Mercury 250 LONG (3.0L)(EFI) (0T861319 & Up) Parts & Diagrams

OEM and aftermarket replacement parts for Mercury 250 LONG (3.0L)(EFI). Scroll down for exploded parts diagrams (28), specifications, and maintenance reference.

Mercury 250 LONG (3.0L)(EFI) (0T861319 & Up) Parts & Diagrams

🔎 Mercury 250 LONG (3.0L)(EFI) Reference Library — Exploded parts diagrams (28 diagrams), specifications, common issues, and maintenance checklist.

The Mercury 250 LONG (3.0L)(EFI) 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 LONG (3.0L)(EFI):

  • 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 LONG (3.0L)(EFI).

Accessories (1 parts) Accessories
Ref OEM Part # Part Name
0 858915A1 TRIM REDUCER KIT
Attenuator/Flywheel Cover (14 parts) Attenuator/Flywheel Cover
Ref OEM Part # Part Name
1 892854T01 COVER, Flywheel Comment: SN# 0T980000 & Up
2 25-13467 GROMMET, (.88 Inside Diameter)
3 25-8M0153609 GROMMET Comment: SN# 0T980000 & Up
4 19-89219001 PLUG Comment: SN# 0T980000 & Up
5 881909T3 ATTENUATOR ASSEMBLY
6 23-856954 BUSHING
7 25-8M0190980 GROMMET
8 882767 SEAL
9 25-20116 GROMMET
10 54-23567 CLIP
11 12-65567 WASHER, (.265 x .750 x .048) Stainless Steel
12 10-82130025 SCREW, (M6 x 25)
13 37-881865 DECAL, Caution-Start in Gear Comment: (Start In Gear)
14 10-69570 SCREW, (#10-16 x .750)
Bottom Cowl (24 parts) Bottom Cowl
Ref OEM Part # Part Name
1 113-850302A1 BOTTOM COWL, Port Comment: (PORT)
2 854367001 PLUG
3 113-850301A1 BOTTOM COWL, Starboard Comment: (STBD.)
4 8M0109218 SEAL, (44.00 Inches)
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 8M8027677 RIGGING KIT (UPPER)
18 NSS NOT SOLD SEPARATE, Clamp-Lower
19 10-82130012 SCREW, (M6 x 12)
20 NSS NOT SOLD SEPARATE, Strap
21 859343 FOAM
22 54-850181 TIE STRAP, (11.750 Inches)
23 852361T1 HANDLE, Cowl
24 13-29402 WAVE WASHER
Coil Plate (20 parts) Coil Plate
Ref OEM Part # Part Name
1 850295T2 PLATE, Coil Mounting
2 300-8M0077471 COIL KIT
3 10-82129130 SCREW, (M6 x 30)
4 84-881908T CABLE SET
5 54-828991T CLIP
6 33-941 SPARK PLUG
7 84-882757T1 HARNESS ASSEMBLY, Coil
8 84-858414A1 CABLE ASSEMBLY, Braided
9 10-82129110 SCREW, (M6 x 10)
10 12-8M0204649 WASHER, (.281 x .500 x .060) Stainless Steel
11 25-833155 GROMMET
12 12-4002318 WASHER
13 23-8502341 BUSHING
14 10-81893435 SCREW, (M8 x 35)
15 71-8M0157742 SENSOR KIT, (0-50 PSI)
16 22-8M0207782 FITTING Comment: SN# 0T980000 & Up
17 54-883066 CLIP, (.865)
18 54-816311T TIE STRAP, (8.00 Inches)
19 32-85978571 TUBING, (52.00 Inches Bulk) (Cut to 18 Inches)
20 12-36001 WASHER
Crankshaft, Pistons and Connecting Rods (23 parts) Crankshaft, Pistons and Connecting Rods
Ref OEM Part # Part Name
- 883894A07 POWERHEAD ASSEMBLY
1 482-9784A11 CRANKSHAFT ASSEMBLY
2 NSS NOT SOLD SEPARATE, Wear Sleeve
3 30-67923T BEARING, Ball (LOWER)
4 53-67446 RING
5 39-843198T01 RING, Seal Comment: SN# 0T980000 & Up
