF CONTENTS
DESCRIPTION
Cylinder
Block
Assembly
Oil Pan
Assembly,
Lube
Oil
Switch
and
Sender
Cylinder
Head
Assembly
Gear Case
Assembly
Piston,
Crankshaft
and Main
Bearings
Cylinder
Head
Cover
and
Air
Intake
Exhaust
Manifold
and
Heat
Exchanger
Fuel
Injection
Pump
and
Fuel
Camshaft
Valve
Rocker
Arm
Assembly
Camshaft
Assembly
Governorlldler
Assembly
Hozzle
Holder
and
Injectors
Governor
Assembly
Cooling
System
Raw
Water
Pump
Fuel
Filter
and Oil Drain Hose
Systems
Flyvyheel and
Starter
Assembly
Bell
Housing
and
Transmission
Alternator
Assembly
Throttle
Assembly
Electrical System
Propulsion
Instrument
Panels
Miscellaneous
Numerical Part
Index
M3-20B
4
19
8
16
18
15
11
Cylinder Block A
ssembly
4
5
5
7
Page 1
1
2
5
6
6
6
M3-20B
Cylinder Block Assembly
Key
# Part #
Deseri ptio n
Qty
301201
Plug,
Expansion
2
2
302429 Plug, Expansion
1
3
299360 Pin, Straight
2
4
200597 Plug
5
5
302587 Plug
3
6
302589 Plug
5
7
302588 Plug
1
8
300716
Pin, Pipe
2
9
200589 Gasket, Oil Pump
1
10
301203
Assembly,
Oil
Pump
1
11
301545 Capscrew M12
3
12
302684 Nut, Hex
1
13 299413 Washer, Claw
1
14
301205
Gear, Oil Pump Drive
1
15
298820 Key, Feather
1
16
200596 Plug
3
17 301547
Pin, Pipe
2
18
013341
Plug, 1/4 NPT, Hex Head (Brass)
1
19 301543
Pin, Straight
2
20
301485 Pin, Pipe
1
21
299362 O-Ring
1
22
303030 Mount, Front Right
1
303031
Mount, Front Left (Not Shown)
1
23
040966 Nut, Jam, M16 Self-Locking
5
24
031828
Washer, Flat 5/8
SAE
Steel
2
25
040510 Isolator, Marine, 75-130
LB
2
26
024952
Capscrew, M10x1.25x25 DIN
961
6
27
019262 Lockwasher, M10
DIN
127
6
Page 2
M3-20B Oil Pan Assembly Lube Oil Switch and Sender
14
~
'U+--4
)
12
Page 3
M3-20B
Oil
Pan Assembly, Lube Oil Switch and Sender
Key#
Part #
Description Qty
1
039385
Hose,
Oil
1
2
024844 Adapter, 1/8 BSPT
to
1/8
NPT 1
3
013340
Elbow,
1/8 NPT
90
Street (Brass) 2
4
032480
Bracket, Oil Pressure Sender 1
5
037323 Switch, Oil Pressure
#5
- 1/8 2T 1
6
019369
Plug,
Hex Head, 1/8 NPT (Brass) 1
7
301212 Dipstick
1
8 299967
O-Ring 1
9
200588
Strainer, Oil Pickup 1
10
016789 Capscrew,
M8
x 16
DIN
933
11
302762
Gasket, Sump
1
12
035785 Capscrew, M6 x 12 JIS 6 w/Lockwasher 18
13
302761 Sump, Oil
1
14
024132
Sender, Oil Pressure (Optional with Admiral Panel) 1
Page 4
M3-20B Cylinder Head Assembly
1
1
Page 5
M3-20B Cylinder Head Assembly
Key #
Part # Description
Qty
1 301549
Eye,
Lifting
2
2
200615
Assembly, Cylinder
Head (Includes Key Nos. 4 thru
8,
11
& 12)
3
