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Mercury 40, 4 (GNAT 2 CYL.) (7085673 THRU 7146487) Outboard Motor Parts Diagram & Catalog – Free PDF Download

by JLM Marine 30 Apr 2025 0 Comments
Mercury 40, 4 (GNAT 2 CYL.) Outboard Motor Parts Diagram & Catalog – Free PDF Download

BOTTOM COWL

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Below is the parts list for Mercury 40, 4 (GNAT 2 CYL.) BOTTOM COWL:

Mercury 40, 4 (GNAT 2 CYL.) BOTTOM COWL Diagram
Position No. Part Name OEM Number Supersedes
1 BOTTOM COWL (SERIAL #9141798 AND BELOW) 2154-7603
1 BOTTOM COWL (SERIAL #9141799 AND UP) 2154-7603
2 MOLDING, BOTTOM COWL (2" - 6-1/2" - 15") 714933
3 COVER, BOTTOM COWL 70455
4 SCREW, COVER TO BOTTOM COWL (7/16") 10-69079
5 HANDLE, SHIFT SERIAL Comment: #9210545 AND BELOW 86056A1
6 SHAFT, SHIFT Comment: #9210545 AND BELOW 86056A1
7 SCREW, SHIFT HANDLE TO SHAFT (1 3/8") Comment: #9210545 AND BELOW 10-70182
8 LOCKWASHER, SHIFT HANDLE SCREW Comment: #9210545 AND BELOW 13-26994
5 HANDLE, SHIFT SERIAL Comment: #9210546 AND UP 86055T
6 SHAFT, SHIFT Comment: #9210546 AND UP 86056A1
7 SCREW, SHIFT HANDLE TO SHAFT (1 1/4") Comment: #9210546 AND UP 10-69560
8 LOCKWASHER, SHIFT HANDLE SCREW Comment: #9210546 AND UP 13-26996
9 CAM, SHIFT DETENT 66414
10 ROLL PIN, CAM TO SHIFT SHAFT 17-25905
11 BUSHING, SHIFT SHAFT 23-26856
12 "O" RING, SHIFT SHAFT 25-16524
13 ARM, SHIFT 72733
14 SET SCREW, SHIFT ARM (5/16") 10-72734
15 COTTER PIN, SHIFT SHAFT 18-210711
16 SPRING, DETENT 24-39627
17 PLATE, DETENT SPRING 39601
18 SCREW, DETENT SPRING TO BOTTOM COWL (1/2") 10-25764
19 GASKET, DRIVE SHAFT HOUSING/BOTTOM COWL 27-92874
20 TRIM COVER Comment: SERIAL #9141798 AND BELOW 69602
21 SCREW, TRIM COVER TO BOTTOM COWL (1/2") Comment: SERIAL #9141798 AND BELOW 10-37571
21 SCREW, TRIM COVER TO BOTTOM COWL Comment: SERIAL #9141798 AND BELOW 10-75827
22 "E" RING, RETAINER 53-72168
23 RETAINER, STARTER HANDLE Comment: (SERIAL #9190379 AND BELOW) 70393
23 RETAINER, STARTER HANDLE Comment: (SERIAL #9190380 AND UP) 70393
24 PLUG, BOTTOM COWL - FUEL ADAPTOR 19-74258
25 ARM, LATCH CRANK 70462
26 SPRING, LATCH CRANK 24-70459
27 CRANK, FRONT LATCH 75263
28 WAVE WASHER, LATCH HANDLE 13-34632
29 HANDLE, LATCH BOTTOM COWL 92798
30 ROLL PIN, LATCH HANDLE TO CRANK 17-38489
31 STOP, SHIFT ARM 74802
- GASKET SET 27-77586A78

CARBURETOR ASSEMBLY

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Below is the parts list for Mercury 40, 4 (GNAT 2 CYL.) CARBURETOR ASSEMBLY:

Mercury 40, 4 (GNAT 2 CYL.) CARBURETOR ASSEMBLY Diagram
Position No. Part Name OEM Number Supersedes
1 CARBURETOR ASSEMBLY 89977A2
2 RETAINER, JET (.041) 1395-6043
3 GASKET, JET RETAINER (#)
4 FUEL BOWL 1395-8155
5 GASKET, FUEL BOWL (#)
6 FLOAT 1395-5898
7 SPRING, FLOAT 1395-5904
8 PIN, FLOAT (#)
9 SCREEN, FILTER 1395-4805
10 NOZZLE 1395-5900
11 INLET NEEDLE, SEAT AND GASKET (#)
12 GASKET, INLET NEEDLE AND SEAT (#)
14 SHAFT, CHOKE 1395-5896
15 SPRING, CHOKE RETURN 1395-5905
16 VALVE, CHOKE 1395-5897
17 SCREW, VALVE 1395-5902
18 SHAFT, THROTTLE 1395-5894
19 SPRING, THROTTLE RETURN 1395-5903
20 VALVE, THROTTLE 1395-8670
21 NEEDLE, IDLE (#)
22 SPRING, IDLE NEEDLE 1395-6103
23 WELCH PLUG, CARBURETOR (5/16") (#)
23 CUP PLUG, CARBURETOR (#)
23 GASKET SET 1395-5901
23 REPAIR PARTS KIT 1395-6618