6 28-91800 KEY, Woodruff
7 25-35126 O-RING, (.859 x .139)
8 31-88270A02 RACE ASSEMBLY
9 NSS NOT SOLD SEPARATE, Needle Roller
10 700-878573A2 PISTON ASSEMBLY Comment: (PORT)(.030 O/S)
11 40-841202 RING
12 39-875257A12 RING SET, Piston Comment: (.030 O/S)
13 NSS NOT SOLD SEPARATE, Piston Ring-Lower
14 600-8M0125869 CONNECTING ROD ASSEMBLY
15 10-94320 SCREW, (.375-24 x 1.250)
16 31-844338A01 BEARING/CAGE KIT
17 NSS NOT SOLD SEPARATE, Needle Roller Bearing
18 12-88263 THRUST WASHER
19 29-8M0204715 BEARING, Needle
20 31-816773A2 BEARING ASSEMBLY (UPPER)
21 26-859093 SEAL
22 25-823683 O-RING, (1.989 x .070)
Cylinder Block and End Cap (64 parts) Cylinder Block and End Cap
Ref OEM Part # Part Name
- 883894A07 POWERHEAD ASSEMBLY
1 885-899162A07 CYLINDER BLOCK
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 8248577 DEFLECTOR
7 21-8781051 CHECK VALVE
8 17-8M0036405 PIN
9 17-43044 PIN, Dowel - Without Hole (.375 x .625)
10 19-850309001 PLUG, Stop Comment: SN# 0T980000 & Up
11 10-81893435 SCREW, (M8 x 35)
12 10-82446180 SCREW, (M10 x 80)
13 17-63779 PIN, Dowel (.250 x .625)
14 13536A13 SENSOR ASSEMBLY, Temperature
15 17-8405101 PIN
16 8588641 RETAINER
17 12-8M0214963 WASHER, (.406 x .750 x .105) Stainless Steel
18 11-4013610 NUT, (M10) Stainless Steel
19 8M0082988 SENSOR
20 10-40011107 SCREW, (M5 x 16) Stainless Steel
21 1171-9787A4 END CAP ASSEMBLY
22 25-62700 O-RING, (3.237 x .103)
23 26-8308981 SEAL
24 10-82130020 SCREW, (M6 x 20)
25 857186T02 PLATE ASSEMBLY
26 23-855729 MOUNT
27 10-82130145 SCREW, (M10 x 45)
28 10-82494810 SCREW, (M6 x 10) Comment: (Socket Head)
29 25-19565002 GROMMET Comment: SN# 0T980000 & Up
30 12-855725 WASHER
31 137151 RETAINER
32 54-858951 J CLIP
33 10-82130012 SCREW, (M6 x 12)
34 818574 SEAL
35 812851A27 CYLINDER HEAD ASSEMBLY
36 884391 SEAL
37 8M0057307 THERMOSTAT, 54 Degree C/130 Degree F Comment: SN# 0T947112 & Up
38 27-8503181 GASKET
39 8M0039357 COVER, Thermostat
40 10-82130025 SCREW, (M6 x 25)
41 10-8M0045380 SCREW, (M8 x 50)
42 8M0148668 SENSOR ASSEMBLY
43 25-896699 O-RING, (.351 x .072)
44 10-81893414 SCREW, (M8 x 14)
45 22-782792 FITTING, Elbow 45 Degree (1.25)
46 8266241 CLAMP
47 10-82130012 SCREW, (M6 x 12)
48 8583561 LEVER, TPI
49 10-82130025 SCREW, (M6 x 25)
50 23-856954 BUSHING
51 25-8M0190980 GROMMET
52 12-65567 WASHER, (.265 x .750 x .048) Stainless Steel
53 10-40011113 SCREW, (M5 x 45) Stainless Steel
54 8M6005165 INDICATOR, Throttle Position
55 8M0084743 LINK
56 54-858902 CLAMP
57 8582261 COVER
58 8544862 BRACKET
59 54-855228 CLAMP, (25.6 mm)
60 22-8533394 FITTING
61 32-8404461 HOSE (STARBOARD)
62 32-8404462 HOSE (PORT)
63 10-81893420 SCREW, (M8 x 20)
Driveshaft Housing and Exhaust Tube (28 parts) Driveshaft Housing and Exhaust Tube
Ref OEM Part # Part Name
1 3518-832937A06 HOUSING ASSEMBLY, Driveshaft
2 16-8M0008031 STUD, (M12 x 52)
3 10-857136 SCREW, (M12 x 35), External Hex
