Mercury 250 PRO XS (3.0L DFI) (1B426561 THRU 1B752546) Parts & Diagrams

🔎 Mercury 250 PRO XS (3.0L DFI) Reference Library — Exploded parts diagrams (29 diagrams), specifications, common issues, and maintenance checklist.

The Mercury 250 PRO XS (3.0L DFI) is a 4-Stroke, V8 64-degree, DOHC, 32-valve outboard motor. Designed for large center-consoles, offshore sport-fishing boats, and multi-engine configurations.

Quick Reference Specifications

Specification	Value
Engine Type	4-Stroke, V8 64-degree, DOHC, 32-valve
Horsepower	250 HP
Displacement	4600 cc (4.6L / 279 CID)
Bore x Stroke	92 mm x 86 mm (3.62 in. x 3.38 in.)
Spark Plug (Type & Gap)	NGK LKAR7C-9
Engine Oil Capacity	7.0 L (7.4 qt)
Recommended Engine Oil	Mercury FourStroke Oil 25W-40 (NMMA FC-W SAE 10W-30)
Gear Case Oil Capacity	802 mL (27.1 oz)
Idle Speed (in gear)	600 RPM
Full Throttle RPM Range	5200-6000
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 250 PRO XS (3.0L DFI):

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 250 PRO XS (3.0L DFI).

▶Air Compressor Components (31 parts)

Ref	OEM Part #	Part Name
-	25-832804A03	O-RING KIT
1	8M0060051	COMPRESSOR ASSEMBLY, Air Comment: Unpainted
2	1100-8M0050793	END CAP ASSEMBLY
3	NSS	NOT SOLD SEPARATE, Snap Ring
4	10-85593920	SCREW, (M6 x 20)
5	25-89224001	O-RING
6	25-67206001	O-RING
7	653-833146T06	CONNECTING ROD ASSEMBLY
8	NSS	NOT SOLD SEPARATE, Piston Assembly
9	53-8348101	RING, Lock
10	835088A10	REED PLATE ASSEMBLY
11	25-67207	O-RING, (3.489 x .070)
12	25-832804	O-RING, (2.739 x .070)
13	26-828225	SEAL
14	835087A3	HEAD ASSEMBLY, Compressor
15	22-8307535	FITTING, Straight
16	10-82127335	SCREW, (M8 x 35 MM)
17	22-151331	FITTING
18	22-996642	FITTING, Elbow 90 Degree (.125-27 x .250) Nylon
19	21-428641	FITTING, Check Valve
20	22-856744	FITTING
21	22-16604	FITTING, Straight (.125-27)
22	25-831985	O-RING, (.468 x .078)
23	13536A14	SENSOR ASSEMBLY, Temperature
24	137151	RETAINER
25	10-81893414	SCREW, (M8 x 14)
26	22-390721	PLUG, Pipe (.125-27) Brass
27	10-85593920	SCREW, (M6 x 20)
28	8M0138680	PULLEY
29	10-8M0045380	SCREW, (M8 x 50)
30	12-884594	WASHER

▶Air Handler (53 parts)

Ref	OEM Part #	Part Name
-	61-841017A52	POWERHEAD ASSEMBLY
1	858541T4	ADAPTOR PLATE
2	27-841220	GASKET
3	840418T04	REED BLOCK ASSEMBLY
4	34-840445A04	REED PETAL ASSEMBLY
5	10-849038	SCREW, (M3 x 5)
6	840447	REED PLATE
7	10-8555252	SCREW, (M6)
8	23-855364	BUSHING
9	25-855362001	GROMMET
10	12-817274	WASHER, (.344 x 1.00 x .063) Stainless Steel
11	10-81893435	SCREW, (M8 x 35)
12	8M0001447	BRACKET
13	858708T1	PLENUM KIT, Air
14	27-804679004	GASKET
15	10-883942	SCREW, (M4 x 16)
16	54-816311T	TIE STRAP, (8.00 Inches)
17	54-804842	CLAMP
18	8M0185614	PUMP ASSEMBLY, Oil
19	854445	SENSOR, MAP
20	884522	BRACKET, MAP Sensor
21	10-1993716	SCREW, (M6 x 16)
22	8M0148668	SENSOR ASSEMBLY
23	25-896699	O-RING, (1.78 mm x .08 mm)
24	841194T04	THROTTLE BODY ASSEMBLY
25	23-891774	BUSHING
26	853659A01	LEVER KIT, Throttle
27	858851A03	LEVER ASSEMBLY, Throttle
28	8M0072162	ROLLER
29	12-8M0204666	WASHER, (.203 x .500 x .032)
30	8-32,11-826709104	NUT, Stainless Steel
31	10-889354	SCREW, Special
32	12-881991	WASHER, Cupped
33	12-881992	WASHER, Spool
34	10,13-69432	LOCKWASHER, External
35	10-82130040	SCREW, (M6 x 40)
36	25-855426	O-RING
37	8M0111168	COVER
38	25-86361	GROMMET
39	25-13467	GROMMET, (.88 Inside Diameter)
40	25-8M0153609	GROMMET
41	37-881865	DECAL, Caution-Start in Gear
42	854343T11	ATTENUATOR, Air
43	10-82130050	SCREW, (M6 x 50)
44	12-69056	WASHER, (.255 x .620 x .030) Stainless Steel
45	54-858902	CLAMP
46	12-8M0204649	WASHER, (.281 x .500 x .060) Stainless Steel
47	10-82130040	SCREW, (M6 x 40)
48	12-8M0204649	WASHER, (.281 x .500 x .060) Stainless Steel
49	881879T25	SENSOR ASSEMBLY, Pitot
50	881879T11	SENSOR, Pressure (0 - 100 PSI)
51	22-8M0207782	FITTING
52	54-883066	CLIP, (.865)

