Mercury 15 SEAPRO (4-STROKE) (0R051685 THRU 0R123564) Parts & Diagrams

🔎 Mercury 15 SEAPRO (4-STROKE) Reference Library — Exploded parts diagrams (21 diagrams), specifications, common issues, and maintenance checklist.

The Mercury 15 SEAPRO (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 SEAPRO (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 SEAPRO (4-STROKE).

▶Accessories (1 parts)

Ref	OEM Part #	Part Name
-	50-853805A05	STARTER MOTOR KIT, Electric

▶Bottom Cowl (22 parts)

Ref	OEM Part #	Part Name
1	2189-853778008	BOTTOM COWL
2	23-8537437	MOUNT, Rubber
3	23-853715007	SPACER
4	10-16830	BOLT
5	12-161404	WASHER
6	13-16221	WAVE WASHER
7	16222003	HOOK, Cover
8	10-8230427	BOLT
9	12-953921	WASHER
10	25-16226	GROMMET
11	817015003	LATCH, Cowl
12	26-16219	SEAL
13	23-163365	BUSHING
14	NSS	NOT SOLD SEPARATE, Decal Storage
15	25-851850010	GROMMET
16	22-898101961	NIPPLE
17	22-8M0182334	CONNECTOR, Fuel - Brass
18	10-8M0204707	SCREW, (M6 x 25)
19	32-851848014	TUBING, (350 mm)
20	54-95395	CLIP, Stainless Steel
21	25-803513008	GROMMET
22	25-853709008	GROMMET

▶Camshaft and Oil Pump (20 parts)

Ref	OEM Part #	Part Name
-	27-835427A05	GASKET SET, Powerhead
1	834956003	CAMSHAFT
2	17-95218015	PIN, Camshaft
3	834967005	PUMP, Oil
4	25-857096001	O-RING
5	25-857093001	O-RING
6	25-857094001	O-RING
7	25-857094002	O-RING
8	10-850879001	BOLT
9	28-95229	KEY
10	26-825455001	SEAL, Oil
11	12-895118003	WASHER
12	43-834973002	DRIVEN PULLEY
13	10-16705	BOLT
14	12-895118	WASHER
15	57-895120002	TIMING BELT
16	11-855679003	NUT
17	13-823032002	LOCKWASHER
18	895119002	PLATE
19	43-834955003	DRIVE PULLEY

▶Carburetor (30 parts)

Ref	OEM Part #	Part Name
-	3303-895110A08	CARBURETOR
1	802690008	FLOAT BOWL
2	27-802699004	GASKET
3	853830003	PLUNGER, Complete
4	24-895116001	SPRING
5	10-895136001	SCREW
6	10-162601	SCREW
7	10-803509015	SCREW, Drain
8	27-8M0094878	GASKET
9	16253004	FLOAT
10	17-16256004	FLOAT, Arm Pin
11	10-16196001	SCREW
12	895115001	BOOT, Rubber
13	853746003	ROD, Link
14	802700006	NOZZLE, Main
15	802701007	JET, (Main #105)
16	803689005	JET, Slow
17	16252	CAP
18	898101063	VALVE, Float
19	853721	PIN, Valve
20	54-16255	CLIP
21	10-16263	SCREW
22	24-16264002	SPRING
23	10-895140004	SCREW
24	855540003	COVER, Carburetor
25	27-855541004	GASKET
26	10-855542	SCREW
27	854254005	ENRICHENER, With O-Ring
28	854255001	PLATE
29	10-855542	SCREW

▶Clamp Bracket (42 parts)

Ref	OEM Part #	Part Name
1	8M0059728	CLAMP BRACKET, Starboard
2	8M0059734	CLAMP BRACKET, Port
3	898101191	TILT TUBE
4	11-853722029	NUT
5	23-8537435	BUSHING
6	11-85372214	CAP NUT
7	898101938	DISTANCE PIECE
8	12-16826	WASHER, Stainless Steel
9	12-16826	WASHER, Stainless Steel
10	11-400212	NUT
11	16198004	THRUST ROD
12	24-815093003	SPRING
13	10-16200A1	THUMB SCREW ASSEMBLY
14	12-95379	PAD
15	37-823701003	DECAL, Co-Pilot
16	97-823913Q	ANODE
17	10-167051	BOLT, (M6 x 20)
18	17-803784002	SHAFT, Reverse Lock
19	53-160572	E RING
20	10-879194310	BOLT
21	12-16192	WASHER
22	11-879194337	NUT
23	8M0051399	BUTTON
24	8M0183798	GRIP
25	803789	LEVER, Reverse Lock
26	10-803790	BOLT
27	13-17641	WAVE WASHER
28	12-953921	WASHER
29	803783001	ARM, Reverse Lock
30	24-803788	SPRING
31	24-8037461	SPRING
32	803782	LOCK, Reverse
33	17-8037841	ROD, Reverse Lock
34	18-8150261	COTTER PIN
35	898103103	STOP, Tilt
36	10-850879003	BOLT
37	8M0157137	SET PLATE
38	17-170331	PIN, Spring
39	23-163364	BUSHING
40	853774	STOP
41	24-953832	SPRING
42	803787	LINK, Reverse Lock