4 25-8331231 GROMMET
5 12-856982 WASHER, (.500 x .810 x .090) Stainless Steel
6 11-896895 NUT, (M12 x 1.75)
7 19-64649 PLUG
8 10-898834 SCREW, (M14 x 178)
9 88238A10 CABLE ASSEMBLY, Ground
10 12-815432 WASHER, (.562 x 2.00 x .125)
11 12-847541 WASHER
12 8M0055931 MOUNT
13 12-825190 WASHER
14 11-896602 NUT
15 8186442 CLAMP
16 10-84036240 SCREW, (M8 x 40)
17 13-72521 LOCKWASHER, Internal Tooth
18 8M0001136 COVER, Black
19 10-69079 SCREW, (#10-16 x .440)
20 8329321 SEAL
21 833116A4 TUBE ASSEMBLY, Exhaust
22 NSS NOT SOLD SEPARATE, Strainer
23 10-81893435 SCREW, (M8 x 35)
24 32-8M0042785 TUBE, Water
25 832940001 SEAL Comment: SN# 0T980000 & Up
26 8329391 CLAMP
27 10-41508 SCREW, (.250-20 x .500) Stainless Steel
28 10-81893435 SCREW, (M8 x 35)
Exhaust Plate (47 parts) Exhaust Plate
Ref OEM Part # Part Name
- 883894A07 POWERHEAD ASSEMBLY
1 840192T14 PLATE ASSEMBLY, Exhaust
2 27-8329335 GASKET
3 27-8329344 GASKET (LOWER)
4 8M0043157 SEAL
5 22-8320761 FITTING, Check Valve
6 22-8M0180565 PLUG, Pipe (.375-18) Brass
7 21-817519A1 CHECK VALVE ASSEMBLY, Drain
8 17-43044 PIN, Dowel - Without Hole (.375 x .625)
9 25-822002 GROMMET
10 19-48323 PLUG
11 65663A2 COVER ASSEMBLY
12 10-81893435 SCREW, (M8 x 35)
13 814190 CARRIER
14 25-814191 GROMMET
15 814189 POPPET
16 24-64878 SPRING
17 65664A1 PLATE ASSEMBLY
18 27-88907003 GASKET
19 648771 DIAPHRAGM
20 12-76451 WASHER
21 10-69570 SCREW, (#10-16 x .750)
22 10-81893435 SCREW, (M8 x 35)
23 850306A04 BOOT KIT, Idle Exhaust Comment: (Includes ref.'s 44 and 45)
24 54-850896 CLAMP, (28.6)
25 22-8M0077650 FITTING, Tell-Tale
26 19-821908 PLUG
27 12-821915 WASHER
28 22-8596001 FITTING
29 8219631 CHECK VALVE
30 25-30641 O-RING, (.299 x .103)
31 11-401386 NUT, (M6) Stainless Steel
32 883142A03 SHIFT LINK KIT Comment: SN# 0T980000 & Up
33 8539683 SLIDE
34 11-401386 NUT, (M6) Stainless Steel
35 23-42994 BUSHING
36 8M0036408 SHIFT SHAFT, Upper
37 23-48237 BUSHING
38 43585 COUPLING
39 32-859626A1 FLUSH HOSE KIT (INLET)
40 25-12602002 GROMMET Comment: SN# 0T980000 & Up
41 12-35459 WASHER
42 32-8M0108355 HOSE, (57.00 Inches Bulk) (Cut to 3 Inches)
43 22-858855 FITTING, Straight
44 888910 PLATE
45 10-82239312 SCREW, (M5 x 12)
46 22-328022 PLUG, Pipe (.125-27) Brass
Flywheel/Alternator (19 parts) Flywheel/Alternator
Ref OEM Part # Part Name
1 8M6013461 ALTERNATOR
2 24-8523742 SPRING
3 856815T2 ARM TENSIONER ASSEMBLY
4 12-4002320 WASHER
5 23-8568941 BUSHING
6 16-8M0034457 STUD, (M10 x 85)
7 11-826292 NUT, (M10) Brass/Nickel Plated
8 8M6005030 PULLEY ASSEMBLY
9 10-4010835 SCREW, (M10 x 35) Hex Flange - Stainless Steel
10 57-828507Q11 BELT
11 283-859619T1 FLYWHEEL
12 11-42979 NUT, (M16)
13 12-33001 WASHER, (.641 x 1.250 x .190)
14 19-45907 PLUG, Yellow
15 11-401386 NUT, (M6) Stainless Steel
16 84-856583A5 CABLE ASSEMBLY
17 12-4002319 WASHER
18 10-82130150 SCREW, (M10 x 50)