CLAMP AND SWIVEL BRACKET ASSEMBLY

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Below is the parts list for Mercury 40, 4 (GNAT 2 CYL.) CLAMP AND SWIVEL BRACKET ASSEMBLY:

Mercury 40, 4 (GNAT 2 CYL.) CLAMP AND SWIVEL BRACKET ASSEMBLY Diagram
Position No. Part Name OEM Number Supersedes
1 CLAMP BRACKET ASSEMBLY (PORT) Comment: WASHER ATTACHED WITH A RETAINING RING. 1479-7291A1
2 CLAMP BRACKET ASSEMBLY (STARBOARD) Comment: WASHER ATTACHED WITH A RETAINING RING. 1478-7289A1
3 THUMB SCREW ASSEMBLY Comment: WASHER ATTACHED WITH A RETAINING RING. 10-70183A1
4 HANDLE, THUMB SCREW Comment: WASHER ATTACHED WITH A RETAINING RING. 70185
5 GROOVE PIN, THUMB SCREW Comment: WASHER ATTACHED WITH A RETAINING RING. 17-70733
6 WASHER, THUMB SCREW Comment: WASHER ATTACHED WITH A RETAINING RING. 12-70184
1 CLAMP BRACKET ASSEMBLY (PORT) Comment: WASHER ATTACHED WITH A SCREW 1479-7291A1
2 CLAMP BRACKET ASSEMBLY (STARBOARD) Comment: WASHER ATTACHED WITH A SCREW 1478-7289A1
3 THUMB SCREW ASSEMBLY Comment: WASHER ATTACHED WITH A SCREW 10-77190A4
4 HANDLE, THUMB SCREW Comment: WASHER ATTACHED WITH A SCREW 78971
5 GROOVE PIN, THUMB SCREW Comment: WASHER ATTACHED WITH A SCREW 17-78970
6 WASHER, THUMB SCREW Comment: WASHER ATTACHED WITH A SCREW 12-73719
6A SCREW, THUMB SCREW WASHER Comment: WASHER ATTACHED WITH A SCREW 10-768042
7 STUD, CLAMP BRACKET Comment: (SERIAL #9213205 AND BELOW) 16-68926
7 SCREW, CLAMP BRACKET Comment: (SERIAL #9213206 AND UP) 10-96917
8 WASHER, CLAMP BRACKET STUD OR SCREW 12-68920
9 NUT, CLAMP BRACKET STUD OR SCREW 11-8M0204726
10 STUD, CLAMP BRACKET 16-68925
11 LOCKWASHER< CLAMP BRACKET STUD 13-26992
12 NUT, CLAMP BRACKET STUD 11-29598
13 TILT PIN ASSEMBLY 17-68929A2
14 COVER, EXHAUST RELIEF Comment: USED ON EARLY MODELS ONLY 71369
15 SCREW, EXHAUST RELIEF COVER (1/2") Comment: USED ON EARLY MODELS ONLY 10-48408
16 SWIVEL BRACKET ASSEMBLY 1477-7400A2
17 SCREW, SWIVEL BRACKET (1 3/8") 10-69067
17A GREASE FITTING, SWIVEL BRACKET 22-8M0169589
17B LUBRICAP, GREASE FITTING 19-77633Q
18 THUMB SCREW ASSEMBLY 10-71105A1
19 TILT LEVER ASSEMBLY Comment: (SERIAL #9141798 AND BELOW) 76110A1
19 TILT LEVER ASSEMBLY Comment: (SERIAL #9141799 AND UP) 76110A1
20 SPRING, TORSION - PORT 24-68932
21 ROD, REVERSE LOCK 68968
22 COTTER PIN, REVERSE LOCK ROD 18-25191
23 LEVER, REVERSE LOCK 68972
24 SPRING, TORSION - STARBOARD 24-73124
25 GREASE FITTING (USED WITH REF. #14) 22-74629
25 GREASE FITTING (NOT USED WITH REF. #14) 22-8M0169589
25A LUBRICAP, GREASE FITTING 19-77633Q
26 SPRING, TILT PIN 24-62143
27 SPACER, REVERSE LOCK ROD 23-75065