▶Air Hoses (11 parts)

Ref	OEM Part #	Part Name
-	61-841017A52	POWERHEAD ASSEMBLY
1	22-856842	ELBOW
2	54-816311T	TIE STRAP, (8.00 Inches)
3	32-8M0108349	TUBING, (.312) (70.00 Inches Bulk) (Cut to 8 Inches)
4	54-8M0214964	CLAMP, Hose (15.3)
5	32-8567631	HOSE ASSEMBLY
6	32-889314	HOSE, Air By-Pass
7	32-804829	HOSE ASSEMBLY, Air Balance
8	32-8M0116380	HOSE/SLEEVE
9	22-875271	FITTING, 90 Degree - Brass (.125-27)
10	32-887630	HOSE, Molded

▶Bottom Cowl (26 parts)

Ref	OEM Part #	Part Name
1	100-8M0107324	BOTTOM COWL, Port
2	854367001	PLUG
3	100-8M0107323	BOTTOM COWL, Starboard
4	27-889246A97	GASKET KIT
5	10-82130040	SCREW, (M6 x 40)
6	10-824868	SCREW, (M6 x 75)
7	12-8M0204649	WASHER, (.281 x .500 x .060) Stainless Steel
8	8M0053903	FRONT HANDLE
9	23-335891	BUSHING
10	25-48462	O-RING, (.614 x .070)
11	8219423	PAWL
12	12-69057	WASHER, (.281 x .734 x .063)
13	11-401366	NUT, (M6) Stainless Steel
14	10-8214281	SCREW, (#10-16 x .625)
15	54-822873	CLIP
16	87-8M0235191	SWITCH, Trim
17	32-842756T01	RIGGING KIT
18	842744002	BRACKET
19	10-82130012	SCREW, (M6 x 12)
20	843185T02	COUPLER
21	32-842756005	HOSE
22	843174002	COUPLER
23	10-47994	SCREW, (#10 x 1.50)
24	852361T02	HANDLE Comment: SN# 1B447000 & Up
25	13-29402	WAVE WASHER Comment: SN# 1B446999 & Below
26	8M0109222	SEAL

▶Coil Plate (25 parts)

Ref	OEM Part #	Part Name
-	NSS	NOT SOLD SEPARATE, Coil Mounting Plate Assembly-Complete
1	884272T	PLATE, Coil Mounting
2	300-8M0077471	COIL KIT
3	10-82129130	SCREW, (M6 x 30)
4	84-881908T	CABLE SET
5	84-858414A1	CABLE ASSEMBLY, Braided
6	10-82129110	SCREW, (M6 x 10)
7	12-8M0204649	WASHER, (.281 x .500 x .060) Stainless Steel
8	25-833155	GROMMET
9	23-8502341	BUSHING
10	881879T26	SENSOR ASSEMBLY, Pressure
11	22-8M0207782	FITTING
12	54-883066	CLIP, (.865)
13	32-85978571	TUBING, (52.00 Inches Bulk) (Cut to 18 Inches)
14	84-892972T04	HARNESS ASSEMBLY, Coil
15	54-879962	CLIP
16	10-81893435	SCREW, (M8 x 35)
17	12-4002318	WASHER
18	22-881866	FITTING
19	22-875207	TEE, Fitting
20	54-816311T	TIE STRAP, (8.00 Inches)
21	54-8M0024808	J CLIP
22	33-843220Q	SPARK PLUG
23	32-85978571	TUBING, (52.00 Inches Bulk) (Cut to 5 Inches)
24	32-85944975	TUBING, (72.00 Inches Bulk) (Cut to 52 Inches)

▶Crankshaft, Pistons and Connecting Rods (21 parts)

Ref	OEM Part #	Part Name
-	61-841017A52	POWERHEAD ASSEMBLY
1	482-842753A02	CRANKSHAFT ASSEMBLY
2	830882	WEAR SLEEVE
3	30-67923T	BEARING, Ball (Lower)
4	53-67446	RING
5	39-843198T01	RING, Seal
6	28-91800	KEY, Woodruff
7	25-35126	O-RING, (.859 x .139)
8	31-88270A02	BEARING/RACE KIT
9	31-88269T	BEARING ASSEMBLY
10	2720-842986T03	PISTON ASSEMBLY Comment: (Port)
11	40-841202	RING
12	39-858772A02	RING SET, Piston
13	8M8023292	CYLINDER
14	10-94320	SCREW, (.375-24 x 1.250)
15	31-844338A01	BEARING ASSEMBLY
16	12-88263	THRUST WASHER
17	29-8M0204715	BEARING, Needle
18	31-816773A2	BEARING ASSEMBLY (Upper)
19	26-859093	SEAL
20	25-823683	O-RING, (1.989 x .070)

▶Cylinder Block and End Cap (47 parts)