▶Crankshaft, Pistons and Connecting Rods (15 parts)

Ref	OEM Part #	Part Name
-	895274A05	POWERHEAD ASSEMBLY
1	400-834957A03	CRANKSHAFT
2	31-834960012	BEARING Comment: (Brown)
3	26-855681004	SEAL, Oil
4	26-855681005	SEAL, Oil
5	28-825666001	KEY
6	28-825666001	KEY
7	600-834961003	ROD, Connecting
8	10-8035092	BOLT
9	41-898103113	PIN, Piston
10	53-160573	E RING
11	700-834963006	PISTON Comment: (0.5 mm Oversize)
12	39-8035181	RING, Piston - Top Comment: (0.5 mm Oversize)
13	39-8035191	RING, Piston - Second Comment: (0.5 mm Oversize)
14	26-8035201	RING, Oil Comment: (0.5 mm Oversize)

▶Cylinder Block (41 parts)

Ref	OEM Part #	Part Name
-	27-850836A05	GASKET SET, Powerhead
1	878-815013A08	CYLINDER BLOCK
2	17-16119	PIN, Dowel
3	10-855677005	BOLT
4	10-166985	BOLT
5	12-809931044	WASHER
6	22-822644001	NIPPLE
7	10-855677004	BOLT
8	803666005	COVER, Exaust
9	27-803663016	GASKET
10	10-825009026	BOLT
11	32-851848003	HOSE, (330 mm), To Tell Tale
12	10-16832	BOLT, (M6 x 16)
13	97-823912	ANODE
14	27-895150001	GASKET
15	97-895151001	PLUG, Anode
16	10-167051	BOLT
17	35-8M0162831	FILTER ASSEMBLY, Oil
18	54-816311T	TIE STRAP, (8.00 Inches)
19	32-8M0057117	HOSE
20	35-895152003	STRAINER, Oil
21	10-898103228	BOLT
22	853756002	PLATE
23	27-851834001	GASKET
24	898101142	PLUNGER
25	834954004	COVER , Plunger
26	32-851848025	TUBE
27	54-95224	CLIP
28	803512002	DIPSTICK
29	803511001	CAP
30	27-803508020	GASKET
31	10-895136003	SCREW
32	54-803563005	CLAMP
33	855550003	LIFTING EYE
34	10-16830009	BOLT
35	54-8M0130961	CLAMP
36	10-16223	BOLT, (M6 x 14)
37	8M0119207	THERMOSTAT, 60 Degrees
38	8537052	CAP
39	27-8M0214960	GASKET
40	10-8M0102279	BOLT, Stainless Steel

▶Cylinder Head (14 parts)

Ref	OEM Part #	Part Name
-	27-850836A05	GASKET SET, Powerhead
1	900-835430A05	CYLINDER HEAD ASSEMBLY
2	27-850836003	GASKET
3	17-16119	PIN, Dowel
4	10-855677002	BOLT
5	10-823042054	BOLT
6	10-823042055	BOLT
7	12-809931044	WASHER
8	834954003	COVER
9	27-803508019	GASKET, Rubber
10	10-16830A1	SCREW KIT
11	36-8M0135589	CAP ASSEMBLY, Oil Filler
12	25-803513007	O-RING
13	33-8M0204682	SPARK PLUG, NGK#DCPR6E

▶Driveshaft Housing (24 parts)

