🔎 Mercury 3.3 Reference Library — Exploded parts diagrams (14 diagrams), specifications, common issues, and maintenance checklist.
The Mercury 3.3 is a 2-Stroke, 1-Cylinder outboard motor. Designed for dinghies, inflatable boats, and small tenders where lightweight portability is essential.
Quick Reference Specifications
| Specification |
Value |
| Engine Type |
2-Stroke, 1-Cylinder |
| Horsepower |
3 HP |
| Displacement |
74.6 cc |
| Bore x Stroke |
47 mm x 43 mm |
| Spark Plug (Type & Gap) |
NGK BPR6HS-10 |
| Engine Oil Capacity |
Pre-mix (50:1) |
| Recommended Engine Oil |
Quicksilver Premium 2-Cycle TC-W3 |
| Gear Case Oil Capacity |
— |
| Idle Speed (in gear) |
— |
| Full Throttle RPM Range |
4500-5500 |
| Fuel |
Unleaded Gasoline, 87 Octane min. |
Always verify specifications against your owner's manual for your specific serial number range.
Common Issues & Recommended Parts
Below are common maintenance scenarios for the Mercury 3.3:
-
Water Pump / Overheating: If the tell-tale stream is weak or absent, the water pump impeller likely needs replacement. Inspect annually or every 100 hours. → Recommended: Water Pump Impeller Kit
-
Engine Oil / Maintenance Light: 4-stroke engines require regular oil and filter changes. Use marine-grade oil rated for your engine. Change every 100 hours or annually. → Recommended: Oil Filter, Engine Oil
-
Fuel Injector Issues (EFI models): Rough idle or misfires may indicate clogged fuel injectors. Use fuel stabilizer and clean injectors periodically. → Recommended: Fuel Injector, Fuel Filter
-
Gear Case Oil Leak: Check lower unit seals if gear oil appears milky (water contamination). Replace seals and gaskets during lower unit service. → Recommended: Lower Unit Seal Kit, Drain Plug Gaskets
-
Anode Corrosion: Inspect sacrificial anodes regularly, especially in saltwater. Replace when 50% depleted to protect against galvanic corrosion. → Recommended: Zinc/Aluminum Anode Kit
Parts Diagrams & OEM Part Numbers
Expand the sections below to view detailed exploded parts diagrams and find the exact OEM replacement components for your Mercury 3.3.
▶CD Ignition (17 parts)
| Ref |
OEM Part # |
Part Name |
| - |
262-822899A1 |
FLYWHEEL MAGNETO ASSEMBLY |
| 1 |
262-822899 |
FLYWHEEL |
| 2 |
823030T1 |
COIL, Exciter |
| 3 |
10-16059 |
SCREW |
| 4 |
11-95233 |
NUT |
| 5 |
10-823031 |
SCREW |
| 6 |
823033 |
COIL, Ignition |
| 7 |
10-16705 |
BOLT |
| 8 |
823034T |
CD UNIT |
| 9 |
12-953921 |
WASHER, Stainless Steel |
| 10 |
10-16832 |
BOLT, (M6 x 16) |
| 11 |
12-953921 |
WASHER, Stainless Steel |
| 12 |
