Mercury 15 (4-STROKE) (0P075166 THRU 0P400999) Parts & Diagrams

🔎 Mercury 15 (4-STROKE) Reference Library — Exploded parts diagrams (31 diagrams), specifications, common issues, and maintenance checklist.

The Mercury 15 (4-STROKE) is a 4-Stroke, Inline 2-Cylinder, EFI, SOHC outboard motor. A popular choice for small fishing boats, inflatable RIBs, and sailboat auxiliaries.

Quick Reference Specifications

Specification	Value
Engine Type	4-Stroke, Inline 2-Cylinder, EFI, SOHC
Horsepower	15 HP
Displacement	333 cc
Bore x Stroke	61 mm x 57 mm
Spark Plug (Type & Gap)	NGK DCPR6E
Engine Oil Capacity	1.0 L (1 quart)
Recommended Engine Oil	SAE 25W-40 Synthetic Blend Mercury FC-W
Gear Case Oil Capacity	200 mL (6.8 fl oz)
Idle Speed (in gear)	850 ± 50 RPM (in gear)
Full Throttle RPM Range	5000-6000
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 15 (4-STROKE):

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 15 (4-STROKE).

▶Accessories (1 parts)

Ref	OEM Part #	Part Name
0	856556A2	SWITCH KIT, Tiller Handle Start Button

▶Bottom Cowl (23 parts)

Ref	OEM Part #	Part Name
1	4000-835416A1	BOTTOM COWL Comment: (Black)
2	25-857002	COVER
3	852480	LATCH HOOK
4	10-4006731	SCREW, (M6 x 16)
5	12-8M0214930	WASHER
6	23-826618	BUSHING
7	25-828129	GROMMET
8	12-69057	WASHER, (.281 x .734 x .063)
9	25-855289T	GROMMET
10	825782F1	LEVER, Cowl Latch Comment: (Black)
11	10-1993735	SCREW, (M6 x 35 MM)
12	23-812707	BUSHING
13	13-12134	WASHER, Wave
14	22-8M0182334	CONNECTOR, Fuel - Brass
15	10-40011129	SCREW, (M6 x 25) Stainless Steel
16	25-18202	GROMMET, Fuel Connector
17	54-816311T	TIE STRAP, (8.00 Inches)
18	32-9912878	HOSE, (.187) (26.00 Inches Bulk) Comment: (Cut to 21 Inch Length) SN# 0T003861 & Below
19	826037	PLUG
20	22-813613	FITTING
21	54-816311T	TIE STRAP, (8.00 Inches)
22	NSS	NOT SOLD SEPARATE, Decal Unleaded Fuel Comment: (Bodensee)
23	37-111851	SHIFT DECAL Comment: (Handle) (Use Where Applicable)

▶Carburetor (42 parts)

Ref	OEM Part #	Part Name
-	802706A1	REPAIR KIT, Carburetor
1	3323-835382T04	CARBURETOR Comment: (13.5/15) (With Tamper Cap)
2	10-809571	SCREW, (M4 x 10)
3	8095721	COVER
4	809573	GASKET
5	10-8095781	SCREW, Throttle
6	24-8095791	SPRING
7	10-811248M	SCREW, (M4 x 5)
8	802705	COVER
9	10-8026921	SCREW, (M3 x 5)
10	45,8027011	PILOT JET,
11	19-802702	PLUG
12	8027002	MAIN NOZZLE Comment: (8/9.9)
13	25-11802M	O-RING
14	68,8027013	JET, Main Comment: (8/9.9)
15	10-8095711	SCREW, (M4 x 5)
16	8095701	VALVE, Needle
17	809569	FLOAT
18	17-11794M	PIN
19	27-802699	GASKET
20	35-802704	FILTER
21	802690T2	FLOAT BOWL ASSEMBLY Comment: (8/9.9)
22	53-802693	RING, Retaining Comment: (13.5/15)
23	802698	CAP Comment: (13.5/15)
24	802697	SEAL Comment: (13.5/15)
25	802695	DIAPHRAGM Comment: (13.5/15)
26	24-802696	SPRING Comment: (13.5/15)
27	802694	PLATE Comment: (13.5/15)
28	10-802692	SCREW, (M4 x 8) Comment: (13.5/15)
29	22-14183M	PLUG, Drain (M4 x 5) Comment: (13.5/15)
30	27-8026911	GASKET Comment: (13.5/15)
31	10-8095783	SCREW, Drain (M5 x 6) Comment: (Not Included With 8/9.9 Bowl)
32	27-802691	GASKET Comment: (Not Included With 8/9.9 Bowl)
33	10-81758M	SCREW, (M4 x 12)
34	21-802703	CHECK VALVE Comment: (13.5/15)
35	NSS	NOT SOLD SEPARATE, Spring-Air Adjusting
36	NSS	NOT SOLD SEPARATE, O-Ring
37	NSS	NOT SOLD SEPARATE, Screw-Air Adjusting
38	19-855237	PLUG
39	26-827737	SEAL, Rubber Comment: (Bodensee)
40	859200	STOP, Throttle Comment: (8 Bodensee)
41	11-821285	PUSH NUT Comment: (8 Bodensee)

▶Clamp Bracket (35 parts)