19 10-82130012 SCREW, (M6 x 12)
Fuel Management (57 parts) Fuel Management
Ref OEM Part # Part Name
- 883894A07 POWERHEAD ASSEMBLY
1 883951T1 ADAPTOR PLATE
2 27-804680 GASKET
3 828623T4 REED BLOCK
4 10-8555252 SCREW, (M6)
5 23-855364 BUSHING
6 25-855362001 GROMMET Comment: SN# 0T980000 & Up
7 10-81893435 SCREW, (M8 x 35)
8 12-817274 WASHER, (.344 x 1.00 x .063) Stainless Steel
9 10-81893430 SCREW, (M8 x 30)
10 883950T1 PLENUM KIT, Air
11 27-804679004 GASKET Comment: SN# 0T980000 & Up
12 10-1993716 SCREW, (M6 x 16)
13 884522 BRACKET, MAP Sensor
14 854445 SENSOR, MAP
15 8M0148668 SENSOR ASSEMBLY
16 25-896699 O-RING, (.351 x .072)
17 883949T1 THROTTLE BODY KIT
18 10-82130040 SCREW, (M6 x 40)
19 25-855426 O-RING
20 858851A03 LEVER ASSEMBLY, Throttle
21 8M0072162 ROLLER
22 12-8M0204666 WASHER, (.203 x .500 x .032)
23 8-32,11-826709104 NUT, Stainless Steel
24 10-889354 SCREW, Special
25 12-881991 WASHER, Cupped
26 12-881992 WASHER, Spool
27 10,13-69432 LOCKWASHER, External
28 858353A08 CAM ASSEMBLY
29 8235694 BALL, Threaded
30 23-8M0215006 BUSHING
31 23-8807371 BUSHING
32 10-40011155 SCREW, (M8 x 55) Stainless Steel
33 12-56720 WASHER, (.330 x .750 x .060) Stainless Steel
34 22-993211 FITTING
35 8M0185615 PUMP ASSEMBLY
36 883926 BRACKET
37 10-883942 SCREW, (M4 x 16)
38 10-82130025 SCREW, (M6 x 25)
39 12-8M0214930 WASHER
40 25-8M0190980 GROMMET
41 23-822003 BUSHING
42 883952T1 FUEL RAIL
43 8833821 RETAINER
44 10-840118 SCREW, (#8-32 x .380)
45 840481T01 INJECTOR ASSEMBLY
46 25-895239A01 O-RING KIT
47 8832151 TUBE
48 25-883355 O-RING
49 22-883940 FITTING
50 10-883376 SCREW, (#10-24 x .375)
51 883382 RETAINER
52 25-20385 O-RING, (.239 x .070)
53 84-880745T1 HARNESS ASSEMBLY, Fuel Rail
54 54-883941 CLAMP
55 54-8M0024808 J CLIP
56 10-82130040 SCREW, (M6 x 40)
Fuel Pump (33 parts) Fuel Pump
Ref OEM Part # Part Name
- 883894A07 POWERHEAD ASSEMBLY
1 NSS NOT SOLD SEPARATE, Fuel Pump
2 NSS NOT SOLD SEPARATE, Disc Check Valve
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 27-8M0204705 GASKET
13 987752 PLATE
14 22-16604 FITTING, Straight (.125-27)
15 10-82104540 SCREW, (M5 x 40), Fuel Pump
16 10-82130050 SCREW, (M6 x 50), Pump to Crankcase
17 144303 BASE
18 22-856842 ELBOW, To Crankcase
19 54-816311T TIE STRAP, (8.00 Inches)
20 32-8M0064783 HOSE, Pulse Line
21 22-822769 CONNECTOR
22 32-8M0064778 HOSE
23 NSS NOT SOLD SEPARATE, Cap
24 32-8M0064780 HOSE/SLEEVE
25 32-8M0108355 HOSE, (57.00 Inches Bulk) (Cut to 16 Inches)
26 22-858955 CONNECTOR
27 54-8M0214964 CLAMP, Hose (15.3)
28 32-8839461 HOSE
29 32-85583464 TUBING, (34.00 Inches Bulk) (Cut to 15 Inches) To Elbow on Plenum
30 32-85583464 TUBING, (34.00 Inches Bulk) (Cut to 28 Inches) To Oil Pump
31 54-816311T TIE STRAP, (8.00 Inches)
32 32-883965 CONDUIT
Gear Housing(Driveshaft)(Torque Master) (49 parts) Gear Housing(Driveshaft)(Torque Master)
Ref OEM Part # Part Name