33-19796 |
SPARK PLUG Comment: NGK#BPR6HS-10-With Resistance |
| 13 |
85-855543 |
BOOT, With Resistance |
| 14 |
87-823037A04 |
SWITCH ASSEMBLY, Emergency Stop |
| 15 |
823054 |
LANYARD |
| 16 |
54-160601 |
CLAMP |
▶Carburetor (43 parts)
| Ref |
OEM Part # |
Part Name |
| - |
76,8M0080064 |
MAIN JET, Comment: 3.3, High altitude |
| 1 |
1300-8M0203718 |
CARBURETOR ASSEMBLY Comment: 3.3 Horsepower |
| 2 |
95252 |
WIRE, Throttle |
| 3 |
10-95321 |
BOLT |
| 4 |
95253 |
BRACKET |
| 5 |
95254 |
CAP |
| 6 |
24-95322 |
SPRING |
| 7 |
95255 |
PLATE |
| 8 |
53-95323 |
E RING |
| 9 |
8151263 |
JET NEEDLE |
| 10 |
952572 |
VALVE, Throttle Comment: 3.3 Horsepower |
| 11 |
8151081 |
NEEDLE JET |
| 12 |
27-95324 |
GASKET |
| 13 |
95259 |
FLOAT |
| 14 |
95260 |
FLOAT BOWL |
| 15 |
952621 |
HINGE |
| 16 |
17-95327 |
PIN, Hinge |
| 17 |
86,8150293 |
MAIN JET |
| 18 |
10-953251 |
SCREW, Drain |
| 19 |
27-95326 |
GASKET |
| 20 |
952631 |
NEEDLE VALVE |
| 21 |
8M0171808 |
SEAT, Needle Valve |
| 22 |
10-95328 |
SCREW |
| 23 |
24-95329 |
SPRING |
| 24 |
95266 |
LEVER, Shutter |
| 25 |
10-95331 |
SCREW |
| 26 |
95265 |
PLATE, Choke |
| 27 |
13-400256 |
LOCKWASHER, (M6) |
| 28 |
11-95330 |
NUT |
| 29 |
54-95332 |
CLAMP |
| 30 |
10-95333 |
SCREW |
| 31 |
25-811601 |
O-RING |
| 32 |
10-815071 |
SCREW |
| 33 |
95268 |
LEVER, Throttle |
| 34 |
10-815072 |
SCREW |
| 35 |
13-95238 |
LOCKWASHER |
| 36 |
27-95336 |
GASKET |
| 37 |
952672 |
BRACKET |
| 38 |
23-952867 |
COLLAR |
| 39 |
95269 |
KNOB |
| 40 |
10-95338 |
SCREW |
| 41 |
8M0058621 |
COVER Comment: 3.3 Horsepower SN# 1B575753 & Up |
| 42 |
10-95339 |
SCREW |
▶Cowl and Fuel Tank, 1B575522 and Below (28 parts)
| Ref |
OEM Part # |
Part Name |
| 1 |
2189-815098A4 |
TOP COWL ASSEMBLY Comment: Silver |
| 2 |
2189-824926A1 |
BOTTOM COWL, Port |
| 3 |
100-8M0145391 |
BOTTOM COWL, Starboard |
| 4 |
8M0114258 |
LATCH KIT |
| 5 |
17-825829 |
RIVET |
| 6 |
10-16827 |
SCREW |
| 7 |
8M0148363 |
COVER |
| 8 |
815105 |
HINGE, Rear |
| 9 |
10-95386 |
BOLT |
| 10 |
95280 |
PLATE |
| 11 |
11-95385 |
NUT |
| 12 |
25-95387 |
GROMMET |
| 13 |
1258-824963A03 |
TANK ASSEMBLY, Fuel |
| 14 |
36-8M0060029 |
CAP |
| 15 |
27-8M0065762 |
GASKET |
| 16 |
25-815109 |
SEAL |
| 17 |
10-803858 |
BOLT |
| 18 |
13-16818 |
LOCKWASHER |
| 19 |
12-95392 |
WASHER |
| 20 |
23-95390 |
SPACER |
| 21 |
22-95393 |
VALVE |
| 22 |
32-8M0057113 |
LINE, Fuel (1000 mm) |
| 23 |
54-95395 |
CLIP, Stainless Steel |
| 24 |
91-95399 |
TOOL KIT |
| 25 |
17-815111Q02 |
SHEAR PIN, Stainless Steel |
| 26 |
18-95295 |
COTTER PIN |
| 27 |
37-804660A06 |