CRANKSHAFT, PISTON AND CONNECTING ROD

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Below is the parts list for Mercury 40, 4 (GNAT 2 CYL.) CRANKSHAFT, PISTON AND CONNECTING ROD:

Mercury 40, 4 (GNAT 2 CYL.) CRANKSHAFT, PISTON AND CONNECTING ROD Diagram
Position No. Part Name OEM Number Supersedes
1 CRANKSHAFT 458-5549
2 CONNECTING ROD ASSEMBLY 626-5547A5
3 SCREW, CONNECTING ROD 10-72455
4 TAB WASHER, CONNECTING ROD SCREW 14-72454
5 NEEDLE BEARING, CONNECTING ROD 29-68944
6 LINER ASSEMBLY, CONNECTING ROD - CRANKPIN 68953A1
8 ROLLER BEARING, CONNECTING ROD - PISTON PIN 31-68949
9 PISTON ASSEMBLY 758-8076A2
10 LOCK RING, PISTON 40-68950
11 PISTON RING ASSEMBLY 39-70175A12
12 OIL SEAL, CRANKSHAFT - UPPER 26-30530
13 ROLLER BEARING, CRANKSHAFT - UPPER 31-78099
14 RING, CRANKSHAFT 71841
15 BALL BEARING, CRANKSHAFT - LOWER 30-69389
16 RETAINING RING, BALL BEARING - LARGE 53-68952
17 RETAINING RING, BALL BEARING - SMALL 53-27275
18 OIL SEAL, CRANKSHAFT 26-77494
19 "O" RING, CRANKSHAFT 25-62706
20 COUPLING ASSEMBLY, CRANKSHAFT 70786A1
21 SEAL, COUPLING 26-76266
- GASKET SET 27-77586A78

CYLINDER BLOCK AND CRANKCASE ASSEMBLY

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Below is the parts list for Mercury 40, 4 (GNAT 2 CYL.) CYLINDER BLOCK AND CRANKCASE ASSEMBLY:

Mercury 40, 4 (GNAT 2 CYL.) CYLINDER BLOCK AND CRANKCASE ASSEMBLY Diagram
Position No. Part Name OEM Number Supersedes
1 BLOCK AND CRANKCASE ASS'Y Comment: SERIAL #9210545 AND BELOW 862-7713A2
1 BLOCK AND CRANKCASE ASS'Y Comment: SERIAL #9210546 AND UP 862-7713A2
2 STUD, POWERHEAD (1 3/8") Comment: SERIAL #9210545 AND BELOW 16-56766
2 STUD, POWERHEAD (1 5/8") Comment: SERIAL #9210546 AND UP 16-728091
3 PIN, CYLINDER BLOCK 17-8M0084726 17-85500
5 STUD, REED BLOCK AND CARBURETOR 16-20353
6 PLUG, PIPE - CYLINDER BLOCK 22-56800
7 SCREW, CRANKCASE TO CYLINDER BLOCK (2") 10-70732
8 SCREW, CRANKCASE TO CYLINDER BLOCK (5/8") 10-28635
9 SCREW, CRANKCASE TO CYLINDER BLOCK (1") 10-28667
10 LINER ASSEMBLY, CYLINDER BLOCK 68953A1
12 NEEDLE BEARING, CENTER MAIN 29-71840
13 COVER, EXHAUST MANIFOLD Comment: SERIAL #9210545 AND BELOW 77178
14 GASKET, EXHAUST MANIFOLD COVER Comment: SERIAL #9210545 AND BELOW 27-74392
15 SCREW, EXHAUST MANIFOLD COVER (5/8") Comment: SERIAL #9210545 AND BELOW 10-32228
13 COVER, EXHAUST MANIFOLD Comment: SERIAL #9210546 AND UP 77585
14 GASKET, EXHAUST MANIFOLD COVER Comment: SERIAL #9210546 AND UP 27-77586
15 SCREW, EXHAUST MANIFOLD COVER (5/8") Comment: SERIAL #9210546 AND UP 10-32228
16 COVER, CYLINDER BLOCK 1027-5546
17 GASKET, CYLINDER BLOCK COVER 27-68942
18 SCREW, CYLINDER BLOCK COVER (5/8") 10-32228
19 GASKET, BLOCK TO BOTTOM COWL 27-68941
20 NUT, POWERHEAD STUDS 11-8M0207775
22 HOSE, BLEED 32-9938779
23 FITTING ADAPTOR 22-56759
24 CHECK VALVE ASSEMBLY, CRANKCASE 21-64871A2
25 REED BLOCK 69498
26 GASKET, CRANKCASE TO REED BLOCK 27-70415
27 REED ASSEMBLY 34-69499A1
28 REED STOP 34-69500
29 SCREW, REED AND REED STOP (1/4") 10-28430
30 GASKET, REED BLOCK TO ADAPTOR 27-70416
31 ADAPTOR, CARBURETOR TO REED BLOCK 70420
32 BRACKET, CABLE MOUNTING Comment: (SERIAL #9210595 AND BELOW) 70413
32 BRACKET, CABLE MOUNTING Comment: (SERIAL #9210596 AND UP) 79746
33 SCREW, BRACKET TO ADAPTOR (1/2") 10-69022
34 SCREW, CABLE MOUNTING BRACKET (7/16") 10-20055
35 FILLER BLOCK, REED BLOCK TO CRANKCASE Comment: (EARLY MODELS) 74777
- GASKET SET 27-77586A78