Ref	OEM Part #	Part Name
1	1497-8796A7	BRACKET ASSEMBLY, Transom Comment: (Starboard) (Black)
2	1497-8794A9	BRACKET ASSEMBLY, Transom Comment: (Port) (Black)
3	10-92767A3	THUMB SCREW ASSEMBLY, (16 mm) Comment: (3.68)
4	NSS	NOT SOLD SEPARATE, Rivet
5	NSS	NOT SOLD SEPARATE, Handle
6	10-768042	SHOULDER SCREW, Hex
7	12-73719	WASHER, Thumb Screw
8	11-826709109	NUT, (.250-28) Stainless Steel
9	11-93164	NUT, (.875)
10	10-4000333	SCREW, (M6 x 40)
11	41042	HANDLE, Carrying
12	23-818538	SPACER
13	12-71421	WASHER, Nylon, Tilt Tube
14	8M0035075	TILT TUBE
15	12-71421	WASHER, Nylon, Tilt Tube
16	37-8237011	DECAL, Co-Pilot Comment: (Handle Models)
17	17-56373A2	PIN ASSEMBLY, Tilt
18	24-92995	SPRING
19	10-4000333	SCREW, (M6 x 40)
20	11-93164	NUT, (.875)
21	54-8M0085928	CLIP, Safety
22	10-814945	SCREW, (.312-18 x 3.500) Stainless Steel
23	12-67981	WASHER
24	11-815848	NUT, (.312)
25	11-826709109	NUT, (.250-28) Stainless Steel
26	10-41523	SCREW, (.250-28 x 1.00)
27	96965	LEVER, Tilt Stop-Starboard Side
28	11-826709109	NUT, (.250-28) Stainless Steel
29	24-44581	SPRING, Tilt Stop Lever Screw
30	10-41524	SCREW, (.250-28 x 1.75)
31	10-41524	SCREW, (.250-28 x 1.75)
32	13-31030	WAVE WASHER, Tilt Stop Strap Screw
33	11-826709109	NUT, (.250-28) Stainless Steel
34	90901	STRAP, Tilt Stop-Port Side
35	10-41523	SCREW, (.250-28 x 1.00)

▶Crankshaft, Pistons, And Connecting Rods (16 parts)

Ref	OEM Part #	Part Name
-	27-835427A00	GASKET SET, Powerhead
1	400-834957	CRANKSHAFT
2	26-855680	SEAL, Oil
3	26-855681	SEAL, Oil
4	31-83496020	BEARING Comment: (Blue)
5	600-834961T1	CONNECTING ROD
6	10-850844	BOLT, (M7 x 38)
7	12-855682	WASHER
8	700-834963T	PISTON
9	39-850846	RING, Piston
10	39-850847	RING, Piston
11	39-825839	RING, Oil
12	41-825713	PIN, Piston
13	53-82343M	CLIP
14	28-8M0057164	KEY Comment: SN# USA-0T801000/BEL-0P268000 & Up
15	28-8M0084803	KEY

▶Cylinder Block and Covers (47 parts)

Ref	OEM Part #	Part Name
-	27-835427A00	GASKET SET, Powerhead
1	900-8M0055024	CYLINDER BLOCK
2	17-825689	PIN, Dowel
3	10-8M0101617	BOLT, (M8 x 55)
4	10-43092M	BOLT, (M6 x 14)
5	22-822644	PIPE PLUG
6	27-834952002	GASKET
7	834953T02	COVER, Exhaust
8	22-83326M	FITTING
9	855676A1	THERMOSTAT, (60C/140F) Comment: SN# USA-0T980000/BEL-0P325500 & Up
10	8M0188835	COVER, Thermostat
11	27-8M0177107	GASKET
12	10-82500930	BOLT, (M6 x 30)
13	8M0060022	HOSE
14	54-888441	CLAMP, Oetiker (12.8 mm) Comment: SN# USA-0T801000/BEL-0P268000 & Up
15	32-8M0108355	HOSE, (57.00 Inches Bulk), To Telltale Comment: (Cut to 16 Inch Length) SN# USA-0T003861 & Below
16	35-8M0162832	FILTER ASSEMBLY, Oil Comment: SN# USA-0T801000/BEL-0P268000 & Up
17	822625	NIPPLE, (M20)
18	25-855690	GROMMET
19	834974	BREATHER COVER
20	26-850850	SEAL
21	10-8257021	BOLT, (M6 x 20)
22	855922A2	PLATE, Oil Deflection Comment: SN# USA-0G960500 & Up
23	27-8354272	GASKET Comment: SN# USA-0G960500 & Up
24	855922A2	PLATE, Oil Deflection Comment: SN# USA-0G960499 & Below
25	27-8354271	GASKET Comment: SN# USA-0G960500 & Below
26	10-40011151	SCREW, (M8 x 35) Stainless Steel
27	12-4002317	WASHER
28	97-8M0099896	ANODE
29	25-825040	GROMMET
30	855776	COVER
31	10-855778	BOLT, (M5 x 12)
32	855779	PLATE
33	10-8257021	BOLT, (M6 x 20)
34	8533442	CABLE, Choke Comment: (Handle)
35	11-46335	NUT, (.375-24) Comment: (Handle)
36	855732	BRACKET Comment: (Handle)
37	53-27290	RING, Retaining Comment: (Handle)
38	10-40011126	SCREW, (M6 x 13) Stainless Steel Comment: (Handle)
39	817428	SOCKET Comment: (Handle)
40	19-8354262	DIPSTICK
41	54-816311T	TIE STRAP, (8.00 Inches)
42	22-8830591	PIPE JOINT
43	32-896122	HOSE Comment: SN# USA-0T980000/BEL-0P325500 & Up
44	852484	SCREEN, Oil
45	54-8556951	CLAMP
46	54-8556961	CLAMP

▶Cylinder Head (16 parts)

Ref	OEM Part #	Part Name
-	27-835427A00	GASKET SET, Powerhead
1	835430T08	CYLINDER HEAD ASSEMBLY Comment: (Manual)(Use with 35mm Camshaft) SN# USA-0T178500/BEL-0P094500 & Up
2	850835	GUIDE, Intake
3	53-825038	CIRCLIP
4	22-822644	PIPE PLUG
5	10-855677	BOLT, (M8 x 78)
6	17-825689	PIN, Dowel
7	10-893745025	SCREW, (M6 x 25)
8	27-8M0052705	GASKET
9	834954	COVER
10	850837	SEAL
11	10-8257021	BOLT, (M6 x 20)
12	33-827858Q	SPARK PLUG, NGK-DPR6EA-9
13	859578A1	PLUG ASSEMBLY, Oil
14	NSS	NOT SOLD SEPARATE, O-Ring
15	NSS	NOT SOLD SEPARATE, Decal-recomm. Eng. Oil/Valve Cle.