DECAL, EPA Label Information |
| 28 |
37-8240857 |
DECAL, Fuel Lever |
▶Cowl and Fuel Tank, 1B575523 and Up (28 parts)
| Ref |
OEM Part # |
Part Name |
| 1 |
2189-8M0046051 |
TOP COWL ASSEMBLY Comment: Silver |
| 2 |
100-8M0145392 |
BOTTOM COWL, Port |
| 3 |
100-8M0145391 |
BOTTOM COWL, Starboard |
| 4 |
8M0114258 |
LATCH KIT |
| 5 |
17-825829 |
RIVET |
| 6 |
10-16827 |
SCREW |
| 7 |
8M0148363 |
COVER |
| 8 |
815105 |
HINGE, Rear |
| 9 |
10-95386 |
BOLT |
| 10 |
95280 |
PLATE |
| 11 |
11-95385 |
NUT |
| 12 |
25-95387 |
GROMMET |
| 13 |
1258-824963A03 |
TANK ASSEMBLY, Fuel |
| 14 |
36-8M0060029 |
CAP |
| 15 |
27-8M0065762 |
GASKET |
| 16 |
25-815109 |
SEAL |
| 17 |
10-803858 |
BOLT |
| 18 |
13-16818 |
LOCKWASHER |
| 19 |
12-95392 |
WASHER |
| 20 |
23-95390 |
SPACER |
| 21 |
22-95393 |
VALVE |
| 22 |
32-8M0057113 |
LINE, Fuel (1000 mm) |
| 23 |
54-95395 |
CLIP, Stainless Steel |
| 24 |
91-95399 |
TOOL KIT |
| 25 |
17-815111Q02 |
SHEAR PIN, Stainless Steel |
| 26 |
18-95295 |
COTTER PIN |
| 27 |
37-804660A06 |
DECAL, EPA Label Information |
| 28 |
37-8240857 |
DECAL, Fuel Lever |
▶Crankshaft and Piston (19 parts)
| Ref |
OEM Part # |
Part Name |
| - |
27-8M0203727 |
GASKET SET, Powerhead Comment: 3.3 Horsepower |
| 1 |
474-822892T02 |
CRANKSHAFT ASSEMBLY Comment: 3.3 Horsepower |
| 2 |
NSS |
NOT SOLD SEPARATE, Crankshaft |
| 3 |
NSS |
NOT SOLD SEPARATE, Crankshaft |
| 4 |
629-813269 |
CONNECTING ROD |
| 5 |
31-813270 |
BEARING |
| 6 |
813271001 |
PIN, Crank |
| 7 |
31-95227 |
BEARING, Roller |
| 8 |
28-95229 |
KEY |
| 9 |
30-898101936 |
BEARING, Ball |
| 10 |
95230 |
PLATE |
| 11 |
26-95232 |
SEAL, Oil |
| 12 |
30-822894 |
BEARING, Ball Comment: 3.3 Horsepower |
| 13 |
26-822897 |
SEAL, Oil Comment: 3.3 Horsepower |
| 14 |
822896 |
THRUST PLATE, Lower |
| 15 |
779-9183 |
PISTON Comment: .5MM Oversize-Bare Piston |
| 16 |
39-95309 |
RING, Piston Comment: .5MM Oversize |
| 17 |
898101917 |
PIN, Piston |
| 18 |
53-952366 |
CLIP |
▶Cylinder Block (20 parts)
| Ref |
OEM Part # |
Part Name |
| - |
27-8M0203727 |
GASKET SET, Powerhead Comment: 3.3 Horsepower |
| 1 |
878-8228871 |
CYLINDER BLOCK/CRANKCASE Comment: 3.3 Horsepower |
| 2 |
17-16119 |
PIN, Dowel |
| 3 |
10-898103167 |
SCREW |
| 4 |
10-95298 |
BOLT |
| 5 |
22-8M0064617 |
CONNECTOR |
| 6 |
32-8M0057112 |
HOSE, Rubber (1 Meter) |
| 7 |
27-95299001 |
GASKET |
| 8 |
979-815062T2 |
CYLINDER HEAD |
| 9 |
10-815063 |
SCREW |
| 10 |
12-809931044 |
WASHER |
| 11 |
34-95226 |
REED VALVE |
| 12 |
34-95304 |
STOP |
| 13 |
10-16067 |
SCREW |
| 14 |
54-813275 |
CLAMP |
| 15 |
27-822889 |