DRIVE SHAFT HOUSING ASSEMBLY

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Below is the parts list for Mercury 40, 4 (GNAT 2 CYL.) DRIVE SHAFT HOUSING ASSEMBLY:

Mercury 40, 4 (GNAT 2 CYL.) DRIVE SHAFT HOUSING ASSEMBLY Diagram
Position No. Part Name OEM Number Supersedes
1 DRIVE SHAFT HOUSING ASSEMBLY Comment: SERIAL #9210595 AND BELOW 1580-6673A2
1 DRIVE SHAFT HOUSING ASSEMBLY Comment: SERIAL #9210596 AND UP 1580-6673A2
2 STUD, DRIVE SHAFT HOUSING (SHORT SHAFT) 16-68927
2 STUD, DRIVE SHAFT HOUSING (LONG SHAFT) 16-75321
3 SCREW, GREASE FILLER 10-79953Q04
4 WASHER, GREASE FILLER SCREW 12-191833
5 WATER TUBE (SHORT SHAFT) 32-68979
5 WATER TUBE (LONG SHAFT) 32-75308
6 SEAL, WATER TUBE 26-36556
7 WASHER, WATER TUBE SEAL 23-13127
8 CLAMP, CO-PILOT 68976
9 MOUNT, RUBBER Comment: DRIVE SHAFT HOUSING (TOP) 88669
9 MOUNT Comment: RUBBER - DRIVE SHAFT HOUSING (BOTTOM) 88669
10 BUSHING, RUBBER MOUNT 23-74308
11 BRACKET ASSEMBLY, STEERING ARM 98496A1
12 SCREW, STEERING ARM BRACKET (1") 10-68918
13 NUT, GEAR HOUSING STUD 11-82670911
13 ADAPTOR, DRIVE SHAFT HOUSING (LONG SHAFT) 75311T
13 BEARING BLOCK, DRIVE SHAFT (LONG SHAFT) 94909

FLYWHEEL, STATOR AND MANUAL STARTER

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Below is the parts list for Mercury 40, 4 (GNAT 2 CYL.) FLYWHEEL, STATOR AND MANUAL STARTER:

Mercury 40, 4 (GNAT 2 CYL.) FLYWHEEL, STATOR AND MANUAL STARTER Diagram
Position No. Part Name OEM Number Supersedes
1 FLYWHEEL ASSEMBLY 247-7933A2
2 KEY, FLYWHEEL DRIVE 28-20094
3 WASHER, FLYWHEEL 12-20553
4 NUT, FLYWHEEL 11-8M0204726
5 STATOR ASSEMBLY 339-5566A5
6 SCREW, STATOR TO MOUNTING BRACKET (7/8") 10-66707
7 COIL ASSEMBLY (2 1/4" AND 4 1/4" LEADS) 339-5589A1
7 COIL ASSEMBLY (3 3/8" AND 4 3/8" LEADS) 339-5590A1
8 CLIP, COIL RETAINING 54-59538
9 CLIP, COIL RETAINING 54-65927
10 TERMINAL BLOCK, STATOR 86-69348
10A LOCKWASHER, TERMINAL BLOCK 13-58308
11 SCREW, LEADS TO TERMINAL BLOCK (3/8") 10-22654
12 SCREW, TERMINAL BLOCK TO STATOR (5/8") 10-69347
13 NUT, TERMINAL BLOCK SCREW 11-46438
14 TRIGGER ASSEMBLY 70426A3
17 LINK ROD, TRIGGER TO SPARK LEVER 70414
18 NUT, ADJUSTING LINK ROD 11-68219
19 SWIVEL BOLT, LINK ROD 33973
20 BRACKET, STATOR MOUNTING 70428
21 SCREW, STATOR MOUNTING BRACKET (7/16") 10-25764
22 LEVER, SPARK 70422
23 SCREW, ADJUSTING - SPARK LEVER (1 1/8") 10-62802
24 NUT, ADJUSTING SCREW 11-21923T
25 SPRING, THROTTLE LEVER 24-70418
26 THROTTLE LEVER 70424
27 THROTTLE CAM 70429
28 SCREW Comment: THROTTLE CAM TO THROTTLE LEVER (5/8") 10-38055
29 WASHER, THROTTLE CAM SCREW (7/8") 12-8M0204666
30 SCREW, SHOULDER (7/8") 10-38515
31 WASHER, SHOULDER SCREW 12-69056
32 SPRING, STARTER REWIND 24-70167
33 BRACKET ASSEMBLY, STARTER REWIND 75764
34 SCREW, BRACKET TO CYLINDER BLOCK (1/2") 10-37571
34A WASHER, BRACKET TO CYLINDER BLOCK SCREW 12-30164
35 STARTER SHEAVE 77568
36 STARTER ROPE ASSEMBLY (INCLUDES 2 RIVETS) 50-90892A2
37 HANDLE, STARTER ROPE 70396
38 CAP, STARTER HANDLE 70394
39 PINION, STARTER REWIND 75764A2
39A WASHER, PINION 12-30164
40 SPRING, PINION 24-70288
41 RETAINER, PINION SPRING 72697
42 SPRING, TORSION - PINION 24-77511
43 HOLDER, SPRING 77512
44 SPACER, SPRING HOLDER Comment: (SERIAL #9189789 AND BELOW) 23-78894
44 SPACER, SPRING HOLDER Comment: (SERIAL #9189790 AND UP) 23-78894
45 SCREW, SPRING RETAINER (5/8") 10-70181
46 WASHER, SPRING RETAINER 12-8M0204666
47 RIVET, STARTER SHEAVE 17-70180