▶Driveshaft Housing (30 parts)

Ref	OEM Part #	Part Name
1	1506-835409T1	HOUSING, Driveshaft Comment: (Long Non-Bigfoot)(X-Long BigfootI)
2	856157T	MOUNT, Upper Comment: (Bigfoot)
3	10-8136911	SCREW, (M8 x .98)
4	826276	BUMPER
5	27-8M0204692	GASKET
6	8288181	PLUG, Drain
7	853577T	COVER
8	27-854617	GASKET
9	10-4006731	SCREW, (M6 x 16)
10	26-827947	SEAL
11	32-855253	TUBE, Water Comment: (X-Long Bigfoot)
12	26-8272411	SEAL
13	26-413651	SEAL, Oil
14	852432	SEAL
15	856179	BRACKET
16	856196	SLEEVE
17	850862F2	COVER Comment: (Port) (Black)
18	850863F2	COVER Comment: (Starboard) (Black)
19	10-814776	SCREW, Adjusting (M6 x 55)
20	11-401386	NUT, (M6) Stainless Steel
21	8224211	BUMPER
22	25-855299	GROMMET
23	853963F1	ADAPTOR Comment: (Black) (Bigfoot)
24	23-12009	BUSHING, (.31 x .45 x .50) Comment: (Bigfoot)
25	10-82407110	SCREW, (M8 x 50) Comment: (Bigfoot)
26	10-8240717	SCREW, (M8 x 30) Comment: (Bigfoot)
27	825578A1	RELIEF VALVE ASSEMBLY
28	25-825579	O-RING
29	17-82364M	PIN, Dowel
30	22-68307	PLUG

▶Electrical Components (53 parts)

Ref	OEM Part #	Part Name
-	879783A01	POWERHEAD ASSEMBLY Comment: (Manual) SN# USA-0T178500/BEL-0P094500 & Up
1	835403T	BRACKET Comment: (Manual)
2	54-855686	CLAMP
3	10-855810	BOLT, (M6 x 20)
4	10-8248326	SCREW, (M6 x 25 MM)
5	12-855811	WASHER
6	25-97687M	GROMMET
7	23-852473	COLLAR
8	854650T2	RECTIFIER/REGULATOR Comment: (Electric)
9	10-811188T	BOLT, (M6 x 16) Comment: (Electric)
10	13541	PLUG, Male Comment: (Electric)
11	84-11149A43	CABLE ASSEMBLY, Brown/White Comment: (Electric)
12	84-824372A1	CABLE ASSEMBLY Comment: (Electric)
13	8M0010250	BRACKET Comment: (Electric)
14	825096T01	RELAY Comment: (Electric)
15	12-827205	WASHER Comment: (Electric)
16	11-827204	NUT, (M6) Comment: (Electric)
17	13-400256	LOCKWASHER, (M6) Comment: (Electric)
18	11-400212	NUT, (M6) Stainless Steel Comment: (Electric)
19	85-826574	BOOT Comment: (Electric)
20	855742	LEAD WIRE Comment: (Electric)
21	11-94330	NUT, (.250-20) Brass Comment: (Electric)
22	84-859312T1	HARNESS ASSEMBLY, Engine Wiring Comment: (Electric)
23	92753	RETAINER Comment: (Electric)
24	84-88439A29	CABLE ASSEMBLY, Battery - Positive Comment: (Electric)
25	84-88439A30	CABLE ASSEMBLY, Battery - Negative Comment: (Electric)
26	84-859451A1	HARNESS ASSEMBLY, Fuse Comment: (1 Piece Design)
27	88-812619	FUSE, Yellow - 20 Ampere Comment: (1 Piece Design)
28	828054	COVER, Fuse Comment: (1 Piece Design)
29	10-82130012	SCREW, (M6 x 12) Comment: (1 Piece Design)
30	12-8M0204649	WASHER, (.281 x .500 x .060) Stainless Steel Comment: (1 Piece Design)
31	84-859451A1	CABLE ASSEMBLY, Fuse Comment: (Multi-Piece Design)
32	88-8M0207796	FUSE, 20 Ampere Comment: (Multi-Piece Design)
33	84-95084A19	CABLE ASSEMBLY, Fuse Comment: (Multi-Piece Design)
34	54-816311T	TIE STRAP, (8.00 Inches)
35	84-824912A6	CABLE ASSEMBLY Comment: (Handle)
36	835401T1	CDI UNIT
37	10-84058M	BOLT, (M6 x 20)
38	855685T	COIL ASSEMBLY, Ignition - Includes Leads and Boots
39	84-825102A1	HIGH TENSION LEAD
40	25-82069M	GROMMET
41	853524	SWITCH, Oil Pressure
42	NSS	NOT SOLD SEPARATE, Screw
43	853537	LEAD WIRE
44	835406	RECTIFIER/REGULATOR Comment: (Manual)
45	10-811188T	BOLT, (M6 x 16) Comment: (Manual)
46	89-853598T	SOLENOID ASSEMBLY Comment: (Electric Non/Handle)
47	853599T	BRACKET Comment: (Electric Non/Handle)
48	853601	HOOK WIRE Comment: (Electric Non/Handle)
49	10-855739	SCREW, (M5 x 8) Comment: (Electric Non/Handle)
50	25-91782M	GROMMET Comment: (Electric Non/Handle)
51	25-82258M	O-RING Comment: (Electric Non/Handle)
52	10-811188T	BOLT, (M6 x 16) Comment: (Electric Non/Handle)

▶Extension Kit-Driveshaft Housing (828032A1/A2) (14 parts)