301217 Bolt, Cylinder Head
14
4
301214 Guide, Intake Valve
3
5
301215 Guide, Exhaust Valve
3
6
301550 Plug
1
7
302690 Plug, Expansion
2
8
299906
Plug,
Expansion, 30MM DIN 443 (Brass) 1
9
016789 Capscrew, M8 x 16 DIN 933
2
10
200613
Gasket, Cylinder Head
11
302593 Plug
12
299362
O-Ring
Page 6
M3-20B Gear Case Assembly
21
2
1
13
A~15
-\
~6
18 17
13
11
Page 7
7
8
M3-20B
Gear
Case Assembly
Key
# Part #
Description
illY
1
302692
Assembly, Gear Case (Includes Key Nos.4,
11
& 20)
2 299365 Capscrew, M6 x 18 JIS
1
3 302693
Gasket, Timing Case
1
4
300160 O-Ring
3
5 301554
Spring, Oil Relief Valve
1
6 301556
Ball, Oil Relief Valve
1
7 301555
Seat, Valve Cap, Oil Relief Valve
8 302625
Filter,
Oil
1
9
301490 Adapter,
Oil
Filter
1
10 301222
Washer,
Oil Adapter Nipple
1
11
302593 Plug
12
12-1
034212
Capscrew, M6 x 75
DIN
931
1
12-2
031783
Lockwasher,
M6
DIN 127
1
13
301552 Bolt
3
14
302697
Seal, Oil
1
15 302679
Clamp, Sea Water Pump Mount
2
16
031783
Lockwasher,
M6
DIN 127
2
17
020628
Capscrew, M6 x 25 DIN 933
2
18 042175
Pump, Raw Water
1
19
302678
Gasket,
Sea Water Pump Mount
1
20
301551 Pin, Start Spring
21-1
039248
Capscrew, M6 x
70
DIN
931
21-2 031783
Lockwasher,
M6
DIN 127
Page 8
2
M3-20B Piston, Crankshaft and Main Bearings
,//
: 1-1
\..
""~~;;;)
1-,
/1-2
1_-
(~
1
5
•
1
1
1
5---;
5-2
5-3
5-4
2
6
______
1
_______
,
/ \
6-1
Page 9
17
1-1
1-2
2
3
3-1
3-2
4
5
5-1
5-2
5-3
5-4
5-5
6
6-1
6-2
200598
200581
299490
200582
200584
200583
200586
200585
200587
301639
301640
302726
200610
200563
300813
M3-20B Piston, Crankshaft and Main Bearings
Description
Piston Ring Set (Includes
1-1
or 1-2)
Assembly,
Piston Ring, Standard
Assembly,
Piston Ring,
25
Cir-clip, Piston
Pin
Piston (Includes
Key
No.
3-1
or
3-2)
Piston, Standard
Piston, .25
Pin,
Piston
Assembly, Connecting
Rod
(Includes Key No.
5-1
or 5-2)
Bushing, Connecting
Rod
Bearing, Connecting
Rod
Set, Standard
Bearing, Connecting
Rod
Set,
.2
MM
Bearing, Connecting
Rod
Set, A
MM
Bolt, Connecting
Rod
Assembly, Crankshaft (Includes
Key
Nos.
6-1
& 6-2)
Ball
Bushing, Crankshaft
7 299549
Key,
Feather
8 Bearing, Crankshaft
(Includes Key
No.
8-1, 8-2 or 8-3
8-1
301282 Bearing, Main Standard
8-2
301641
Bearing, Main, 0.2MM
8-3 301642 Bearing, Main,
Oo4MM
9
301281
Gear, Crankshaft
10
302731
Slinger, Oil
11
301289 O-Ring
12 301287 Collar, Crankshaft
13
13-1
13-2
13-3
14
14-1
14-2
14-3
15
15-1
15-2
15-3
16
16-1
16-2
16-3
17
18
19
Bearing, Crankshaft (Includes Key
No.