FUEL TANK, FUEL LINES AND CARBURETOR

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Below is the parts list for Mercury 40, 4 (GNAT 2 CYL.) FUEL TANK, FUEL LINES AND CARBURETOR:

Mercury 40, 4 (GNAT 2 CYL.) FUEL TANK, FUEL LINES AND CARBURETOR Diagram
Position No. Part Name OEM Number Supersedes
1 FUEL TANK (SERIAL #9191588 AND BELOW) 1248-6114
1 FUEL TANK (SERIAL #9191589 AND UP) 1248-8083A2
2 SCREW, VENT - FUEL CAP 10-70298
3 WASHER, VENT SCREW 12-8M0204663
4 CAP, FUEL Comment: SERIAL #9191588 AND BELOW 36-75338
5 GASKET, FUEL CAP Comment: SERIAL #9191588 AND BELOW 27-70297
4 CAP, FUEL SERIAL Comment: SERIAL #9191589 AND UP 36-78573A1
5 GASKET, FUEL CAP Comment: SERIAL #9191589 AND UP 27-78577
6 WASHER, FUEL CAP 12-38255
7 SPRING, FUEL CAP 24-22227
8 WASHER, FUEL CAP 12-71055
9 PIN, FUEL CAP - RING 18-210711
10 CHAIN, FUEL CAP 752373
11 SPRING, FUEL CAP - RETAINING Comment: SERIAL #9191588 AND BELOW 24-85767
12 GASKET, FUEL TANK TO COWL Comment: SERIAL #9191588 AND BELOW 27-70554
13 BRACKET, FUEL TANK AND IGNITION COIL Comment: SERIAL #9191588 AND BELOW 73973
11 SPRING, FUEL CAP - RETAINING Comment: SERIAL #9191589 AND UP 24-85767
12 GASKET, FUEL TANK TO COWL Comment: SERIAL #9191589 AND UP 27-78578
13 BRACKET, FUEL TANK AND IGNITION COIL Comment: SERIAL #9191589 AND UP 78579
14 SCREW, BRACKET TO CYLINDER BLOCK (1/2") 10-37571
15 NUT, BRACKET SCREW 11-859124 11-45812
16 STRAP ASSEMBLY, FUEL TANK ATTACHING 75689A1
16A SCREW Comment: STRAP ASSEMBLY TO FUEL TANK BRACKET 10-26668
17 FITTING, FUEL TANK (FILTER) 22-70997
18 CLAMP, FUEL LINE TO FITTING 54-68725
19 FUEL LINE, FUEL TANK TO VALVE (8") 32-8M0108355 32-8M0047428, 32-830756109, 32-99127109, 32-877821
20 CLAMP, FUEL LINE ATTACHING 54-68424
21 VALVE Comment: FUEL SHUT OFF (SERIAL #9191588 AND BELOW) 20-70555
22 FUEL LINE Comment: VALVE TO CARBURETOR (4" AND 1-1/2") 32-8M0108355 32-8M0047428, 32-830756109, 32-99127109, 32-877821 VALVE TO CARBURETOR (4" AND 1-1/2")
23 FITTING, CARBURETOR TO FUEL LINE (90 DEG.) 22-19688
24 CARBURETOR 89977A2
25 GASKET, CARBURETOR MOUNTING 27-70417
26 CHOKE CABLE (ROUND SHOULDER) 70557
26 CHOKE CABLE (SQUARE SHOULDER) 70557
27 SPACER, CHOKE KNOB - INNER Comment: USE WITH ROUND SHOULDERED CHOKE 77999
28 SPACER, CHOKE KNOB - OUTER Comment: USE WITH ROUND SHOULDERED CHOKE 78000
29 NUT, LOCKING - CHOKE CABLE 11-78045
30 KNOB, CHOKE CABLE 86874
31 WASHER, CARBURETOR STUD 12-8M0204649
32 NUT, CARBURETOR STUD 11-36069
33 FUEL FILTER 35-76934
34 LEVER, IDLE ADJUSTMENT 78049
35 LINK, IDLE ADJUSTMENT 78046
36 SHAFT, IDLE ADJUSTMENT 78048
38 SLEEVE, IDLE ADJUSTMENT 23-78047
40 NUT, CHOKE KNOB 11-78045
41 KNOB, CHOKE 92434A2
41 BRACKET, FUEL TANK (LONG SHAFT) 76623
- GASKET SET 27-77586A78
- GASKET SET 27-77586A78