Ref	OEM Part #	Part Name
-	27-841220A03	GASKET SET, Powerhead
1	885-9811T72	CYLINDER BLOCK ASSEMBLY
2	10-81893440	SCREW, (M8 x 40)
3	8M0111325	BRACKET
4	16-903509	STUD, (M10 x 1.5 x 64)
5	16-8154431	STUD, (M10 x 1.5 x 155)
6	17-63779	PIN, Dowel (.250 x .625)
7	21-8781051	CHECK VALVE
8	17-8M0036405	PIN
9	17-43044	PIN, Dowel - Without Hole (.375 x .625)
10	22-8245021	CONNECTOR
11	10-81893435	SCREW, (M8 x 35)
12	10-82446180	SCREW, (M10 x 80)
13	8248577	DEFLECTOR
14	10-82494810	SCREW, (M6 x 10)
15	12-8M0214963	WASHER, (.406 x .750 x .105) Stainless Steel
16	11-4013610	NUT, (M10) Stainless Steel
17	8M0082988	SENSOR
18	10-40011107	SCREW, (M5 x 16) Stainless Steel
19	1171-9787A4	END CAP ASSEMBLY
20	25-62700	O-RING, (3.237 x .103)
21	26-8308981	SEAL
22	10-82130020	SCREW, (M6 x 20)
23	10-82130012	SCREW, (M6 x 12)
24	23-421581	BUSHING
25	8215832	PIN, Special (1.5 Inches)
26	900-841020A08	CYLINDER HEAD ASSEMBLY, Port
27	818574	SEAL
28	884391	SEAL
29	10-8M0045380	SCREW, (M8 x 50)
30	8M0057307	THERMOSTAT, 54 Degree C/130 Degree F
31	27-8503181	GASKET
32	887602002	COVER, Thermostat Comment: (Starboard)
33	10-82130025	SCREW, (M6 x 25)
34	22-328022	PLUG, Pipe (.125-27) Brass
35	8M0148668	SENSOR ASSEMBLY
36	25-896699	O-RING, (1.78 mm x .08 mm)
37	857186T02	PLATE ASSEMBLY
38	23-855729	MOUNT
39	10-82130145	SCREW, (M10 x 45)
40	25-19565002	GROMMET
41	12-855725	WASHER
42	54-8M0024808	J CLIP
43	54-858424	CLAMP
44	12-8M0204649	WASHER, (.281 x .500 x .060) Stainless Steel
45	10-82130016	SCREW, (M6 x 16)
46	54-858951	J CLIP

▶Drivehshaft Housing and Exhaust Tube (28 parts)

Ref	OEM Part #	Part Name
1	3519-832938A06	HOUSING ASSEMBLY, Driveshaft Comment: (X-Long)
2	16-8M0008031	STUD, (M12 x 52)
3	10-892860	SCREW, (M12 x 35)
4	25-8331231	GROMMET
5	12-856982	WASHER, (.500 x .810 x .090) Stainless Steel
6	11-896895	NUT, (M12)
7	19-64649	PLUG
8	10-898834	BOLT, (M14 x 178)
9	88238A10	CABLE ASSEMBLY, Ground
10	12-815432	WASHER, (.562 x 2.00 x .125)
11	8M0050840	MOUNT (Lower) Comment: (X-Long)
12	12-825190	WASHER
13	11-896602	NUT, (M14)
14	8186442	CLAMP
15	10-8M0084475	SCREW, (M8 x 40)
16	12-847541	WASHER
17	8M0001136	COVER, Lower Mount
18	10-69079	SCREW, (#10-16 x .440)
19	8329321	SEAL
20	833116A19	TUBE ASSEMBLY, Exhaust
21	35-8M0026113	STRAINER
22	10-81893435	SCREW, (M8 x 35)
23	32-8M0042786	TUBE, Water Comment: (X-Long)
24	832940001	SEAL
25	8329391	CLAMP
26	10-41508	SCREW, (.250-20 x .500) Stainless Steel
27	10-81893435	SCREW, (M8 x 35)
28	13-72521	LOCKWASHER, Internal Tooth

▶Electrical Plate Components (28 parts)

Ref	OEM Part #	Part Name
-	879346A41	HARNESS ASSEMBLY, Throttle Position Sensor
1	899071T01	PLATE
2	54-899145	CLIP, Tie Strap
3	10-82129114	SCREW, (M6 x 14)
4	12-8M0204649	WASHER, (.281 x .500 x .060) Stainless Steel
5	8M0207773	RELAY ASSEMBLY
6	828102	BRACKET
7	25-818967	GROMMET
8	23-8M0214955	BUSHING
9	10-82129125	SCREW, (M6 x 25 MM)
10	84-892971T05	HARNESS ASSEMBLY, Engine
11	85-875302A1	HOT STUD ASSEMBLY
12	54-816311T	TIE STRAP, (8.00 Inches)
13	12-85172	WASHER
14	84-93388T21	CABLE ASSEMBLY, Black
15	84-93388A17	CABLE ASSEMBLY, (8.50 Inches)
16	84-878231A6	HARNESS ASSEMBLY, Fuse - 100 Ampere
17	13-53166	LOCKWASHER, (.312)
18	11-400213	NUT, (M8) Stainless Steel
19	84-88439A46	CABLE ASSEMBLY, Battery - Positive
20	89-817109A2	SOLENOID ASSEMBLY, (#10-32 / .3125-18 Terminals)
21	25-822179	GROMMET
22	23-8M0214955	BUSHING
23	84-88807A16	CABLE ASSEMBLY, (4.00 Inches) Black
24	10-32,11-45076	NUT, Brass
25	10-32,11-813938	CAP NUT,
26	11-8M0204668	NUT, (.312-18)
27	84-819514T26	HARNESS ASSEMBLY, Trim

▶Exhaust Plate (38 parts)