13-1, 13-2 or 13-3)
200605 Bearing, Crankshaft, Standard
301645 Bearing, Crankshaft,
.2MM
301646 Bearing, Crankshaft,
o4MM
Thrustwasher (Includes Key No. 14-1,14-2 or 14-3)
299503 Thrustwasher, Standard
301649 Thrustwasher, .2MM
301650 Thrustwasher,
o4MM
Bearing, Crankshaft (Includes
Key
No. 15-1, 15-2 or 15-3)
200604 Bearing, Crankshaft, Standard
300754 Bearing, Crankshaft,
.2
300755 Bearing, Crankshaft, A
Thrustwasher (Includes
Key
No. 16-1,16-2 or 16-3)
299502 Thrustwasher, Standard
301647 Thrustwasher, .2MM
301648 Thrustwasher,
o4MM
018804 Capscrew,
M6
x
20
DIN
933
301231
Seal, Oil
Bolt
20
301228 Cover, Bearing Case
21
22
23
24
25
26
27
302698 Bolt, Bearing Case
301229 Gasket,
Oil
Seal Flange Rear
200578 Assembly, Main Bearing Case
301227 Gasket, Oil Seal Flange Rear
200600 Assembly, Main Bearing Case
200577 Assembly, Main Bearing Case
301235 Bolt, Bearing Case
Page
10
3
3
3
6
3
3
3
3
3
3
3
3
3
6
1
3
1
2
2
2
1
2
2
2
2
2
2
8
1
8
6
1
2
M3-20B Cylinder Head Cover and Air Intake
Page
11
M3-20B Cylinder Head Cover and Air Intake
Key#
Part
# Description Qty
1 302707 Cap, Oil Filler
1
2
298740 O-Ring
1
3 200566 Nut, Cap
3
4
301241 Gasket, Rocker Cover Stud
1
5
200601 Cover, Rocker
1
6
200602 Gasket, Rocker Cover
7
300977
Elbow, Male 1/8 NPT x 1/4 Tube
8
024906 Clamp, Hose
2
9
301560 Hose, Breather
1
10 301558 Plate, Breather Element
1
11
301237 Element, Breather
1
12
301557 Plate, Breather Element
1
13
301559 Oil Shield, Breather
1
14
301399
Screw, M5 x 10 w/lockwasher
2
15
200694
Assembly, Inlet Manifold (Includes Key Nos. 16 & 17)
1
16
302770 Gasket, Inlet Manifold
1
17
302769 Manifold, Inlet
1
18
035789 Capscrew, M6 x 45 JIS w/Lockwasher
1
19
021878 Clamp, Hose 20
1
20 300429 Element, Air Filter
1
21
301926 Silencer, Intake
1
22 300983
Clip, Spring-Breather Hose
1
23
299365 Capscrew, M6 x 18
JIS
2
Page 12
M3-20B Exhaust Manifold and Heat Exchanger
4
21
Page
13
12
M3-20B Exhaust Manifold and Heat Exchanger
Key # Part #
Description
Qty
1 302400 Manifold,Exhaust
2
024306 Cap, Pressure 15 PSI
3 299823
Hose, 5/8"
(4
Inches Required)
4
301061 Nipple, 3/8 NPT x 5/8 Hose
5
011341 Clamp, Hose 08
1
6 302785 Gasket, Exhaust Manifold
1
7
036838 Nipple, 3/4 NPT x 7/8 Hose
1
8 011386 Clamp, Hose 12
6
9
019059 Hose, 7/8" Wire Inserted (
26
Inches Required)
1
10
022851
Gasket, Exchanger 2-3/4"
11
022850 Cap, Exchanger 2-3/4"
in
1 Hole 1
12
022852 Capscrew, 3/8 NC x 3/4 (Brass)
1
13
019321 O-Ring, Exchanger End Cover 1
14
031552 Capscrew, 5/16 NC x 5/8
2
15
031758 Lockwasher, 5/16 Split