Ref	OEM Part #	Part Name
1	828032A2	EXTENSION KIT Comment: (Silver)
2	23-12009	BUSHING, (.31 x .45 x .50)
3	23-123691	BUSHING
4	123702	HOUSING
5	14107001	RETAINER
6	53-14094	RING, Snap
7	45-826745	DRIVESHAFT, (X-Long)
8	826874	SHIFT SHAFT
9	32-827231	TUBE, Water (X-Long)
10	10-82407110	SCREW, (M8 x 50)
11	10-8240717	SCREW, (M8 x 30)
12	25-822236	QUAD RING
13	27-192043	GASKET
14	27-19202001	GASKET

▶Flywheel (11 parts)

Ref	OEM Part #	Part Name
1	11-96650M	NUT, (M16)
2	12-96651M	WASHER
3	835397	FLYWHEEL Comment: (Electric)
4	835399T	COIL, Charging
5	10-853536	BOLT, (M6 x 25)
6	855944	COIL, Lighting Comment: (Electric)
7	10-853531	BOLT, (M6 x 40) Comment: (Electric)
8	54-816311T	TIE STRAP, (8.00 Inches)
9	835395	PULSER
10	10-811188T	BOLT, (M6 x 16)
11	NSS	NOT SOLD SEPARATE, Decal-Warning Neutral

▶Fuel Pump (21 parts)

Ref	OEM Part #	Part Name
-	27-835427A00	GASKET SET, Powerhead
1	835389T02	PUMP ASSEMBLY, Fuel
2	NSS	NOT SOLD SEPARATE, Body
3	21-41888M	CHECK VALVE
4	8095613	DIAPHRAGM
5	24-8095622	SPRING
6	8095632	PLUNGER
7	24-8095623	SPRING
8	10-8095641	SCREW, (M4 x 30)
9	8095614	DIAPHRAGM
10	10-41889M	SCREW, (M3 x 5)
11	11-8237515	NUT, (M4)
12	17-8095662	PIN
13	35-80365M	FILTER, To Fuel Connector Comment: SN# 0T003861 & Below
14	54-82047M	CLAMP Comment: SN# 0T003861 & Below
15	32-8M0060021	HOSE (2.44 Inches) Comment: SN# 0T003861 & Below
16	10-855683	SCREW, (M6 x 25)
17	25-825478	O-RING
18	54-82047M	CLAMP
19	32-8M0053527	HOSE, To Carb
20	54-83577M	CLAMP

▶Fuel Tank (8 parts)

Ref	OEM Part #	Part Name
1	1260-859060A2	TANK ASSEMBLY, Fuel
2	36-816976Q1	CAP ASSEMBLY, Fuel
3	27-8169771	GASKET, Fuel Cap
4	22-8M0175544	CONNECTOR KIT, Fuel
5	NSS	NOT SOLD SEPARATE, Connector
6	25-823533	O-RING
7	NSS	NOT SOLD SEPARATE, Tube
8	35-823534	SCREEN

▶Gear Housing(Driveshaft)(2.00:1 Gear Ratio) (45 parts)

Ref	OEM Part #	Part Name
-	46-42089A5	PUMP KIT, Water
1	1600-8M0083312	GEAR HOUSING ASSEMBLY, Basic-Black Comment: (Basic - Black)
2	23-12009	BUSHING, (.31 x .45 x .50)
3	22-8M0058389	PLUG KIT, Drain (Magnetic) Comment: SN# USA-0T980000/BEL-0P325500 & Up
4	12-191833	SEAL
5	822244A1	SLEEVE ASSEMBLY
6	23-823944	SLEEVE
7	23-823943	BUSHING
8	10-79953Q04	SCREW KIT, (.375-16 x .250) Drain
9	12-191833	SEAL
10	35-421991	SCREEN
11	10-13954	SCREW, (.250-14 x .88)
12	97-42121Q02	ANODE ASSEMBLY
13	10-13954	SCREW, (.250-14 x .88)
14	26-42133	SEAL
15	43-8219251	GEAR, Pinion - 13-26
16	12-41369	WASHER, Thrust
17	31-22756	BEARING, Roller
18	46-42040T5	BASE ASSEMBLY, Water Pump
19	27-192043	GASKET
20	26-33613	SEAL
21	42375	RETAINER
22	10-48408	SCREW, (#10-16 x .500)
23	25-822236	QUAD RING
24	26-413651	SEAL, Oil
25	27-19202001	GASKET Comment: SN# USA-0T980000/BEL-0P325500 & Up
26	32-42185A1	TUBE ASSEMBLY, Water
27	42200	FACE PLATE
28	46-42089A2	COVER ASSEMBLY
29	NSS	NOT SOLD SEPARATE, Insert
30	26-421021	SEAL
31	47-42038Q02	IMPELLER Comment: SN# USA-0T801000/BEL-0P268000 & Up
32	28-8M0173458	KEY ASSEMBLY
33	NSS	NOT SOLD SEPARATE, Washer
34	444671	GUIDE
35	10-82684430	SCREW, (M6 x 30)
36	12-8M0204649	WASHER, (.281 x .500 x .060) Stainless Steel
37	42039	CAM
38	855281	SHIFT SHAFT Comment: (Long)
39	11-400212	NUT, (M6) Stainless Steel
40	822419	COUPLER
41	8529941	SHIFT SHAFT (Upper)
42	53-42389	E RING
43	45-825843	DRIVESHAFT Comment: (Long)
44	12-822248	THRUST WASHER

▶Gear Housing(Driveshaft)(2.42:1 Gear Ratio) (46 parts)