Ref	OEM Part #	Part Name
-	27-841220A03	GASKET SET, Powerhead
1	832935A17	PLATE ASSEMBLY, Exhaust
2	27-832933006	GASKET
3	27-832934006	GASKET (Lower)
4	8M0043157	SEAL
5	22-8320761	FITTING, Check Valve
6	25-30641	O-RING, (.299 x .103)
7	8219631	CHECK VALVE
8	21-817519A1	CHECK VALVE ASSEMBLY, Drain
9	17-43044	PIN, Dowel - Without Hole (.375 x .625)
10	22-887603	FITTING
11	65663A2	COVER ASSEMBLY (Includes Reference #18)
12	10-81893435	SCREW, (M8 x 35)
13	814190	CARRIER
14	25-814191	GROMMET
15	814189	POPPET
16	24-64878	SPRING, (Black)
17	65664A1	PLATE ASSEMBLY
18	27-88907003	GASKET
19	648771	DIAPHRAGM
20	12-76451	WASHER
21	10-69570	SCREW, (#10-16 x .750)
22	43585	COUPLING
23	25-822002	GROMMET
24	22-94848	FITTING
25	10-81893435	SCREW, (M8 x 35)
26	850306A04	BOOT KIT, Idle Exhaust
27	888910	PLATE
28	10-82239312	SCREW, (M5 x 12)
29	19-821908	PLUG
30	12-821915	WASHER
31	32-859626A1	FLUSH HOSE KIT (Inlet)
32	22-8596001	FITTING
33	54-850896	CLAMP, (28.6)
34	22-8M0077650	FITTING, Tell-Tale
35	35-8348084	STRAINER
36	23-48237	BUSHING
37	25-12602002	GROMMET

▶Flywheel/Alternator (19 parts)

Ref	OEM Part #	Part Name
1	8M6013461	ALTERNATOR
2	24-8523742	SPRING
3	11-400636	NUT
4	856815T2	ARM TENSIONER ASSEMBLY
5	12-4002320	WASHER
6	16-8M0063255	STUD, M10x92 Comment: ProXS
7	23-8568941	BUSHING
8	8M6005030	PULLEY ASSEMBLY
9	10-4010835	SCREW, (M10 x 35) Hex Flange - Stainless Steel
10	57-828507Q5	BELT
11	283-859619T1	FLYWHEEL
12	11-42979	NUT, (M16)
13	12-33001	WASHER, (.641 x 1.250 x .190)
14	12-47533	WASHER, Thermostat
15	11-401386	NUT, (M6) Stainless Steel
16	84-856583A5	CABLE ASSEMBLY, To Block
17	12-4002319	WASHER
18	10-82130150	SCREW, (M10 x 50)
19	19-45907	PLUG, Yellow

▶Fuel Pump (23 parts)

Ref	OEM Part #	Part Name
-	27-841220A03	GASKET SET, Powerhead
1	NSS	NOT SOLD SEPARATE, Fuel Pump
2	21-857005A1	DIAPHRAGM KIT
3	NSS	NOT SOLD SEPARATE, Diaphragm
4	NSS	NOT SOLD SEPARATE, Retainer
5	NSS	NOT SOLD SEPARATE, Spring
6	NSS	NOT SOLD SEPARATE, Cap
7	NSS	NOT SOLD SEPARATE, Spring
8	NSS	NOT SOLD SEPARATE, Cap
9	NSS	NOT SOLD SEPARATE, Diaphragm
10	NSS	NOT SOLD SEPARATE, Gasket-Boost
11	NSS	NOT SOLD SEPARATE, Gasket-Pulse
12	25-8M0204683	O-RING, (.301 x .070)
13	987752	PLATE
14	22-996642	FITTING, Elbow 90 Degree (.125-27 x .250) Nylon
15	10-82104540	SCREW, (M5 x 40), Fuel Pump
16	10-82130050	SCREW, (M6 x 50), Pump to Crankcase
17	144303	BASE
18	22-782792	FITTING, Elbow 45 Degree (1.25)
19	22-888493	ELBOW
20	22-822769	CONNECTOR
21	54-816311T	TIE STRAP, (8.00 Inches)
22	32-8M0043979	HOSE AND SLEEVE ASSEMBLY, (18.00 Inches)

▶Fuel System (39 parts)

Ref	OEM Part #	Part Name
-	8M0185156	FUEL RAIL ASSEMBLY, Complete
NS	25-804840	O-RING KIT
1	NSS	NOT SOLD SEPARATE, Fuel Rail (Port)
2	NSS	NOT SOLD SEPARATE, Fuel Rail (Starboard)
3	54-804830	CLAMP
4	10-804525001	SCREW PACKAGE, (2 Per)(M5 x 10)
5	8M0047053	VALVE ASSEMBLY, (.375 Inch Diameter)
6	25-804840	O-RING KIT
7	22-805515	CAP, Shrader Valve - Brass
8	19-804835	PLUG
9	8M0041097	CLAMP
10	54-8048311	CLAMP
11	8M0222157	INJECTOR
12	25-804530	O-RING KIT
13	25-804529	O-RING KIT
14	804522	CLAMP
15	804532	O-RING KIT (16 per Kit
16	54-804832	CLAMP
17	804526	SCREW PACKAGE, (M5 x 16) (2 Per)
18	804535001	COVER
19	24-804534001	SPRING
20	804533	DIAPHRAGM ASSEMBLY
21	25-804536	O-RING
22	22-804836	FITTING
23	32-804827	HOSE
24	32-889310	HOSE, Fuel Supply
25	32-889311	HOSE, Fuel By Pass
26	26-888852	SEAL, Fuel Director
27	8M6001744	INJECTOR ASSEMBLY, Air
28	26-804875	SEAL KIT
29	12-859404002	WASHER, Injection
30	828791	CLIP
31	16-8M0063255	STUD, (M10 x 91)
32	11-826292	NUT, (M10) Brass/Nickel Plated
33	54-8M0214964	CLAMP, Hose (15.3)
34	32-8M0043979	HOSE AND SLEEVE ASSEMBLY, (18.00 Inches)
35	22-822769	CONNECTOR
36	54-816311T	TIE STRAP, (8.00 Inches)
37	54-899145	CLIP, Tie Strap