Med
(Steel)
2
16
031759 Washer, Flat 5/16 SAE (Steel) 2
17
303145 Exchanger, Heat
1
18
303146
Pad,
Exchanger Mount
1
19
298974 Stud, Manifold End
1
20 011885 Zinc
1
21
031766 Nut, Hex 3/8-24 NF (Steel)
3
22
031764
Lockwasher, 3/8
Split Med (Steel)
3
23
298599 Flange, Exhaust 1.25
NPT 1
24
298600 Gasket, Exhaust Flange
1
25 287077
Plug,
Sq
Head 3/8 NPT (Brass)
1
26
012506 Stud, 3/8 NC x 3/8 NF x 1-5/8
2
27
302083 Stud, M6 x 85
6
28 031783 Lockwasher, M6
DIN
127
6
29
015812
Nut, Hex M6 DIN 934
6
30
024977 Kit, Coolant Recovery Tank
1
31
024786 Strap, Coolant Recovery Tank
32
024704 Tank, Coolant Recovery
1
33
024858 Cap, Coolant Recovery Tank
1
34
024637 Tubing, Manifold to Recovery Tank
35
024906
Clamp, Hose 1
36-1
036660 Bushing, Exhaust Elbow
to
Manifold (45 Deg. or
90
Deg. Elbow)
1
36-2
021876
Bushing, Exhaust Elbow
to
Manifold, 1.5 to 1.25
NP
-Exh Riser
1
37-1
302207 Elbow, Water Injected Exhaust-45 Deg, 1.25 NPT
1
37-2
200385 Elbow, Water Injected Exhaust-90 Deg, 1.5 NPT
1
37-3
200266 Riser, Exhaust, 1.25 NPT
1
38-1
302217
Elbow, 1/2 NPT x 5/8 Hose
90
(w/ 302207 or 200385-Exh Riser 1
38-2
302258 Elbow, 3/4 NPT x 5/8 Hose (w/ 200266 Exhaust Elbow)
39-1
035747
Plug,
1/2 NPT Elbow (with 036547 Elbow)
39-2
013341 Plug, Hex-Head Brass, 1/4 NPT (w/200266 Exh Riser)
Page 14
M3-20B Fuel Injection Pump and Fuel Camshaft
10~
7---E!:I'
/
12
22
23
\
17
1a
20
Page 15
6P
7~
Va
M3-20B Fuel Injection Pump and Fuel Camshaft
Key # Part #
Description Qty
1 301749
Screw, Bleed
2 301750 Washer, Bleed
Screw
3
301751 Bolt, Banjo
1
4 301752 Washer, Banjo 2
5 301314 Banjo, Injection Pump
6
039874 Capscrew, M6 x
20 DIN 912 2
7
031783 Lockwasher, M6 DIN 127 4
8
200695 Gasket, Injector 1
10
301313
Nut, Cap
2
11
200572 Assembly, Injection Pump
12
200574 Shim, Injection Pump .25MM
200573 Shim, Injection Pump .20MM (Not shown)
1
13
200575 Shim, Injection Pump .30MM 1
14 301312
Stud
2
200603 Assembly, Fuel Camshaft (Includes Key No.'s 15 thru 27)
1
15
301320 Ring, Retaining (External) 1
16
301319 Ball Bearing 1
17
302782 Camshaft, Fuel 1
18 299549 Key, Feather 1
19
301317 Ball Bearing 1
20 301574 Stopper, Fuel Cam 1
21
035785 Capscrew, M6 x
12
J
IS
w/Lockwasher 2
22 300198 Cir -Clip, Governor Sleeve 1
23
301572 Case, Governor Ball Bearing 1
24 301573 Ball, Governor 32
25
301571 Sleeve, Governor 1
26 299534 Ball
8
27
200590 Gear, Injection Pump 1
Page 16
M3-20B Valve Rocker Arm Assemly
17
11
__
....
10~~~
10
11
16
16
1
Page 17
8
7
6
3
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