GASKET Comment: 3.3 Horsepower |
| 16 |
26-822891 |
SEAL, Oil Comment: 3.3 Horsepower |
| 17 |
900-8M0091645 |
HEAD Comment: 3.3 Horsepower |
| 18 |
10-82304231 |
BOLT |
| 19 |
952251 |
HEAD Comment: 2.5 Horsepower |
▶Driveshaft Housing and Clamp Brackets (45 parts)
| Ref |
OEM Part # |
Part Name |
| - |
27-8M0203727 |
GASKET SET, Powerhead Comment: 3.3 Horsepower |
| 1 |
1599-825128A1 |
HOUSING ASSEMBLY, Driveshaft Comment: 3.3 Horsepower |
| 2 |
27-95220 |
GASKET |
| 3 |
19-879194296 |
FLUSH PLUG |
| 4 |
27-815076002 |
GASKET |
| 5 |
17-16119 |
PIN, Dowel |
| 6 |
823164 |
CARRYING HANDLE Comment: 3.3 Horsepower |
| 7 |
10-8M0204707 |
SCREW, (M6 x 25) |
| 8 |
11-400212 |
NUT, (M6) Stainless Steel |
| 9 |
25-16117 |
GROMMET Comment: 3.3 Horsepower |
| 10 |
10-82304227 |
BOLT Comment: 2.5 Horsepower |
| 11 |
10-823042 |
BOLT |
| 12 |
95274 |
GRIP |
| 13 |
823162A3 |
HANDLE ASSEMBLY, Steering |
| 14 |
10-40011151 |
SCREW, (M8 x 35) Stainless Steel |
| 15 |
22-95364 |
DAMPER |
| 16 |
3406-8150852 |
CLAMP BRACKET |
| 17 |
10-898101337 |
BOLT |
| 18 |
12-95375 |
WASHER |
| 19 |
11-95374 |
NUT, Nylon |
| 20 |
95278 |
BRACKET |
| 21 |
8M0055576 |
DISTANCE ROD |
| 22 |
13-400256 |
LOCKWASHER, (M6) |
| 23 |
11-400212 |
NUT, (M6) Stainless Steel |
| 24 |
10-16200 |
CLAMP SCREW ASSEMBLY |
| 25 |
12-95379 |
PAD |
| 26 |
3407-9160T1 |
SWIVEL BRACKET |
| 27 |
3407-8112041 |
SWIVEL BRACKET |
| 28 |
10-16830 |
BOLT |
| 29 |
23-95381 |
BUSHING |
| 30 |
10-162061 |
SCREW, Adjusting |
| 31 |
24-953838 |
SPRING |
| 32 |
952791 |
FRICTION PAD |
| 33 |
12-16826 |
WASHER, Stainless Steel |
| 34 |
8150921 |
THRUST ROD |
| 35 |
24-8150931 |
SPRING |
| 36 |
8M0058619 |
STOPPER, Tilt |
| 37 |
815096 |
KNOB |
| 38 |
823826T03 |
HOUSING KIT, Extension Comment: 3.3 Horsepower |
| 39 |
23-811214 |
BUSHING Comment: 3.3 Horsepower |
| 40 |
16121001 |
STOPPER Comment: 3.3 Horsepower |
| 41 |
10-8230427 |
BOLT Comment: 3.3 Horsepower |
| 42 |
16-8230441 |
STUD Comment: 3.3 Horsepower |
| 43 |
11-400212 |
NUT, (M6) Stainless Steel Comment: 3.3 Horsepower |
| 44 |
10-82304232 |
BOLT Comment: 3.3 Horsepower |
▶Engine Gasket Set Components (1 parts)
| Ref |
OEM Part # |
Part Name |
| - |
27-815076002 |
GASKET, Driveshaft Housing |
▶Gear Housing Assembly, 2/2.5 Horsepower (33 parts)
| Ref |
OEM Part # |
Part Name |
| - |
27-8M0082878 |
GASKET SET, Lower Unit |
| 1 |
1668-825122T1 |
GEAR HOUSING ASSEMBLY, Basic |
| 2 |
30-95342 |
BEARING, Ball, Lower |
| 3 |
23-95343 |
SPACER |
| 4 |
30-95344 |
BEARING, Ball, Upper |
| 5 |
53-95345 |
RING, Snap |
| 6 |
97-823913Q |
ANODE |