▶Gear Housing(Driveshaft - TorqueMaster) (47 parts)

Ref	OEM Part #	Part Name
-	26-816575A6	SEAL KIT, Gear Housing
1	1689-842739T16	GEAR HOUSING ASSEMBLY, Basic (Black) Comment: SN# 1B465109 & Up
2	17-379721	PIN
3	821526001	FILLER BLOCK
4	97-826134Q	ANODE
5	10-4000333	SCREW, (M6 x 40)
6	11-401386	NUT, (M6) Stainless Steel
7	31-42647A1	BEARING ASSEMBLY, Roller
8	17-43044	PIN, Dowel - Without Hole (.375 x .625)
9	10-79953Q04	SCREW KIT, Drain
10	26-8M0204693	SEAL
11	859402	PITOT TUBE
12	26-8M0204708	SEAL, Oil
13	22-881866	FITTING
14	858934	COVER
15	27-858935	GASKET
16	25-896522	O-RING, (799 x .103) Comment: SN# 1B465109 & Up
17	10-1993716	SCREW, (M6 x 16) Comment: SN# 1B465109 & Up
18	10-1993716	SCREW, (M6 x 16) Comment: SN# 1B465109 & Up
19	NSS	NOT SOLD SEPARATE, Pinion Gear Comment: (Part of Forward Gear Kit)
20	12-92721	WASHER
21	11-35921	NUT, (.625-18)
22	12-77674	WASHER
23	824145	SHIFT SHAFT
24	28-8M0204723	KEY
25	45-881942	DRIVESHAFT Comment: (X-Long)
26	15-8M0063268	SHIM ASSEMBLY
27	31-8M0146553	BEARING, Tapered Roller
28	NSS	NOT SOLD SEPARATE, Cup
29	15-42637A1	SHIM SET
30	31-8M0146566	BEARING ASSEMBLY, Roller/Cup
31	NSS	NOT SOLD SEPARATE, Cup
32	8245191	RETAINER
33	8M0192207	CARRIER ASSEMBLY
34	25-8M0142854	O-RING, (2.175 x .175)
35	26-8M0214939	SEAL, Oil
36	26-8M0214939	SEAL, Oil
37	10-1993716	SCREW, (M6 x 16) Comment: SN# 1B465109 & Up
38	817275A1	HOUSING KIT, Water Pump
39	26-816575A2	SEAL KIT
40	27-430331	GASKET
41	27-8172771	GASKET
42	8M0204709	FACEPLATE
43	47-43026T2	IMPELLER
44	832942A1	COUPLING ASSEMBLY
45	25-8M0204645	O-RING, (.796 x .139)
46	25-8M0204654	O-RING, (1.046)

▶Gear Housing, Propeller Shaft - TorqueMaster (35 parts)

Ref	OEM Part #	Part Name
-	26-816575A6	SEAL KIT, Gear Housing
1	1689-842739T16	GEAR HOUSING ASSEMBLY, Basic (Black) Comment: SN# 1B465109 & Up
2	22-859403	PLUG
3	8M0226861	SHIFT CRANK
4	8M0235940	SPOOL ASSEMBLY
5	NSS	NOT SOLD SEPARATE, Spool
6	NSS	NOT SOLD SEPARATE, Sleeve
7	NSS	NOT SOLD SEPARATE, Cotter Pin
8	15-47397A1	SHIM SET
9	43-859321T04	GEAR SET, Forward/Pinion
10	31-828437A2	BEARING ASSEMBLY
11	NSS	NOT SOLD SEPARATE, Cup
12	31-30895T	BEARING, Needle
13	53-856823	RING, Retaining
14	52-848878T	CLUTCH
15	17-78909	PIN, Detent
16	17-848838	PIN, Cross
17	24-78962	SPRING
18	44-841978	PROPELLER SHAFT
19	43-8M0192235	GEAR, Reverse
20	23-8241081	THRUST SPACER
21	30-88957T	BEARING, Ball
22	681001	RING, Thrust
23	25-8M0142840	O-RING, (3.850 x .210) Comment: SN# 1B465109 & Up
24	848840A1	CARRIER ASSEMBLY, Bearing
25	31-817072	BEARING, Roller
26	53-817071	RING, Snap
27	26-815565	SEAL, Oil
28	28-30281	KEY
29	10-79953Q04	SCREW KIT, Drain Comment: SN# 1B465109 & Up
30	26-8M0204693	SEAL
31	14-79447	TAB WASHER
32	8M2011027	RETAINER
33	97-76214Q5	ANODE
34	10-66024	SCREW, (.437-14 x 1.75)

▶Oiling System (37 parts)