Ref	OEM Part #	Part Name
-	46-99157T2	PUMP KIT, Water
1	1600-8M0083538	GEAR HOUSING ASSEMBLY, Basic-Black Comment: (Basic - Black)
2	NSS	NOT SOLD SEPARATE, Sleeve
3	26-99325	SEAL
4	31-41326	BEARING, Roller
5	17-8M0084726	PIN, Dowel (.187 x .530)
6	10-79953Q04	SCREW KIT, (.375-16 x .250) Drain
7	12-191833	SEAL
8	35-41133	SCREEN, Water Inlet Port
9	10-40031112	SCREW, (M5 x 40)
10	22-8M0058389	PLUG KIT, Drain (Magnetic) Comment: SN# USA-0T980000/BEL-0P325500 & Up
11	12-191833	SEAL
12	35-41134	SCREEN
13	11-401365	NUT, (M5) Stainless Steel
14	31-98294A1	BEARING ASSEMBLY, Roller
15	NSS	NOT SOLD SEPARATE, Cup
16	43-854498	GEAR, Pinion - 12-29
17	11-828490	NUT
18	27-993261	GASKET
19	85083	FACE PLATE
20	12-866451	WASHER
21	28-8M0214993	KEY
22	47-8M0204712	IMPELLER
23	12-866451	WASHER
24	25-69202	O-RING
25	46-99157A02	PUMP ASSEMBLY, Water Comment: SN# USA-0T801000/BEL-0P268000 & Up
26	NSS	NOT SOLD SEPARATE, Insert
27	26-85090001	SEAL Comment: SN# USA-0T980000/BEL-0P325500 & Up
28	25-86203	O-RING
29	10-8248324	SCREW, (M6 x 16)
30	854504	SHIFT SHAFT Comment: (X-Long)
31	11-400212	NUT, (M6) Stainless Steel
32	822419	COUPLER
33	8529941	SHIFT SHAFT, Upper
34	45-854502	DRIVESHAFT Comment: (X-Long)
35	85552001	BOOT Comment: SN# USA-0T980000/BEL-0P325500 & Up
36	93878	RETAINER
37	25-35276	O-RING, (.734 x .139)
38	25-85594	O-RING, (.239 x .174)
39	12-85091	WASHER
40	24-93007	SPRING
41	12-8M0204649	WASHER, (.281 x .500 x .060) Stainless Steel
42	17-85593	PIN, (.078 x .437)
43	85562A2	SHIFT CAM
44	17-85096	PIN, Drive
45	23-29804T	SLEEVE, Water Tube

▶Gear Housing, Propeller Shaft - 2.00:1 Gear Ratio (24 parts)

Ref	OEM Part #	Part Name
-	26-41365A3	SEAL KIT
0	1666-8833T35	GEAR HOUSING ASSEMBLY, Complete (2.60 Inch/102 mm Torpedo Diameter) Comment: (Long - Black)
1	1600-8M0083312	GEAR HOUSING ASSEMBLY, Basic-Black Comment: (Basic - Black)
2	31-821321A1	BEARING ASSEMBLY, Roller
3	NSS	NOT SOLD SEPARATE, Cup
4	43-821924A1	GEAR ASSEMBLY, Forward (13-26)
5	23-41367	BUSHING
6	813139	FOLLOWER, Cam
7	52-821930A1	CLUTCH ASSEMBLY
8	17-823951	PIN, Cross
9	24-42204	SPRING
10	44-821929	PROPELLER SHAFT
11	43-821926T1	GEAR, Reverse - 13/26
12	42144T3	CARRIER, Bearing
13	25-8M0214923	O-RING, (1.984 x .139)
14	23-821927	BUSHING
15	26-99325	SEAL
16	26-821928	SEAL, Oil
17	10-82407110	SCREW, (M8 x 50)
18	10-8240717	SCREW, (M8 x 30)
19	48-828156A12	PROPELLER, (9.00 x 9.00)
20	11-40140	NUT, (M10)
21	8219321	THRUST HUB
22	23-420911	SPACER

▶Gear Housing, Propeller Shaft - 2.42:1 Gear Ratio (28 parts)

Ref	OEM Part #	Part Name
-	26-85090A2	SEAL KIT
1	1600-8M0083538	GEAR HOUSING ASSEMBLY, Basic-Black Comment: (Basic - Black)
45	97-98432Q6	TRIM TAB
46	10-4000354	SCREW, (M8 x 30)
47	12-8M0042642	WASHER, (.323 x .563 x .063) Stainless Steel
48	31-8M0103470	BEARING ASSEMBLY, Roller
49	NSS	NOT SOLD SEPARATE, Cup
50	43-854496A1	GEAR ASSEMBLY, Forward - 12/29
51	23-85557	BUSHING
52	85094	FOLLOWER, Cam
53	24-38114	SPRING
54	52-41040T1	CLUTCH
55	17-8M0020999	PIN
56	24-88680	SPRING
57	44-8166231	PROPELLER SHAFT
58	43-854497T	GEAR, Reverse - 12/29
59	99906T1	CARRIER ASSEMBLY, Bearing
60	31-21739	BEARING, Roller
61	26-41132	SEAL, Oil, Inner
62	26-41131	SEAL, Oil, Outer
63	25-85549	O-RING
64	87293	PLATE
65	10-90883	SCREW, (M5 x 16)
66	10-87810178	SCREW, (M10 x 35)
67	12-43328	WASHER
68	858498	THRUST HUB ASSEMBLY
69	48-19636A10	PROPELLER
70	11-88228	PROP NUT

▶Intake (15 parts)

Ref	OEM Part #	Part Name
-	27-835427A00	GASKET SET, Powerhead
1	835385T	MANIFOLD, Intake
2	27-853525	GASKET
3	17-82364M	PIN, Dowel
4	10-853531	BOLT, (M6 x 40)
5	853526	INSULATOR Comment: (8/9.9/15)
6	27-835383	GASKET
7	25-8250572	O-RING
8	835386T	SILENCER
9	37-8272822	DECAL, Warning Comment: (High Voltage)
10	803872	PLATE
11	855780	COLLAR
12	10-8M0100009	BOLT, (M6 x 100)
13	32-852463	HOSE
14	882759	PLATE, Restrictor Comment: (13.5)

▶Intake/Exhaust Valves (17 parts)