Ref	OEM Part #	Part Name
-	27-850836A05	GASKET SET, Powerhead
1	1599-803725003	HOUSING, Driveshaft Comment: (Long)
2	852432004	SEAL, Rubber
3	17-16119	PIN, Dowel
4	26-8036675	SEAL, Oil
5	853771006	RUBBER MOUNT
6	853772004	LOCK PLATE
7	10-879194273	BOLT
8	19-803593	PLUG
9	27-854617002	GASKET
10	853577002	COVER, Idle Port
11	10-810755013	BOLT
12	25-851850009	GROMMET
13	8M0111615	BOLT
14	12-895146	WASHER
15	25-804899003	GROMMET
16	26-16168003	SEAL, Rubber
17	32-803755009	TUBE, Water Comment: (Long)
18	803758001	GUIDE, Rubber
19	852432003	SEAL, Rubber
20	850862001	COVER, Port
21	850863001	COVER, Starboard
22	10-16257005	SCREW
23	11-400212	NUT, (M6) Stainless Steel

▶Electrical Components (34 parts)

Ref	OEM Part #	Part Name
1	262-803577003	FLYWHEEL
2	11-851832001	NUT, Gold
3	12-853991002	WASHER
4	16058004	STATOR
5	10-853536002	SCREW
6	12-895106003	WASHER
7	54-953951	CLAMP
8	10-162452	SCREW
9	895267001	BRACKET
10	10-855544016	SCREW
11	17-16119	PIN, Dowel
12	835395004	COIL, Pulser
13	10-878388001	SCREW
14	835401004	CD UNIT
15	10-16705	BOLT
16	12-953921	WASHER
17	54-17169001	CLAMP
18	853739004	BRACKET
19	23-8M0021168	COLLAR, (9.3 mm)
20	25-851815005	GROMMET
21	12-953921	WASHER
22	10-8M0204707	SCREW, (M6 x 25)
23	12-953924	WASHER, (Rubber)
24	84-895121A04	CD HARNEST
25	19-853994	TERMINAL PLUG
26	339-803559A04	COIL ASSEMBLY, Ignition
27	85-803560001	BOOT
28	10-823042	BOLT
29	804057001	PILOT LAMP
30	54-813275	CLAMP
31	87-8M0163139	SWITCH
32	84-803539001	WIRE, Lead
33	84-895122A01	CABLE
34	19-853994	TERMINAL PLUG

▶Fuel Tank Assembly(Plastic - 3.2 Gallon) (6 parts)

Ref	OEM Part #	Part Name
1	1260-859061A1	TANK ASSEMBLY, Fuel (Plastic-3.2 Gallon)
2	823535	GAUGE/CAP ASSEMBLY
3	27-8169771	GASKET, Fuel Cap
4	22-8M0175544	CONNECTOR KIT, Fuel
5	25-823533	O-RING
6	35-823534	SCREEN

▶Gear Housing, Driveshaft (44 parts)

Ref	OEM Part #	Part Name
-	853792A09	REPAIR KIT, Gear Housing Water Pump - Chrome
1	1668-803729A3	GEAR HOUSING ASSEMBLY
2	31-160521	BEARING, Needle
3	22-8M0229353	PLUG
4	27-95220	GASKET
5	97-803731	ANODE
6	10-16832	BOLT
7	16133	STRAINER, Water
8	10-16134	SCREW
9	22-8M0229353	PLUG
10	27-95220	GASKET
11	803730002	STRAINER, Water
12	10-17635	SCREW
13	16-879194301	STUD
14	803762	CLAMP
15	10-898103153	SCREW
16	8M0172382	CAM
17	17-16179	PIN
18	803760009	CAM ROD Comment: Long
19	23-803761	BUSHING
20	25-8537096	O-RING
21	25-161772	O-RING
22	12-8M0135942	WASHER
23	11-400213	NUT, (M8) Stainless Steel
24	11-85372211	NUT
25	11-85372216	NUT
26	46-803750A05	HOUSING, Water Pump
27	26-8036674	SEAL
28	10-823042046	BOLT
29	803751	LINER, Water Pump
30	47-8M0214944	IMPELLER
31	803753	GUIDE PLATE
32	46-803750A04	HOUSING, Water Pump
33	25-8537096	O-RING
34	26-803752	SEAL, Oil
35	15-813276005	SHIM, (0.5)
36	30-16132T05	BEARING, Ball
37	45-803738008	DRIVESHAFT Comment: Long
38	28-8M0173418	KEY
39	43-16138003	GEAR, Pinion
40	851859	CONNECTOR
41	17-952189	PIN, Dowel
42	25-853709007	GROMMET
43	803766005	SHIFT ROD