Ref	OEM Part #	Part Name
1	32-8M0054152	TUBING, (38.00 Inches Bulk) (Cut to 11.50 Inches)
2	32-8M0054152	TUBING, (38.00 Inches Bulk) (Cut to 5 Inches)
3	35-8M0207786	FILTER, Fuel
4	32-8M0054152	TUBING, (38.00 Inches Bulk) (Cut to 9 Inches)
5	1200-8M0064075	TANK, Oil
6	NSS	NOT SOLD SEPARATE, Decal-Reservoir
7	25-855362001	GROMMET
8	23-855364	BUSHING
9	23-883050	SPACER
10	10-58376	SCREW, (.164-18 x .375)
11	12-72761	WASHER, (.203 x .562 x .060) Stainless Steel
12	87-856156T04	SWITCH
13	32-885553	HOSE
14	22-8M0207780	FITTING
15	19-887609	PLUG
16	12-4002318	WASHER
17	10-81893435	SCREW, (M8 x 35)
18	54-816311T	TIE STRAP, (8.00 Inches)
19	32-8752891	HOSE
20	22-858955	CONNECTOR
21	32-875283	HOSE, (2.00 Inches)
22	35-875284T01	FILTER, Oil - In Line
23	NSS	NOT SOLD SEPARATE, Plug
24	32-892830053	HOSE, (24.00 Inches Braided) (Cut to 22 Inches)
25	10-81893460	SCREW, (M8 x 60)
26	21-858870	CHECK VALVE
27	859230T	RETAINER
28	32-8M0054213	HOSE, (40.00 Inches Bulk) (Cut to 34 Inches)
29	32-8M0054152	TUBING, (38.00 Inches Bulk) (Cut to 19.50 Inches)
30	56762	TIE STRAP, (4.00 Inches)
31	32-8M0054152	TUBING, (38.00 Inches Bulk) (Cut to 11 Inches)
32	32-8M0054152	TUBING, (38.00 Inches Bulk) (Cut to 6 Inches)
33	32-8M0054152	TUBING, (38.00 Inches Bulk) (Cut to 4 Inches)
34	22-883988	ELBOW
35	32-8M0054152	TUBING, (38.00 Inches Bulk) (Cut to 22 Inches)
36	32-8M0054152	TUBING, (38.00 Inches Bulk) (Cut to 16.50 Inches)
37	32-8M0054152	TUBING, (38.00 Inches Bulk) (Cut to 7 Inches)

▶PCM Mounting (15 parts)

Ref	OEM Part #	Part Name
1	89790649T	PCM, Propulsion Control Module
2	10-82130025	SCREW, (M6 x 25)
3	12-65567	WASHER, (.265 x .750 x .048) Stainless Steel
4	25-8M0190980	GROMMET
5	23-856954	BUSHING
6	54-891520001	CLIP
7	10-82129114	SCREW, (M6 x 14)
8	10-82130012	SCREW, (M6 x 12)
9	13541	PLUG, Male
10	84-88439A26	CABLE ASSEMBLY, Battery - Negative
11	10-81893420	SCREW, (M8 x 20)
12	830796A04	CONNECTOR ASSEMBLY, Weather Cap - Male
13	877613A02	CONNECTOR ASSEMBLY, Weather Cap 6 Pin
14	881176A1	CAP ASSEMBLY, 3 Position-Male Connector
15	54-816311T	TIE STRAP, (8.00 Inches)

▶Port Center Main Oiling System (13 parts)

Ref	OEM Part #	Part Name
-	61-841017A52	POWERHEAD ASSEMBLY
1	22-887801	FITTING, Elbow 90 Degree (.0625-27)
2	22-887801	FITTING, Elbow 90 Degree (.0625-27)
3	32-8M0054152	TUBING, (38.00 Inches Bulk) (Cut to 20.50 Inches)
4	32-8M0054152	TUBING, (38.00 Inches Bulk) (Cut to 5 Inches)
5	21-8592352	CHECK VALVE, 90 Degree (.0625-27)
6	32-8M0054152	TUBING, (38.00 Inches Bulk) (Cut to 13 Inches)
7	21-8282182	CHECK VALVE
8	21-8582362	CHECK VALVE
9	54-23567	CLIP
10	10-878608	SCREW, (#10-16 x .500)
11	32-8M0054152	TUBING, (38.00 Inches Bulk) (Cut to 11 Inches)
12	32-8M0054152	TUBING, (38.00 Inches Bulk) (Cut to 9.50 Inches)

▶Power Trim Components (38 parts)

Ref	OEM Part #	Part Name
-	25-878285	O-RING
1	878265A4	TRIM MOTOR
2	NSS	NOT SOLD SEPARATE, Armature
3	NSS	NOT SOLD SEPARATE, End Frame
4	10-82494830	SCREW, (M6 x 30)
5	13-400256	LOCKWASHER, (M6)
6	8782451	DRIVESHAFT
7	878410A1	PO CHECK KIT
8	893929A01	MANUAL RELEASE ASSEMBLY (Includes Reference #26)
9	8M0142997	SHAFT KIT
10	17-878267	PIN
11	878235A03	TILT CYLINDER ASSEMBLY
12	878239A02	GUIDE KIT (Includes Reference #26)
13	8M0142999	O-RING KIT (Includes Reference #26)
14	8M0168219	SHOCK ROD KIT (Includes Reference #26)
15	8M0143000	PISTON ASSEMBLY, Memory
16	878406A02	REPAIR KIT, Check Valve (Includes Reference #26)
17	878414T01	PISTON ASSEMBLY
18	878413A1	PISTON ASSEMBLY
19	1100-8M0021648	GUIDE ASSEMBLY
20	878264A1	RESERVOIR KIT
21	19-811613	PLUG ASSEMBLY
22	10-4000327	SCREW, (M6 x 14)
23	12-4002315	WASHER
24	892251A01	PUMP KIT
25	878408A1	REPAIR KIT, Power Trim
26	17-821539	PIN, Trilobe
27	10-858771	SCREW, (M10 x 30)
28	12-4002319	WASHER
29	97-818298Q1	ANODE KIT
30	10-8M0204707	SCREW, (M6 x 25)
31	12-8M0204649	WASHER, (.281 x .500 x .060) Stainless Steel
32	99625002	SHAFT
33	8M0084613	C WASHER
34	54-26550	CLAMP
35	10-878609	SCREW, (#10-16 x .600)
36	32-828547353	CONDUIT, (.350 Inside Diameter x 3.00 Feet Bulk) (Cut to 12 Inches)
37	54-816311T	TIE STRAP, (8.00 Inches)