- 26-816575A4 SEAL KIT, Gear Housing
1 1689-842739T16 GEAR HOUSING ASSEMBLY, Basic
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, (.375-16 x .250) Drain
10 12-191833 SEAL
11 859402 PITOT TUBE
12 26-8M0204708 SEAL, Oil
13 22-881866 FITTING
14 858934 COVER
15 27-858935 GASKET
16 25-8M0214927 O-RING, (.799)
17 10-82130016 SCREW, (M6 x 16)
18 10-82130016 SCREW, (M6 x 16)
19 NSS NOT SOLD SEPARATE, Pinion Gear (1.75:1 - 12/21)(Part of 43-828168T3)
20 12-92721 WASHER
21 11-35921 NUT, (.625-18)
22 12-77674 WASHER
23 824145 SHIFT SHAFT (LOWER)
24 28-8M0204723 KEY
25 45-848831 DRIVESHAFT
26 15-8M0063268 SHIM ASSEMBLY
27 31-8M0146553 BEARING, Tapered Roller
28 NSS NOT SOLD SEPARATE, Cup
29 15-42637A1 SHIM SET (006 THRU 048)
30 31-8M0146566 BEARING, Roller
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 10-82130016 SCREW, (M6 x 16)
38 817275A1 PUMP ASSEMBLY, Water
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)
47 45-848832A1 DRIVESHAFT ASSEMBLY
48 823902 COUPLING
Gear Housing, Propeller Shaft - Torque Master (34 parts) Gear Housing, Propeller Shaft - Torque Master
Ref OEM Part # Part Name
- 26-816575A6 SEAL KIT, Gear Housing
1 1689-842739T16 GEAR HOUSING ASSEMBLY, Basic
2 8M0226861 SHIFT CRANK
3 8M0235940 SPOOL ASSEMBLY
4 NSS NOT SOLD SEPARATE, Shift Spool
5 NSS NOT SOLD SEPARATE, Sleeve
6 NSS NOT SOLD SEPARATE, Cotter Pin
7 15-47397A1 SHIM SET
8 43-859321T04 GEAR SET, Forward/Pinion
9 31-828437A2 BEARING ASSEMBLY
10 NSS NOT SOLD SEPARATE, Cup
11 31-30895T BEARING, Needle
12 53-856823 RING, Retaining
13 52-848878T CLUTCH
14 17-78909 PIN, Detent
15 17-848838 PIN, Cross
16 24-78962 SPRING
17 44-848829 PROPELLER SHAFT
18 43-8M0192235 GEAR, Reverse
19 23-8241081 THRUST SPACER
20 30-88957T BEARING, Ball
21 681001 RING, Thrust
22 25-8M0214920 O-RING
23 848840A1 CARRIER ASSEMBLY, Bearing
24 31-817072 BEARING, Roller
25 53-817071 RING, Snap
26 26-815565 SEAL, Oil
27 30281A1 KEY
28 22-8M0058389 PLUG KIT, Drain (Magnetic) Comment: SN# 0T980000 & Up
29 12-191833 SEAL
30 14-79447 TAB WASHER
31 8M2011027 RETAINER
32 10-8M0204686 SCREW, (.437-14 x 1.750)
33 97-76214Q5 ANODE KIT
Oil Injection Components (20 parts) Oil Injection Components
Ref OEM Part # Part Name
1 1200-8M0119508 TANK ASSEMBLY
2 NSS NOT SOLD SEPARATE, Decal-Reservoir
3 10-58376 SCREW, (.164-18 x .375)
4 12-72761 WASHER, (.203 x .562 x .060) Stainless Steel
5 36-814449A3 CAP ASSEMBLY
6 27-42999T GASKET
7 87-856156T02 SWITCH ASSEMBLY
8 10-81893435 SCREW, (M8 x 35)
9 12-4002318 WASHER
10 25-855362001 GROMMET Comment: SN# 0T980000 & Up
11 23-855364 BUSHING
12 32-8M0108355 HOSE, (57.00 Inches Bulk) (Cut to 7 Inches)
13 54-816311T TIE STRAP, (8.00 Inches)
14 22-8M0207780 FITTING
15 32-875283 HOSE, (2.00 Inches)
16 35-875284T01 FILTER, Oil - In Line
17 32-875289 HOSE
18 22-858955 CONNECTOR
19 NSS NOT SOLD SEPARATE, Plug