▶Gear Housing, Propshaft (24 parts)

Ref	OEM Part #	Part Name
-	27-8M0082884	GASKET SET, Lower Unit
1	1668-803729A3	GEAR HOUSING ASSEMBLY
2	30-16132T01	BEARING, Ball
3	43-812944003	GEAR, Forward
4	803747	PUSH ROD
5	853764003	HOLDER
6	24-803746	SPRING
7	52-803745	CLUTCH
8	17-160851	PIN
9	24-176672	SPRING
10	44-8M0088568	PROPELLER SHAFT
11	8M0070877	CARRIER ASSEMBLY, Bearing
12	25-8M0087846	O-RING
13	30-16132T01	BEARING, Ball
14	31-803734	BEARING, Needle
15	26-161622	SEAL, Oil
16	10-823042	BOLT, Stainless Steel
17	12-803742	WASHER
18	43-812945004	GEAR, Reverse
19	8M0143215	THRUST HOLDER
20	48-897752A11	PROPELLER, (10 Pitch) Comment: (10) (Standard Short)
21	12-161402	WASHER
22	11-161471	PROP NUT
23	18-8150264	COTTER PIN

▶Intake Manifold and Fuel Pump (23 parts)

Ref	OEM Part #	Part Name
-	27-835427A05	GASKET SET, Powerhead
1	804887002	MANIFOLD, Inlet
2	27-853525003	GASKET
3	17-16119	PIN, Dowel
4	10-16125	BOLT
5	12-16826	WASHER, Stainless Steel
6	54-953951	CLAMP
7	27-16327002	GASKET, Carburetor
8	853526004	INSULATOR
9	853728003	SILENCER, Air
10	54-95395	CLIP, Stainless Steel
11	25-825057005	O-RING
12	10-855809001	BOLT
13	12-16826	WASHER, Stainless Steel
14	32-851848012	TUBING
15	54-952245	CLAMP
16	803529T04	PUMP, Fuel
17	853731004	DIAPHRAGM SET
18	25-16109003	O-RING
19	10-823042	BOLT
20	32-851848013	TUBING, (320 mm)
21	32-851848006	HOSE, (150 mm)
22	35-8M0157133	FILTER, Fuel

▶Intake Valve and Exhaust Valve (18 parts)

Ref	OEM Part #	Part Name
-	895274A05	POWERHEAD ASSEMBLY
1	850838T02	VALVE, Intake
2	850839003	VALVE, Exhaust
3	26-822647001	SEAL, Intake - Black
4	26-822647002	SEAL, Exhaust - Green
5	24-898101214	SPRING
6	8M0158660	SEAT
7	803555	RETAINER
8	28-803556	COTTER
9	850841004	ROCKER ARM
10	10-825046002	SCREW
11	11-826150001	NUT, Adjusting
12	850842001	ROCKER ARM SHAFT
13	825451001	COLLAR
14	24-825452002	SPRING
15	24-825453001	SPRING
16	12-895118001	WASHER
17	12-895118004	WASHER

▶Recoil Starter (30 parts)

Ref	OEM Part #	Part Name
1	8M0170582	STARTER ASSEMBLY, Recoil
2	803716005	HOUSING, Starter
3	804029	HANDLE, Starter
4	853755002	CAP, Starter Handle
5	24-804024008	SPRING, Starter
6	53-852784001	E RING
7	803717002	REEL
8	50-8M0110715	ROPE, Starter
9	812635T03	RATCHET
10	898101148	RATCHET GUIDE
11	24-812634004	SPRING, Return
12	812638002	PLATE, Friction
13	24-8M0126988	SPRING, Friction
14	10-8M0126987	BOLT
15	804031002	LOCK, Starter
16	24-812645008	SPRING
17	824995005	SEAL, Rubber
18	10-16830	BOLT
19	23-8035731	COLLAR
20	12-953921	WASHER
21	54-8M0130961	CLAMP
22	11-856949002	NUT
23	25-881305006	GROMMET, Rubber
24	23-895162001	COLLAR, Steel
25	24-812645009	SPRING
26	895133T01	COVER, Belt
27	10-16830	BOLT
28	10-16705	BOLT
29	12-953921	WASHER
30	23-952868	COLLAR

▶Service/Support Material (1 parts)

Ref	OEM Part #	Part Name
-	90-895256005	PARTS MANUAL, 15HP Seapro 4-Stroke International