Ref	OEM Part #	Part Name
-	27-835427A00	GASKET SET, Powerhead
1	850838T	VALVE, Intake
2	850839T	VALVE, Exhaust
3	855959	SEAT, Valve Spring
4	24-850840	SPRING, Valve
5	822650	RETAINER
6	28-893554	KEY
7	26-822647	SEAL, Valve Stem
8	850841A1	ROCKER ARM ASSEMBLY
9	10-825046	SCREW
10	11-826150	NUT
11	850842	SHAFT, Rocker
12	825451	COLLAR Comment: SN# USA-0T178500/BEL-0P094500 & Up
13	880135	COLLAR Comment: SN# USA-0T178500/BEL-0P094500 & Up
14	880134	COLLAR Comment: SN# USA-0T178500/BEL-0P094500 & Up
15	24-825452	SPRING
16	24-825453	SPRING

▶Oil Pump/Camshaft (16 parts)

Ref	OEM Part #	Part Name
-	27-835427A00	GASKET SET, Powerhead
1	880136A02	CAMSHAFT Comment: (Manual)(35mm) SN# USA-0T178500/BEL-0P094500 & Up
2	25-825462	O-RING
3	27-853523	GASKET
4	10-850879	BOLT, (M6 x 35)
5	28-8M0084803	KEY
6	26-825455	SEAL, Oil
7	12-82710M	WASHER
8	43-834973T	GEAR, Driven
9	12-825498	WASHER
10	10-826957M	BOLT
11	834967A1	PUMP ASSEMBLY, Oil Comment: SN# USA-0T178499/BEL-0P094499 & Below
12	43-8M0063224	GEAR, Drive
13	12-850843	WASHER
14	11-855679	NUT, (M28)
15	57-835392Q	TIMING BELT Comment: SN# USA-0T801000/BEL-0P268000 & Up

▶Powerhead Gasket Set Components (2 parts)

Ref	OEM Part #	Part Name
-	27-835427A00	GASKET SET, Powerhead
0	26-855681	SEAL, Oil, Crankshaft-Bottom

▶Service/Support Material (1 parts)

Ref	OEM Part #	Part Name
0	37-804652A05	DECAL, EPA Label Information Comment: 2005

▶Starter Assembly (38 parts)

Ref	OEM Part #	Part Name
-	8M0049883	RECOIL ASSEMBLY
1	850865A1	HANDLE REST
2	8M0043417	SEAL
3	85174A1	HANDLE ASSEMBLY Comment: (Handle Models)
4	NSS	NOT SOLD SEPARATE, Retainer
5	8524791	PILOT LAMP Comment: (Handle Models)
6	11-856949	NUT Comment: (Handle Models)
7	10-8147762	SCREW, (M6 x 16)
8	853541	HOUSING
9	23-852473	COLLAR
10	50-8527732	SHEAVE, Starter
11	852777	PAWL
12	24-852778	SPRING, Starter
13	852780	DRIVEPLATE ASSEMBLY
14	24-852778T01	SPRING, Drive Pawl
15	24-8527782	SPRING
16	24-8527783	SPRING, Return
17	53-852784	CIRCLIP
18	10-852785	BOLT
19	25-852786	GROMMET
20	50-12066Q10	ROPE
21	8527881	STOPPER
22	24-8560361	SPRING, Return
23	24-856036	SPRING
24	10-84058M	BOLT, (M6 x 20)
25	10-855783	BOLT, (M6 x 90)
26	12-82213M	WASHER
27	11-82390M	NUT, (M6)
28	19-858768	PLUG Comment: (Electric Non-Handle)
29	19-822513002	PLUG Comment: (Electric Non-Handle) SN# USA-0T980000/BEL-0P325500 & Up
30	853541	HOUSING Comment: (Electric)
31	23-852473	COLLAR Comment: (Electric)
32	37-881865	DECAL, Caution-Start in Gear Comment: (Start In Gear) (Electric)
33	NSS	NOT SOLD SEPARATE, Decal Comment: (Emergency Start Procedure)
34	855691	COVER
35	25-8527681	GROMMET
36	NSS	NOT SOLD SEPARATE, Decal Comment: (Servicing Referral)
37	37-804652A05	DECAL, EPA Label Information Comment: 2005

▶Starter Motor (13 parts)

Ref	OEM Part #	Part Name
1	10-4000357	SCREW, (M8 x 45)
2	12-4002317	WASHER Comment: (Bottom)
3	50-859168T	STARTER MOTOR ASSEMBLY Comment: (Retaining Ring Design)
4	10-965662	THRU BOLT
5	891752	DRIVE KIT Comment: (Nut Design)
6	906432	DRIVE KIT Comment: (Retaining Ring Design)
7	8236385	ARMATURE Comment: (Nut Design)
8	68575T2	PINION
9	8236391	DRIVE CAP
10	8119012	CAP, Commutator
11	898265016	BRUSH/SPRING KIT
12	898265014	HOLDER
13	F15158	SCREW

▶Swivel Bracket (52 parts)