20 32-892830053 HOSE, (24.00 Inches Braided) (Cut to 22 Inches)
Port Bleed System (13 parts) Port Bleed System
Ref OEM Part # Part Name
- 883894A07 POWERHEAD ASSEMBLY
1 21-8282182 CHECK VALVE
2 22-8272011 PIPE PLUG
3 32-8M0054152 TUBING, (38.00 Inches Bulk) (Cut to 20-1/2 Inches)
4 21-8159234 CHECK VALVE
5 21-8592352 CHECK VALVE, 90 Degree (.0625-27)
6 32-8M0054152 TUBING, (38.00 Inches Bulk) (Cut to 13 Inches)
7 21-426585 CHECK VALVE
8 22-8272011 PIPE PLUG
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 32-892024122 TUBING, (240.00 Inches Bulk) (Cut to 22-1/2 Inches)
Power Trim Components (38 parts) Power Trim Components
Ref OEM Part # Part Name
- 855998A11 POWER TRIM, Complete
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 Comment: (Incls. Ref. #26)
9 8M0142997 SHAFT KIT
10 17-878267 PIN
11 878235A03 TILT CYLINDER ASSEMBLY
12 878239A02 GUIDE KIT Comment: (Incls. Ref. #26)
13 8M0142999 O-RING KIT Comment: (Incls. Ref. #26)
14 8M0168219 SHOCK ROD KIT Comment: (Incls. Ref. #26)
15 8M0143000 PISTON ASSEMBLY, Memory
16 878406A02 REPAIR KIT, Check Valve Comment: (Incls. Ref. #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 Comment: SN# 0T980000 & Up
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 (2 parts) Powerhead Gasket Set Components
Ref OEM Part # Part Name
- 27-832934A00 GASKET SET, Powerhead
0 26-854639001 SEAL, Thermostat Comment: (Not used for this application)
Service/Support Material (1 parts) Service/Support Material
Ref OEM Part # Part Name
0 37-804670A05 DECAL, EPA Label Information Comment: 2005
Solenoid Plate (49 parts) Solenoid Plate
Ref OEM Part # Part Name
- 13540 CAP, Female
1 858366T2 PLATE
2 89-817109A2 SOLENOID ASSEMBLY, (#10-32 / .3125-18 Terminals)
3 25-822179 GROMMET
4 10-82129125 SCREW, (M6 x 25)
5 23-8M0214955 BUSHING
6 8M0207773 RELAY ASSEMBLY
7 NSS NOT SOLD SEPARATE, Decal
8 828102 BRACKET
9 23-8M0214955 BUSHING
10 25-818967 GROMMET
11 84-880005T2 HARNESS ASSEMBLY, Engine Wiring
12 88-832969T05 FUSE, Mini - Tan - 5 Ampere Comment: (5 AMP)
13 858754 COVER, Fuse
14 10-82129114 SCREW, (M6 x 14)
15 54-8M0024808 J CLIP
16 84-882830A1 CABLE ASSEMBLY
17 10-82130012 SCREW, (M6 x 12)
18 84-819514T18 HARNESS ASSEMBLY, Trim
19 84-859244T1 HARNESS ASSEMBLY, Digital Adaptor
20 84-878231A6 HARNESS ASSEMBLY, Fuse - 100 Ampere
21 12-8M0204649 WASHER, (.281 x .500 x .060) Stainless Steel
22 10-32,11-813938 CAP NUT,
23 11-8M0204668 NUT, (.312-18)
24 10-32,11-45076 NUT, Brass
25 13-53166 LOCKWASHER, (.312)
26 54-858755 CLIP, (1.00)
27 54-828991T CLIP
28 89790646T PCM, Propulsion Control Module Comment: SN# 0T920526 & Up
29 10-82130025 SCREW, (M6 x 25)
30 23-856954 BUSHING
31 25-8M0190980 GROMMET
32 12-65567 WASHER, (.265 x .750 x .048) Stainless Steel
33 8590881 CLIP
34 10-82129110 SCREW, (M6 x 10)
35 881879A2 SENSOR KIT, (100 PSI), PRESSURE
36 22-8M0207782 FITTING