▶Shift Components (30 parts)

Ref	OEM Part #	Part Name
1	895174002	COVER
2	10-879194334	SCREW
3	37-802987001	DECAL, F, N, R
4	853739005	BRACKET
5	10-823042	BOLT
6	25-16823002	GROMMET
7	895176001	BRACKET, Shift Lever
8	10-167051	BOLT, (M6 x 20)
9	804892003	DRUM, Throttle
10	16333	ROD, Snap
11	803574003	ROD, Throttle
12	10-16705	BOLT
13	12-953921	WASHER
14	23-952868	COLLAR
15	803763004	LEVER, Shift
16	23-895126001	COLLAR
17	10-8M0147119	BOLT
18	892774001	ROD, Shift Lever
19	851862002	SHIFT ARM
20	851865002	SHIFT SHAFT
21	24-8M0138736	STOPPER
22	8M0138737	CLAMP
23	10-82304223	BOLT
24	803548001	PLATE
25	10-8248324	BOLT
26	895131A03	CABLE, Starter
27	853817002	BRACKET
28	87-823037A2	SWITCH ASSEMBLY, Stop - Lanyard
29	823054	LANYARD
30	853986001	SEAL

▶Swivel Bracket (30 parts)

Ref	OEM Part #	Part Name
1	3407-813029016	SWIVEL BRACKET
2	23-16336008	BUSHING
3	803774003	THRUST PLATE
4	25-16109003	O-RING
5	22-824969	FITTING, Grease
6	10-895140002	BOLT
7	8M0145395	DISC
8	895172001	PLATE, Co-Pilot
9	10-8248324	BOLT
10	12-895146002	WASHER
11	12-895146001	WASHER
12	895171001	HANDLE, Co-Pilot
13	11-95374001	NUT, Nylon
14	84-898101089	GROUND WIRE
15	10-8230427	BOLT, To Standard Clamp Bracket
16	10-85554410	SCREW
17	8M0102284	BRACKET, Starboard
18	10-879194310	BOLT
19	10-879194309	BOLT
20	803775006	MOUNT, Lower
21	8M0102285	BRACKET, Port
22	10-167051	BOLT, (M6 x 20)
23	97-823913Q	ANODE
24	12-8M0135942	WASHER
25	11-400213	NUT, (M8) Stainless Steel
26	10-879194260	BOLT
27	853770004	SWIVEL TUBE
28	16-895166001	STUD BOLT
29	12-879194340	WASHER, Stainless Steel
30	11-85372212	NUT, Nylon

▶Tiller Handle (25 parts)

Ref	OEM Part #	Part Name
1	803996002	Handle, Steering
2	23-823939001	BUSHING
3	12-822145001	WASHER
4	13-826792001	WAVE WASHER,
5	826648001	PLATE, Handle
6	16-815028	STUD BOLT
7	13-400256	LOCKWASHER, (M6)
8	11-400212	NUT, (M6) Stainless Steel
9	804898001	WIRE, Throttle
10	804019002	BRACKET, Steering
11	10-895140003	BOLT
12	12-168261	WASHER
13	17-16085	PIN
14	16338	BRACKET
15	10-879194329	SCREW
16	813026	FRICTION PIECE
17	10-16087	SCREW, Adjusting
18	12-16826	WASHER, Stainless Steel
19	11-400212	NUT, (M6) Stainless Steel
20	803998002	SHAFT, Throttle
21	853775003	GRIP
22	10-16094	SCREW
23	37-824200005	DECAL, Throttle
24	23-16191	SPACER
25	23-16336	BUSHING

▶Upper Cowl (11 parts)

Ref	OEM Part #	Part Name
-	37-895762A05	DECAL SET
1	114-803580A13	TOP COWL ASSEMBLY
2	16218010	TILT HANDLE
3	895178002	SEAL, Rubber
4	853788002	ROLLER
5	12-953921	WASHER
6	53-953181	E RING
7	12-953921	WASHER
8	13-400256	LOCKWASHER, (M6)
9	11-400212	NUT, (M6) Stainless Steel
10	NSS	NOT SOLD SEPARATE, Decal-Oil Pressure

100-Hour / Annual Service Checklist

Regular maintenance keeps your Mercury 15 SEAPRO (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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Mercury 15 SEAPRO (4-STROKE) (0R051685 THRU 0R123564) Parts & Diagrams

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