Ref	OEM Part #	Part Name
1	3415-822237A3	SWIVEL BRACKET Comment: (Black)
2	22-8M0169589	FITTING, Grease
3	22-8M0169589	FITTING, Grease
4	22-8M0169589	FITTING, Grease
5	23-855628A1	BUSHING
6	NSS	NOT SOLD SEPARATE, O-Ring
7	NSS	NOT SOLD SEPARATE, Bushing
8	NSS	NOT SOLD SEPARATE, Bushing
9	NSS	NOT SOLD SEPARATE, Washer
10	821961	ROD Comment: (Handle)
11	8165621	DISC Comment: (Handle)
12	821958A1	PLATE KIT Comment: (Handle)
13	10-40011126	SCREW, (M6 x 13) Stainless Steel Comment: (Handle)
14	821957	BRAKE PLATE Comment: (Handle)
15	12-29330	WASHER Comment: (Handle)
16	821959	HANDLE Comment: (Handle)
17	11-8M0204726	NUT, (.375-24) Stainless Steel Comment: (Handle)
18	98830A4	HOOK ASSEMBLY, Reverse Lock
19	24-96018	SPRING
20	24-879894	SPRING Comment: (Handle)
21	53-13194	RING, Retaining Comment: (Handle)
22	17-13195	PIN Comment: (Handle)
23	12756	BRACKET Comment: (Handle)
24	24-12754	SPRING Comment: (Handle)
25	12758	LEVER Comment: (Handle)
26	53-13194	RING, Retaining Comment: (Handle)
27	10-849838	SCREW, (.375-24 x 1.250) Comment: SN# USA-0T980000/BEL-0P325500 & Up
28	41323A03	ATTACHING KIT, Steering Link Comment: (Electric - Non-Handle)
29	12-37828	WASHER, (.390 x .625 x .062) Stainless Steel Comment: (Electric - Non-Handle)
30	11-8M0204726	NUT, (.375-24) Stainless Steel Comment: (Electric - Non-Handle)
31	96186A2	BRACKET ASSEMBLY Comment: (Black)(Electric - Non-Handle)
32	10-1993325	SCREW, (M10 x 25 MM) Comment: (Electric - Non-Handle)
33	13-400248	LOCKWASHER, (M10) Comment: (Electric - Non-Handle)
34	854801T2	SWIVEL HEAD ASSEMBLY Comment: (Black)
35	858338A1	SHAFT, Reverse Lock
36	23-F536813	BUSHING
37	8M0036770	GUIDE
38	10-40011109	SCREW, (M5 x 25) Stainless Steel
39	11-401385	NUT, (M5) Stainless Steel
40	858338A3	LINK ROD KIT, Reverse Lock Comment: (May Be Used In Place Of Ref. #35)
41	10-858407	BOLT, (M5 x 6) Comment: (May Be Used In Place Of Ref. #35)
42	16-854819	STUD, (M10 x 1.5 x 97)
43	12-4002320	WASHER
44	11-4013610	NUT, (M10) Stainless Steel
45	8M0039074	MOUNT
46	854729T1	COVER Comment: (Starboard) (Black)
47	854728T1	COVER Comment: (Port) (Black)
48	10-19943100	SCREW, (M8 x 100)
49	10-1994360	SCREW, (M8 x 60)
50	12-36001	WASHER
51	11-400213	NUT, (M8) Stainless Steel
52	NSS	NOT SOLD SEPARATE, Decal-Serial Overlaminate

▶Throttle/Shift Linkage(Handle Models) (44 parts)

Ref	OEM Part #	Part Name
1	10-8248291	SCREW, (M6 x 20)
2	856905	COVER
3	NSS	NOT SOLD SEPARATE (Decal-F,N,R)
4	10-8M0204741	SCREW, (M6 x 20) Stainless Steel
5	856909	BRACKET
6	10-8M0204741	SCREW, (M6 x 20) Stainless Steel
7	12-8M0214930	WASHER
8	825787A2	PULLEY ASSEMBLY
9	23-825788	BUSHING
10	11-401366	NUT, (M6) Stainless Steel
11	882818	LINK, Throttle
12	856904A2	SHIFT PLATFORM KIT Comment: (Design II)
13	8569111	SHAFT Comment: (Design II)
14	19-48323	PLUG Comment: (Design II)
15	856904A2	SHIFT PLATFORM Comment: (Design I)
16	856911	SHAFT Comment: (Design I)
17	53-95019	RING, Retaining Comment: (Design I)
18	856910	SEAL
19	53-857213	RING, Retaining
20	13-69150	WAVE WASHER
21	856906	SHIFT HANDLE
22	856908	SHIFT LINK
23	856907	LEVER, Shift
24	10-82239312	SCREW, (M5 x 12)
25	852494A6	SHIFT SHAFT ASSEMBLY, Horizontal Comment: (Bigfoot)
26	826063	LEVER, Interlock Comment: (Non-Bigfoot)
27	10-40011111	SCREW, (M5 x 35) Stainless Steel
28	24-824992	SPRING, Detent
29	24-824993	SPRING, Backing
30	824994	SPRING, Plate
31	10-82239312	SCREW, (M5 x 12)
32	8280471	STRAP
33	10-8M0204741	SCREW, (M6 x 20) Stainless Steel
34	8354191	SEAL
35	87-11083A30	SWITCH ASSEMBLY
36	8M0032846	RETAINER, Brass
37	15920Q54	LANYARD ASSEMBLY
38	54-816311T	TIE STRAP, (8.00 Inches)
39	852472	WIRE
40	855888F	BRACKET
41	10-82239312	SCREW, (M5 x 12)
42	87-8M0052929	SWITCH ASSEMBLY Comment: (Electric)
43	824923	PLATE Comment: (Electric)
44	10-82470620	SCREW, (M3.5 x 20) Comment: (Electric)

▶Throttle/Shift Linkage(Non-Handle Models) (37 parts)

Ref	OEM Part #	Part Name
1	8280471	STRAP
2	10-8M0204741	SCREW, (M6 x 20) Stainless Steel
3	10-82239312	SCREW, (M5 x 12)
4	824994	SPRING, Plate
5	24-824993	SPRING, Backing
6	24-824992	SPRING, Detent
7	852494A5	SHIFT SHAFT ASSEMBLY, Horizontal Comment: (Non-Bigfoot)
8	826063	LEVER, Interlock Comment: (Non-Bigfoot)
9	10-40011111	SCREW, (M5 x 35) Stainless Steel
10	835415F	REMOTE CONTROL PLATFORM
11	10-8M0204741	SCREW, (M6 x 20) Stainless Steel
12	852498	COVER
13	10-832047	SCREW, (M6 x 20)
14	8524961	LEVER, Shift Shaft
15	10-82239312	SCREW, (M5 x 12)
16	852497A2	SHIFT LINK ASSEMBLY
17	817428	SOCKET
18	10-32,11-45076	NUT, Brass
19	53-857213	RING, Retaining
20	8354191	SEAL
21	850856	LEVER, Shift
22	23-91912	BUSHING
23	10-8M0204741	SCREW, (M6 x 20) Stainless Steel
24	822459	RETAINER
25	11-825677	PUSH NUT
26	850857	LEVER, Throttle
27	822459	RETAINER
28	11-825677	PUSH NUT
29	10-82129145	SCREW, (M6 x 45)
30	23-855765	BUSHING
31	828049	SLIDE
32	882817	LINK, Throttle Comment: SN# USA-0T801000/BEL-0P268000 & Up
33	53-8237951	RING, Retaining
34	25-828114	GROMMET
35	19-855937	PLUG
36	54-28700	CLAMP Comment: (Electric)
37	10-82239312	SCREW, (M5 x 12) Comment: (Electric)