| 7 |
10-16832 |
BOLT, (M6 x 16) |
| 8 |
22-8M0229353 |
PLUG |
| 9 |
27-95220 |
GASKET |
| 10 |
30-95347 |
BEARING |
| 11 |
30-95344 |
BEARING, Ball |
| 12 |
26-95348 |
SEAL, Oil |
| 13 |
46-952871 |
PUMP, Water |
| 14 |
25-95288 |
O-RING |
| 15 |
47-952892 |
IMPELLER |
| 16 |
825114 |
COVER |
| 17 |
10-167051 |
BOLT, (M6 x 20) |
| 18 |
26-95350 |
SEAL, Oil |
| 19 |
23-95361 |
BUSHING, Lower |
| 20 |
44-95291A1 |
PROPELLER SHAFT, With Bevel Gear |
| 21 |
15-811647A1 |
SHIM |
| 22 |
43-95293 |
GEAR, Pinion |
| 23 |
53-815066 |
RING, Snap |
| 24 |
28-95371 |
KEY |
| 25 |
32-953593 |
TUBE ASSEMBLY, Water Comment: Long |
| 26 |
25-953601 |
GROMMET, Upper |
| 27 |
45-952903 |
DRIVESHAFT, Upper Comment: Long |
| 28 |
45-95369 |
DRIVESHAFT, Lower |
| 29 |
952772 |
PIPE Comment: Long |
| 30 |
17-815111Q02 |
SHEAR PIN, Stainless Steel |
| 31 |
48-815083A02 |
PROPELLER, Plastic (3 x 7.4 x 7) |
| 32 |
18-95295 |
COTTER PIN |
▶Gear Housing Assembly, 3.3 Horsepower (47 parts)
| Ref |
OEM Part # |
Part Name |
| - |
8M0080264 |
REPAIR KIT, Water Pump |
| 1 |
1668-825126T06 |
GEAR HOUSING ASSEMBLY, Basic |
| 2 |
30-95342 |
BEARING, Ball, Lower |
| 3 |
10-82304232 |
BOLT |
| 4 |
22-8M0229353 |
PLUG |
| 5 |
27-95220 |
GASKET |
| 6 |
10-16832 |
BOLT, (M6 x 16) |
| 7 |
97-823913Q |
ANODE |
| 8 |
43-16138 |
GEAR |
| 9 |
23-8104711 |
SPACER |
| 10 |
45-8M0227907 |
DRIVESHAFT Comment: Long |
| 11 |
30-95342 |
BEARING, Ball |
| 12 |
28-16155 |
KEY |
| 13 |
27-898101333 |
GASKET |
| 14 |
26-161621 |
SEAL, Oil |
| 15 |
46-815113T03 |
HOUSING, Lower Water Pump |
| 16 |
17-9521811 |
PIN, Roll - Stainless Steel |
| 17 |
27-161603 |
GASKET |
| 18 |
161591 |
GUIDE PLATE |
| 19 |
27-898101331 |
GASKET |
| 20 |
47-8M0204676 |
IMPELLER |
| 21 |
161571 |
LINER |
| 22 |
46-161561 |
HOUSING, Upper Water Pump |
| 23 |
25-161771 |
O-RING |
| 24 |
25-161781 |
O-RING |
| 25 |
23-161761 |
BUSHING |
| 26 |
25-953611 |
GROMMET |
| 27 |
10-8M0063198 |
BOLT |
| 28 |
12-16826 |
WASHER, Stainless Steel |
| 29 |
13-400256 |
LOCKWASHER, (M6) |
| 30 |
32-953592 |
TUBE, Water Comment: Long |
| 31 |
25-953601 |
GROMMET |
| 32 |
30-16128 |
BEARING, Ball |
| 33 |
15-813277 |
SHIM, (0.15) |
| 34 |
43-812944 |
GEAR |
| 35 |
823050 |
PUSH ROD |
| 36 |
24-176671 |
SPRING |
| 37 |
44-952911 |
PROPELLER SHAFT |
| 38 |
52-823049 |
CLUTCH |
| 39 |
30-95344 |
BEARING, Ball |
| 40 |
26-95348 |
SEAL, Oil |
| 41 |
25-16131 |
O-RING |
| 42 |
825116 |
HOUSING |
| 43 |
10-167051 |
BOLT, (M6 x 20) |
| 44 |
48-815083A02 |
PROPELLER, Plastic (3 x 7.4 x 7) |
| 45 |
17-815111Q02 |
PIN, Brass |
| 46 |