37 54-883066 CLIP, (.865)
38 859313 BRACKET
39 25-818967 GROMMET
40 23-8M0214955 BUSHING
41 10-82130025 SCREW, (M6 x 25)
42 54-816311T TIE STRAP, (8.00 Inches)
43 84-88807A16 CABLE ASSEMBLY, (4.00 Inches) Black
44 10-81893420 SCREW, (M8 x 20)
45 84-88439A25 CABLE ASSEMBLY, Battery - Positive
46 832948A1 CONNECTOR ASSEMBLY
47 881065A1 CONNECTOR, 6 Pin Plug
48 85-8500671 BOOT, Insulator - Red
Speedomter/Block Pressure System (8 parts) Speedomter/Block Pressure System
Ref OEM Part # Part Name
1 22-881866 FITTING
2 32-85978571 TUBING, (52.00 Inches Bulk) (Cut to 44 Inches)
3 22-8M0214971 COUPLER
4 22-859732 PLUG
5 22-8M0214970 FITTING, Adapter
6 32-85978571 TUBING, (52.00 Inches Bulk) (Cut to 5 Inches)
7 22-875207 TEE, Fitting, To Coil Plate Sensor
8 32-85944975 TUBING, (72.00 Inches Bulk) (Cut to 52 Inches)
Starboard Bleed System (8 parts) Starboard Bleed System
Ref OEM Part # Part Name
- 883894A07 POWERHEAD ASSEMBLY
1 32-8M0054152 TUBING, (38.00 Inches Bulk) (Cut to 15-1/2 Inches)
2 21-8592352 CHECK VALVE, 90 Degree (.0625-27)
3 32-8M0054152 TUBING, (38.00 Inches Bulk) (Cut to 16-1/2 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 21-8282182 CHECK VALVE
Starter Motor (13 parts) Starter Motor
Ref OEM Part # Part Name
1 50-892339T01 STARTER MOTOR ASSEMBLY Comment: SN# 0T960099 & Up
2 10-803005 THRU BOLT
3 43-880805A1 GEAR KIT
4 809463A1 SOLENOID KIT
5 10-69035 SCREW AND LOCKWASHER, (.250-20 x .625) Stainless Steel
6 84-93388A1 CABLE ASSEMBLY, (6.00 Inches) Black
7 37-8272822 DECAL, Warning, High Voltage
8 13-400255 LOCKWASHER, (M5)
9 11-400211 NUT, (M5) Stainless Steel
10 13-8M0204647 LOCKWASHER, (.312)
11 11-400213 NUT, (M8) Stainless Steel
12 23-8M0034918 COLLAR
13 8M0043276 STOP
Swivel Bracket and Steering Arm (28 parts) Swivel Bracket and Steering Arm
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 814084F1 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 17-67706A55 SWIVEL PIN ASSEMBLY, Steering Arm
21 10-8M0000518 SCREW, (M12 x 175)
22 23-840193 SPACER
23 12-4002321 WASHER, (12.80 mm x 24.0 mm x 2.4 mm) Stainless Steel
24 11-896963 NUT, (M12)
25 92876A12 LINK ROD ASSEMBLY
26 10-849838 SCREW, (.375-24 x 1.250)
27 11-8M0204726 NUT, (.375-24) Stainless Steel
28 12-37828 WASHER, (.390 x .625 x .062) Stainless Steel
Throttle Linkage (25 parts) Throttle Linkage
Ref OEM Part # Part Name
1 8M0040987 LEVER
2 10-81893435 SCREW, (M8 x 35)
3 12-36042 WASHER
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 8583541 LINK, To Cam
12 824010T05 BRACKET
13 824016 LATCH
14 10-42975 DRIVE SCREW
15 824015 CUP, Barrel Retainer
16 10-82155025 SCREW, (M8 x 25) Stainless Steel
17 54-859172 CLAMP
18 10-82155025 SCREW, (M8 x 25) Stainless Steel
19 8M0039052 GUIDE, Roller
20 87-8M0207794 SWITCH
21 54-816311T TIE STRAP, (8.00 Inches)
22 10-82470620 SCREW, (M3.5 x 20)
23 12-43430 WASHER
24 12-35459 WASHER