▶Tiller Handle (31 parts)

Ref	OEM Part #	Part Name
-	821468T65	TILLER HANDLE ASSEMBLY Comment: (Black)
1	822148A3	COVER KIT
2	822150	PULLEY
3	NSS	NOT SOLD SEPARATE, Body
4	10-878608	SCREW, (#10-16 x .500)
5	43242T09	CABLE, Throttle
6	85-9600910	SLEEVE
7	821468A66	ARM ASSEMBLY, Steering Handle Comment: (Black)
8	10-40011107	SCREW, (M5 x 16) Stainless Steel
9	10-40011107	SCREW, (M5 x 16) Stainless Steel
10	821972T	KNOB, Throttle
11	24-96203	SPRING
12	892995	LOCK, Throttle
13	10-8M0204707	SCREW, (M6 x 25)
14	821463T01	TILLER TUBE
15	37-8242003	DECAL
16	821465	HANDLE, Throttle
17	8M0221732	GRIP
18	87-8M0104613	SWITCH ASSEMBLY, Stop
19	822441	RETAINER
20	23-823939	BUSHING
21	12-822145	WASHER
22	13-826792	WAVE WASHER
23	12-822146	WASHER
24	822841F1	BRACKET, Steering Arm Comment: (Black)
25	10-4000384	SCREW, (M10 x 80)
26	826648	PLATE
27	889734	HOUSING, Switch Comment: (Electric Handle) SN# USA-0T801000/BEL-0P268000 & Up
28	824918	CLIP Comment: (Electric Handle)
29	87-823609A8	SWITCH ASSEMBLY Comment: (Electric Handle)
30	37-855262	DECAL, Start Comment: (Electric Handle)

▶Tools (23 parts)

Ref	OEM Part #	Part Name
1	NSS	NOT SOLD SEPARATE, Oil Filter Wrench (Obtain Locally)
2	91-83164M	FLYWHEEL PULLER
3	91-8M0161873	HOLDER TOOL, Flywheel
4	FT2997	COMPRESSOR TOOL, Piston Ring
6	91-809494A1	COMPRESSOR TOOL, Valve Spring
7	91-809495001	REMOVER TOOL, Valve Guide
8	91-809496A1	INSTALLER TOOL, Valve Guide Bushing
9	91-809497A1	REAMER TOOL, Valve Guide
10	NSS	NOT SOLD SEPARATE, Valve Seat Cutter Kit (Obtain Locally)
11	91-828999	WRENCH
12	91-37241	PULLER PLATE
13	91-83165T	PULLER ASSEMBLY
14	91-34569A1	PULLER ASSEMBLY, Slide Hammer
15	91-93843T1	INSTALLER TOOL, Bearing Carrier Comment: (Bigfoot)
16	91-824788A1	REMOVAL TOOL, Bearing
17	91-824790A1	INSTALLATION TOOL, Driveshaft Bushing
18	91-13658T	MANDREL
19	91-824787	REMOVAL TOOL, Bushing
20	91-824785T1	INSTALLER TOOL, Bushing And Seal
21	91-29310	PLATE
22	NSS	NOT SOLD SEPARATE, Expanding Rod (Snap-On #CG40-4)
23	NSS	NOT SOLD SEPARATE, Collet (Jaws)(Snap-On #CG40A6)
24	FT8950	TESTER KIT

▶Top Cowl (15 parts)

Ref	OEM Part #	Part Name
1	114-852413T4	TOP COWL ASSEMBLY Comment: (Silver)
2	852490F	BRACKET
3	827702T	COVER
4	826649	LATCH
5	10-8231872	SCREW, (M4 x 12)
6	8,13-26995	LOCKWASHER, Stainless Steel
7	11-8237515	NUT, (M4)
8	NSS	NOT SOLD SEPARATE, Insert
9	10-95700	SCREW, (#10-16 x .50)
10	852491A1	BRACKET ASSEMBLY
11	10-40011126	SCREW, (M6 x 13) Stainless Steel
12	18745	ROLLER
13	8M0043391	SEAL, Cowl
14	47341A11	ROPE AND HANDLE KIT, Manual Starting
15	NSS	NOT SOLD SEPARATE, Starter Rope

▶Visual Warning (13 parts)

Ref	OEM Part #	Part Name
1	17334A4	PLATE ASSEMBLY, Lamp Mounting
2	88-17429	LAMP
3	76424	BRACKET
4	16-55422	STUD, (#10-32 x 2.00)
5	12-24676	WASHER, (.200 x .440 x .032)
6	10-32,11-68219	NUT, Stainless Steel
7	86-45915	TERMINAL BLOCK
8	10-16324	SCREW, (#8 x .625)
9	10-878607	SCREW, (#10-16 x .375)
10	84-11149A3	CABLE ASSEMBLY
11	85-623594	INSULATOR, (2.00 Inch)
12	10-24231	SCREW, (#10-32 x .250)
13	10-32,11-27164	NUT AND LOCKWASHER,

100-Hour / Annual Service Checklist

Regular maintenance keeps your Mercury 15 (4-STROKE) 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.

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