18-95295 |
COTTER PIN |
▶Recoil Starter (17 parts)
| Ref |
OEM Part # |
Part Name |
| 1 |
8M0109575 |
STARTER ASSEMBLY, Recoil |
| 2 |
815067 |
HOUSING, Starter |
| 3 |
24-95284 |
SPRING |
| 4 |
95245 |
SHEAVE, Starter |
| 5 |
95246 |
RATCHET |
| 6 |
24-95315 |
SPRING |
| 7 |
95247 |
COVER |
| 8 |
24-95316 |
SPRING |
| 9 |
95248 |
FRICTION PLATE |
| 10 |
12-95317 |
THRUST WASHER |
| 11 |
53-95318 |
E RING |
| 12 |
50-8M0110703 |
ROPE |
| 13 |
95249 |
HANDLE, Starter |
| 14 |
823039 |
PULLEY |
| 15 |
10-16828 |
BOLT |
| 16 |
10-815068 |
BOLT |
| 17 |
95251 |
PLUG |
▶Service/Support Material (1 parts)
| Ref |
OEM Part # |
Part Name |
| - |
16841Q02 |
FLUSHING ATTACHMENT |
▶Shift Linkage, 3.3 Horsepower (19 parts)
| Ref |
OEM Part # |
Part Name |
| 1 |
8130272 |
LEVER, Shift |
| 2 |
25-161811 |
O-RING |
| 3 |
30-812937 |
STOPPER |
| 4 |
24-813028 |
SPRING |
| 5 |
161841 |
LEVER, Shift Rod |
| 6 |
10-161851 |
SCREW |
| 7 |
823052 |
COVER |
| 8 |
27-823053 |
GASKET |
| 9 |
10-16832 |
BOLT, (M6 x 16) |
| 10 |
11-400212 |
NUT, (M6) Stainless Steel |
| 11 |
161721 |
CLUTCH CAM |
| 12 |
161741 |
CAM ROD Comment: Long |
| 13 |
17-161791 |
PIN |
| 14 |
16190 |
JOINT, Set |
| 15 |
161861 |
SHIFT ROD |
| 16 |
10-8248324 |
SCREW, (M6 x 16) |
| 17 |
12-16335 |
WASHER |
| 18 |
12-8M0108373 |
WASHER, Stainless Steel |
| 19 |
18-8150261 |
COTTER PIN |
▶Tools (1 parts)
| Ref |
OEM Part # |
Part Name |
| 0 |
91-37241 |
PULLER PLATE |
100-Hour / Annual Service Checklist
Regular maintenance keeps your Mercury 3.3 running reliably season after season. Most of these tasks can be performed with basic tools and the factory service manual.
- Replace water pump impeller and inspect wear plate
- Change engine oil and oil filter (check drain plug washer)
- Replace spark plugs and check ignition timing
- Drain and refill lower unit gear oil; inspect for water contamination
- Inspect fuel lines, primer bulb, and fuel filter for deterioration
- Check and replace sacrificial anodes (zinc or aluminum)
- Inspect propeller for damage; check shaft seal and cotter pin
- Check valve clearance (refer to service manual for specifications)
- Lubricate all grease points (steering, tilt tube, shift linkage)
- Inspect control cables and throttle/shift linkage for smooth operation
-
Pro Tip: Always flush the engine with fresh water after saltwater use — even a quick 10-minute flush significantly extends component life.
-
Pro Tip: Use fuel stabilizer in the tank before winter storage, and fog the cylinders to prevent internal corrosion during extended periods of non-use.