GEAR HOUSING ASSEMBLY (DRIVE SHAFT)

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Below is the parts list for Mercury 40, 4 (GNAT 2 CYL.) GEAR HOUSING ASSEMBLY (DRIVE SHAFT):

Mercury 40, 4 (GNAT 2 CYL.) GEAR HOUSING ASSEMBLY (DRIVE SHAFT) Diagram
Position No. Part Name OEM Number Supersedes
GEAR HOUSING ASS'Y, COMP. (SHORT SHAFT) Comment: SERIAL #9210545 AND BELOW 1648-7811A20
GEAR HOUSING ASS'Y, COMP. (LONG SHAFT) Comment: SERIAL #9210545 AND BELOW 1648-7811A21
GEAR HOUSING ASS'Y, COMP. (SHORT SHAFT) Comment: SERIAL #9210546 AND UP 1648-7811A20
GEAR HOUSING ASS'Y, COMP. (LONG SHAFT) Comment: SERIAL #9210546 AND UP 1648-7811A21
1 GEAR HOUSING ASSEMBLY, BASIC 1648-7381A1
2 STUD, GEAR HOUSING (2 1/8") - SHORT SHAFT 16-68927
2 STUD, GEAR HOUSING (7 1/4") - LONG SHAFT 16-75321
3 STUD, WATER PUMP (2 1/4') 16-68928
4 STUD, WATER PUMP (1 1/2") 16-70741
5 ROLLER BEARING, GEAR HOUSING - LOWER 31-23101
6 COUPLING, DRIVE SHAFT/PINION 68978
7 ROLLER BEARING, GEAR HOUSING - UPPER 31-69496
8 PINION GEAR 43-68981
9 THRUST BEARING, PINION GEAR 31-68945
10 WASHER, THRUST BEARING 12-71557
11 DRIVE SHAFT (SHORT SHAFT) 45-68983
11 DRIVE SHAFT (LONG SHAFT) 45-75310
11 DRIVE SHAFT (LONG SHAFT) 45-75310
12 KEY, IMPELLER DRIVE 28-8M0032835 28-56655
13 GASKET, WATER PUMP - LOWER 27-68939
14 WATER PUMP HOUSING ASSEMBLY 46-90844A1
15 OIL SEAL, WATER PUMP 26-897153 26-96063
16 INSERT, WATER PUMP 70977T
17 WASHER, WATER PUMP 12-8M0204666
18 QUAD SEAL, WATER PUMP 25-74138
19 IMPELLER 47-89980
20 FACE PLATE, WATER PUMP 68955
21 WATER PUMP COVER ASSEMBLY 46-95965A2
22 OIL SEAL, WATER PUMP COVER 26-30913
23 WASHER, WATER TUBE SEAL 23-13127
24 SEAL, WATER TUBE 26-36558
24A SLEEVE, WATER TUBE GUIDE 23-31792T
25 RING, RUBBER - DRIVE SHAFT 25-30526
26 WASHER, WATER PUMP STUDS 12-30164
27 NUT, WATER PUMP STUDS 11-859124 11-45812
28 SHIFT SHAFT (SHORT SHAFT) 72418T
28 SHIFT SHAFT (LONG SHAFT) 75307
29 SCREW, VENT - GEAR HOUSING (1/4") 10-28653
30 WASHER, VENT SCREW 19643
31 SCREW, GREASE FILLER 10-79953Q04
32 WASHER, GREASE FILLER SCREW 12-191833
- GASKET SET 27-77586A78