▶Powerhead Gasket Set Components (1 parts)

Ref	OEM Part #	Part Name
-	27-88907003	GASKET, Relief Valve Cover and Plate

▶Service/Support Material (1 parts)

Ref	OEM Part #	Part Name
-	37-898246A08	DECAL, EPA Label Information Comment: (2008)

▶Starboard Center Main Oiling System (8 parts)

Ref	OEM Part #	Part Name
-	61-841017A52	POWERHEAD ASSEMBLY
1	32-8M0054152	TUBING, (38.00 Inches Bulk) (Cut to 15.50 Inches)
2	21-8592352	CHECK VALVE, 90 Degree (.0625-27)
3	32-8M0054152	TUBING, (38.00 Inches Bulk) (Cut to 16.50 Inches)
4	32-8M0054152	TUBING, (38.00 Inches Bulk) (Cut to 15 Inches)
5	54-23567	CLIP
6	10-878608	SCREW, (#10-16 x .500)
7	22-887801	FITTING, Elbow 90 Degree (.0625-27)

▶Starter Motor (14 parts)

Ref	OEM Part #	Part Name
1	50-892339T01	STARTER MOTOR ASSEMBLY
2	NSS	NOT SOLD SEPARATE, Thru Bolt
3	43-880805A1	GEAR KIT
4	809463A1	SOLENOID KIT
5	8M0065258	BRUSH SET
6	10-69035	SCREW AND LOCKWASHER, (.250-20 x .625) Stainless Steel
7	84-93388A1	CABLE ASSEMBLY, (6.00 Inches) Black
8	37-8272822	DECAL, Warning
9	13-400255	LOCKWASHER, (M5)
10	11-400211	NUT, (M5) Stainless Steel
11	13-8M0204647	LOCKWASHER, (.312)
12	11-400213	NUT, (M8) Stainless Steel
13	23-8M0034918	COLLAR
14	8M0043276	STOP

▶Swivel Bracket and Steering Arm (31 parts)

Ref	OEM Part #	Part Name
1	1499-8M0102865	SWIVEL BRACKET ASSEMBLY, Black
2	25-8M0214926	O-RING
3	23-818764	BUSHING
4	23-816039	SPACER
5	26-87735	SEAL, Oil (Lower)
6	22-8M0169589	FITTING, Grease
7	23-821207	BUSHING
8	12-816432	THRUST WASHER
9	826364T	YOKE, Bottom
10	53-67684	RING, Retaining
11	8M0045383	STRIKER PLATE
12	13-58643	LOCKWASHER, (.375)
13	11-46335	NUT, (.375-24)
14	10-64014	SCREW, (.250-28 x .500)
15	NSS	NOT SOLD SEPARATE, Decal-Serial Overlaminate
16	8M0074846	SENDER ASSEMBLY, Trim
17	10-852368	SCREW, (#10-24 x .750)
18	10,13-26996	LOCKWASHER, Stainless Steel
19	12-89302	WASHER, (.203 x .406 x .040)
20	17-8M0132731	SWIVEL PIN ASSEMBLY, Steering Arm - Stainless Steel
21	10-8M0141069	SCREW, (M12 x 190)
22	824998001	BUMPER
23	8M0051214	MOUNT, Upper - Blue Stripe Comment: (X-Long)
25	12-4002321	WASHER, (12.80 mm x 24.0 mm x 2.4 mm) Stainless Steel
26	11-896963	NUT, (M12)
27	8M0036783	CLAMP
28	10-81893435	SCREW, (M8 x 35)
29	92876A12	LINK ROD ASSEMBLY
30	10-849838	SCREW, (.375-24 x 1.250)
31	11-8M0204726	NUT, (.375-24) Stainless Steel
32	12-37828	WASHER, (.390 x .625 x .062) Stainless Steel

▶Throttle Linkage (46 parts)

Ref	OEM Part #	Part Name
1	8M0040987	LEVER
2	10-81893460	SCREW, (M8 x 60)
3	23-887605	BUSHING
4	23-821113	BUSHING
5	10-40124	SCREW, (M6 x 55)
6	11-400212	NUT, (M6) Stainless Steel
7	42942	CAP
8	42927	INSERT
9	11-401386	NUT, (M6) Stainless Steel
10	23-8M0215006	BUSHING
11	884834	LINK
12	824010T05	BRACKET, Anchor
13	824016	LATCH
14	10-42975	DRIVE SCREW
15	824015	CUP, Barrel Retainer
16	10-82155025	SCREW, (M8 x 25 MM) Stainless Steel
17	12-43430	WASHER
18	10-82155025	SCREW, (M8 x 25 MM) Stainless Steel
19	8M0039052	BRACKET, Slide
20	87-8M0207794	SWITCH
21	54-816311T	TIE STRAP, (8.00 Inches)
22	10-82470620	SCREW, (M3.5 x 20)
23	12-35459	WASHER
24	883142A03	SHIFT LINK KIT
25	8539683	SLIDE
26	11-401386	NUT, (M6) Stainless Steel
27	23-42994	BUSHING
28	8M0187153	SHIFT SHAFT, Upper Comment: (X-Long)
29	10-40011113	SCREW, (M5 x 45) Stainless Steel
30	8582261	COVER
31	8M0008111	LINK
32	883081	LEVER
33	8M6005165	INDICATOR, Throttle Position
34	10-82130025	SCREW, (M6 x 25)
35	12-65567	WASHER, (.265 x .750 x .048) Stainless Steel
36	25-8M0190980	GROMMET
37	23-856954	BUSHING
38	8544862	BRACKET
39	54-858932	CLIP
40	858353T10	CAM ASSEMBLY
41	8235694	BALL, Threaded
42	23-8M0215006	BUSHING
43	10-40011155	SCREW, (M8 x 55) Stainless Steel
44	23-8807371	BUSHING
45	12-56720	WASHER, (.330 x .750 x .060) Stainless Steel
46	54-475451	CLIP