25 12-36001 WASHER
Tools (1 parts) Tools
Ref OEM Part # Part Name
0 91-881814A1 SEAL KIT, Wire Harness Comment: (ELECTRICAL)
Top Cowl (23 parts) Top Cowl
Ref OEM Part # Part Name
- 37-891877A04 DECAL SET (RED)
1 4001-880012T1 TOP COWL ASSEMBLY
2 10-82130030 SCREW, (M6 x 30)
3 880014A02 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 850682T4 HOOK ASSEMBLY, Rear Latch
9 NSS NOT SOLD SEPARATE, Pin
10 53-8237951 RING, Retaining
11 8M0207770 ROLLER
12 25-850685T02 GROMMET Comment: SN# 0T962423 & Up
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
22 NSS NOT SOLD SEPARATE, Decal -Break-In
Transom Brackets (19 parts) Transom Brackets
Ref OEM Part # Part Name
1 3426-828334T03 BRACKET ASSEMBLY, Transom-Starboard
2 3425-828333T08 BRACKET ASSEMBLY, Transom-Port
3 22-8M0169588 FITTING, Grease (PORT)
4 826125A1 TILT TUBE
5 11-826135 NUT, (1.00-14) Brass/Nickel Plate
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
Vapor Separator Components (35 parts) Vapor Separator Components
Ref OEM Part # Part Name
1 883245T04 COVER KIT
2 22-881740 FITTING, Straight
3 22-883249 FITTING
4 NSS NOT SOLD SEPARATE, Elbow
5 22-885186A1 FITTING KIT Comment: (Use with Filter)
6 25-831985 O-RING, (.468 x .078) Comment: (Use with Filter)
7 35-885188 FILTER
8 883219 VALVE
9 25-8M0062785 O-RING
10 883220 CAP
11 19-883208 PLUG
12 26-883248 SEAL
13 27-883252 GASKET
14 883257T1 REGULATOR
15 25-883593A1 O-RING KIT
16 12-883258 WASHER
17 10-883261 SCREW, (M5 x .8)
18 10-883261 SCREW, (M5 x .8)
19 84-881831 WIRE ASSEMBLY
20 1395-808612 SCREW AND WASHER, (#8-32 x .750)
21 883253A1 FLOAT KIT
22 F10064 SHAFT
23 883247A1 VALVE/SEAT KIT, Inlet
24 10-883223 SCREW, (M6 x 16)
25 35-18458Q4 FILTER KIT
26 8M0204710 PROBE
27 889318002 BAFFLE
28 10-883223 SCREW, (M6 x 16)
29 881705T1 PUMP KIT
30 8M6000589 SLEEVE
31 883256T1 BOWL KIT
32 26-883248 SEAL
33 19-855435A1 PLUG KIT
34 25-8M0062785 O-RING
35 10-16955 SCREW, (M6 x 8)

100-Hour / Annual Service Checklist

Regular maintenance keeps your Mercury 250 LONG (3.0L)(EFI) running reliably season after season. Most of these tasks can be performed with basic tools and the factory service manual.

  1. Replace water pump impeller and inspect wear plate
  2. Change engine oil and oil filter (check drain plug washer)
  3. Replace spark plugs and check ignition timing
  4. Drain and refill lower unit gear oil; inspect for water contamination
  5. Inspect fuel lines, primer bulb, and fuel filter for deterioration
  6. Check and replace sacrificial anodes (zinc or aluminum)
  7. Inspect propeller for damage; check shaft seal and cotter pin
  8. Check valve clearance (refer to service manual for specifications)
  9. Lubricate all grease points (steering, tilt tube, shift linkage)
  10. 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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