GEAR HOUSING ASSEMBLY (PROPELLER SHAFT)

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Below is the parts list for Mercury 40, 4 (GNAT 2 CYL.) GEAR HOUSING ASSEMBLY (PROPELLER SHAFT):

Mercury 40, 4 (GNAT 2 CYL.) GEAR HOUSING ASSEMBLY (PROPELLER SHAFT) Diagram
Position No. Part Name OEM Number Supersedes
GEAR HOUSING ASS'Y, COMP. (SHORT SHAFT) Comment: SERIAL #9210545 AND BELOW 1648-7811A20
GEAR HOUSING ASS'Y, COMP. (LONG SHAFT) Comment: SERIAL #9210545 AND BELOW 1648-7811A21
GEAR HOUSING ASS'Y, COMP. (SHORT SHAFT) Comment: SERIAL #9210546 AND UP 1648-7811A20
GEAR HOUSING ASS'Y, COMP. (LONG SHAFT) Comment: SERIAL #9210546 AND UP 1648-7811A21
1 GEAR HOUSING ASSEMBLY 1648-7381A1
33 NUT, PROPELLER SHAFT 11-20696
34 WASHER, PROPELLER SHAFT 12-73672
35 DRIVE GEAR 43-68980
36 SPRING, CLUTCH 24-91813
37 SHIM ASSEMBLY, BALL BEARING 15-69516A1
38 BALL BEARING, DRIVE GEAR 30-70894
39 NUT, DRIVE GEAR 11-69515
40 PROPELLER SHAFT 44-68982
41 SPACER, PROPELLER SHAFT Comment: SERIAL #9210545 AND BELOW 69517
42 BEARING CARRIER ASSEMBLY Comment: SERIAL #9210545 AND BELOW 99210A2
43 ROLLER BEARING Comment: SERIAL #9210545 AND BELOW 31-21145
44 OIL SEAL Comment: SERIAL #9210545 AND BELOW 26-98309
45 COVER, GEAR HOUSING Comment: SERIAL #9210545 AND BELOW 68956
41 SPACER, PROPELLER SHAFT Comment: SERIAL #9210546 AND UP 75816
42 BEARING CARRIER ASSEMBLY Comment: SERIAL #9210546 AND UP 99210A1
44 OIL SEAL Comment: SERIAL #9210546 AND UP 26-98309
45 COVER, GEAR HOUSING Comment: SERIAL #9210546 AND UP 75812
46 "O" RING, BEARING CARRIER 25-68935
47 KEY, BEARING CARRIER 28-32003
48 WASHER, GEAR HOUSING COVER Comment: SERIAL #9141798 AND BELOW 12-68923
49 THRUST HUB, FORWARD 70588
50 PROPELLER ASSEMBLY 48-86903A1
51 THRUST HUB, AFT 70589
52 NUT, PROPELLER 11-82670911
53 NUT, DRIVE SHAFT HOUSING STUD 11-82670911
- GASKET SET 27-77586A78

MISCELLANEOUS PARTS/ACCESSORIES

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Below is the parts list for Mercury 40, 4 (GNAT 2 CYL.) MISCELLANEOUS PARTS/ACCESSORIES:

Mercury 40, 4 (GNAT 2 CYL.) MISCELLANEOUS PARTS/ACCESSORIES Diagram
Position No. Part Name OEM Number Supersedes
- MERC 4 PARTS MANUAL 90-74059
- DECAL SET (SERIAL #9141798 AND BELOW) 37-89319A80
- DECAL SET (SERIAL #9141798 THRU #9172805) 37-89319A80
- DECAL SET (SERIAL #9172805 THRU #9208225) 37-89319A80
- GASKET SET (SERIAL #9208226 AND UP) 37-89319A80
- GASKET SET (SERIAL #9210545 AND BELOW) Comment: . 27-77586A78
- GASKET SET (SERIAL #9210546 AND UP) 27-77586A78
- FUEL PUMP KIT (REMOTE FUEL TANK) 87905A5
- CONVERSION KIT Comment: (SHORT SHAFT TO LONG SHAFT) 75311A1

STEERING HANDLE ASSEMBLY

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Below is the parts list for Mercury 40, 4 (GNAT 2 CYL.) STEERING HANDLE ASSEMBLY:

Mercury 40, 4 (GNAT 2 CYL.) STEERING HANDLE ASSEMBLY Diagram
Position No. Part Name OEM Number Supersedes
1 BOOT ASSEMBLY, HANDLE 11099A1
2 GRIP, HANDLE 70382
3 ARM, HANDLE 70383
4 WASHER, HANDLE 12-31433
5 RETAINING RING, HANDLE 53-70384
6 PULLEY, STEERING CABLE 70386
7 SHAFT, HANDLE 70385
7A HARNESS ASSEMBLY, STOP SWITCH 84-70671A1
8 BRACKET ASSEMBLY, HANDLE 70389A2
9 SCREW, HANDLE BRACKET (3/4") 10-37978
10 RETAINER, CABLE 70390
11 INSULATOR, CABLE 85-708571
12 BUSHING, HANDLE BRACKET 23-70391
13 NUT, HANDLE BRACKET 11-73784
14 CABLE, THROTTLE ADVANCE 92791
15 CABLE, THROTTLE RETARD 92791
16 NUT, THROTTLE CABLE 11-21825
17 WASHER, THROTTLE CABLE 12-37998
18 SLEEVE, STOP SWITCH HARNESS 32-9912688

SWITCH BOX AND IGNITION COIL

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Below is the parts list for Mercury 40, 4 (GNAT 2 CYL.) SWITCH BOX AND IGNITION COIL:

Mercury 40, 4 (GNAT 2 CYL.) SWITCH BOX AND IGNITION COIL Diagram
Position No. Part Name OEM Number Supersedes
1 SWITCH BOX ASSEMBLY 339-6222A8
2 SCREW, SWITCH BOX GROUND (3/8") 10-45218
3 SCREW, SWITCH BOX (3/4") 10-22523
3A SPACER, SWITCH BOX SCREW (EARLY MODELS) 23-26731
4 WASHER, SWITCH BOX SCREW 12-8M0204666
5 "J" CLIP, SWITCH BOX LEAD 54-63153
6 WIRE, HIGH TENSION 84-813715A1
6 SPARK PLUG (USE IN BELGIUM AND CANADA) 33-813472
7 SPARK PLUG (USE IN UNITED STATES) 33-813472
8 IGNITION COIL ASSEMBLY 300-8M0166172
10 NUT, IGNITION COIL TERMINAL 11-45076
11 COIL COVER 76254
12 SCREW, COIL COVER (1 7/8") 10-76502
13 STA-STRAP, SWITCH BOX LEADS 61990
14 SLEEVE, SWITCH BOX LEADS 5790811

TOP COWL

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Below is the parts list for Mercury 40, 4 (GNAT 2 CYL.) TOP COWL:

Mercury 40, 4 (GNAT 2 CYL.) TOP COWL Diagram
Position No. Part Name OEM Number Supersedes
1 TOP COWL (SERIAL #9191588 AND BELOW) Comment: DOES NOT INCLUDE DECALS 2155-5673
1 TOP COWL (SERIAL #9191589 AND UP) Comment: DOES NOT INCLUDE DECALS 2155-6654
2 HOOK, TOP COWL - REAR 74139
3 SCREW, HOOK TO COP COWL (3/8") 10-45742
4 NUT, HOOK SCREW 11-8M0204718
5 CATCH, TOP COWL - FRONT 70461
6 SCREW, CATCH TO COP COWL (3/4") 10-69570
7 SOUND BOX (SERIAL #9141798 AND BELOW) 78634
7 SOUND BOX (SERIAL #9141799 AND UP) 78634
7A PLUG, SOUND BOX 22-390721
8 SCREW, SOUND BOX TO CARBURETOR (1/2") 10-52195
9 WASHER, SOUND BOX SCREW 12-20192
10 GASKET, SOUND BOX Comment: NOT USED ON LATER MODELS 27-70289
11 COVER, SOUND BOX Comment: NOT USED ON LATER MODELS 70292
12 PLUG, SOUND BOX Comment: NOT USED ON LATER MODELS 19-824928001 19-824928, 19-32297 NOT USED ON LATER MODELS
13 SCREW, COVER TO SOUND BOX (1/2") Comment: NOT USED ON LATER MODELS 10-95700
14 SCREW, SOUND BOX TO COVER (1") 10-72415

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For Mercury Owners:

To assist you in maintaining and repairing your marine engines, we hope the following resources may be of use:

About JLM Marine

Founded in 2002, JLM Marine has established itself as a dedicated manufacturer of high-quality marine parts, based in China. Our commitment to excellence in manufacturing has earned us the trust of top marine brands globally.

As a direct supplier, we bypass intermediaries, which allows us to offer competitive prices without compromising on quality. This approach not only supports cost-efficiency but also ensures that our customers receive the best value directly from the source.

We are excited to expand our reach through retail channels, bringing our expertise and commitment to quality directly to boat owners and enthusiasts worldwide.

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