▶Top Cowl (22 parts)

Ref	OEM Part #	Part Name
-	37-8M0061187	DECAL, Horsepower 250
1	100-881288T66	TOP COWL ASSEMBLY, (Black) (Includes all Decals except HorsePower) Comment: SN# 1B447000 & Up
2	10-82130030	SCREW, (M6 x 30)
3	884041A04	SOUND BLANKET KIT
4	NSS	NOT SOLD SEPARATE, Sound Blanket-Top
5	NSS	NOT SOLD SEPARATE, Sound Blanket-Port
6	13-93702	WASHER, (.250 External Star)
7	826639T	COVER
8	8M0010389	BRACKET ASSEMBLY, Cowl Comment: SN# 1B447000 & Up
9	NSS	NOT SOLD SEPARATE, Pin
10	53-8237951	RING, Retaining
11	8M0207770	ROLLER
12	25-850685T02	GROMMET
13	8M0036792	BRACKET, Front
14	10-82130020	SCREW, (M6 x 20)
15	815477	BUMPER, Latch
16	8155381	PIN, Roll
17	11-401366	NUT, (M6) Stainless Steel
18	12-8M0204649	WASHER, (.281 x .500 x .060) Stainless Steel
19	53-8237951	RING, Retaining
20	8M0207770	ROLLER
21	12-87161	WASHER

▶Transom Brackets (21 parts)

Ref	OEM Part #	Part Name
1	3426-828334T03	BRACKET ASSEMBLY, Transom-Starboard
2	3425-828333T08	BRACKET ASSEMBLY, Transom-Port
3	22-8M0169588	FITTING, Grease Comment: (Port)
4	826125A1	TILT TUBE
5	11-826135	NUT, (1.00-14) Nylon Insert
6	25-45711	O-RING, (.612 x .103)
7	13-88750	WASHER
8	11-826164	NUT, (.875-14)
9	10-8M0149747	SCREW, (.500-20 x 4.500)
10	12-8M0204665	WASHER, (.530 x .870 x .105) Stainless Steel
11	12-8M0204648	WASHER, (1.5 x 3.05 x 0.13) Stainless Steel
12	11-82671117	NUT, (.500-20)
13	8M0115104	LEVER ASSEMBLY, Tilt Lock
14	24-830899	SPRING, Tension
15	23-65830	NYLINER
16	24-830900	SPRING, Compression
17	99633	KNOB
18	17-99615	PIN, Groove
19	17-893709	PIN
20	10-96930A1	BOLT ASSEMBLY
21	11-23161	NUT, (.375-24)

▶Vapor Separator Components (42 parts)

Ref	OEM Part #	Part Name
-	25-889316A1	O-RING KIT, Vapor Seperator
1	889317T1	COVER KIT
2	NSS	NOT SOLD SEPARATE, Seat
3	889318001	PLATE, Baffle
4	10-883223	SCREW, (M6 x 16)
5	27-889319	GASKET
6	22-883556	FITTING
7	25-8M0062785	O-RING
8	22-14868	FITTING
9	19-883208	PLUG
10	35-8M0122423	FILTER, Fuel
11	889320A1	FLOAT KIT
12	F10064	SHAFT
13	888725T02	PUMP ASSEMBLY, Fuel - High Pressure
14	8M6000589	SLEEVE
15	25-8893162	O-RING
16	26-889321	SEAL
17	889328	RETAINER
18	1395-9643	SCREW
19	888733T02	PUMP ASSEMBLY, Boost
20	25-889322	GROMMET
21	25-889316	O-RING
22	26-8M6001413	SEAL
23	889324T03	BOWL KIT
24	84-889325A02	WIRE
25	NSS	NOT SOLD SEPARATE, Check Valve
26	22-855424011	FITTING
27	889326A1	VALVE KIT, Inlet
28	10-889327002	SCREW, Drain
29	32-883545002	HOSE
30	8M0214989	SENSOR, Water
31	22-782792	FITTING, Elbow 45 Degree (1.25)
32	25-627021	O-RING, (.301 x .070)
33	889430	INSERT
34	884820	SHRADER VALVE
35	25-891778	O-RING
36	54-884819	CLIP
37	10-40011126	SCREW, (M6 x 13) Stainless Steel
38	25-855362001	GROMMET
39	23-883050	SPACER
40	10-81893460	SCREW, (M8 x 60)
41	12-4002318	WASHER

▶Water Hoses (12 parts)

Ref	OEM Part #	Part Name
-	61-841017A52	POWERHEAD ASSEMBLY
1	22-858855	FITTING, Straight
2	54-855228	CLAMP, (25.6 mm)
3	32-859090001	HOSE, Starboard Dump
4	32-859089001	HOSE, Port Dump
5	32-856839	TUBING
6	54-815504104	CLAMP, Worm Gear
7	32-774572	HOSE, (48.00 Inches Bulk) (Cut to 21 Inches)
8	54-815504104	CLAMP, Worm Gear
9	54-815504104	CLAMP, Worm Gear
10	22-291112	FITTING
11	22-996642	FITTING, Elbow 90 Degree (.125-27 x .250) Nylon

100-Hour / Annual Service Checklist

Regular maintenance keeps your Mercury 250 PRO XS (3.0L DFI) 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 250 PRO XS (3.0L DFI) (1B426561 THRU 1B752546) Parts & Diagrams

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