Mercury 25 (4-STROKE) (0P153500 THRU 0P388282) Parts & Diagrams

OEM and aftermarket replacement parts for Mercury 25 (4-STROKE). Scroll down for exploded parts diagrams (31), specifications, and maintenance reference.

Mercury 25 (4-STROKE) (0P153500 THRU 0P388282) Parts & Diagrams

🔎 Mercury 25 (4-STROKE) Reference Library — Exploded parts diagrams (31 diagrams), specifications, common issues, and maintenance checklist.

The Mercury 25 (4-STROKE) is a 4-Stroke, Inline 3-Cylinder, EFI outboard motor. Commonly used on jon boats, pontoons, and mid-size utility craft.

Quick Reference Specifications

Specification Value
Engine Type 4-Stroke, Inline 3-Cylinder, EFI
Horsepower 25 HP
Displacement 526 cc
Bore x Stroke 61 mm x 57 mm
Spark Plug (Type & Gap) NGK BKR6E
Engine Oil Capacity 1.8 L (1.9 quart)
Recommended Engine Oil SAE 25W-40 Synthetic Blend Mercury FC-W
Gear Case Oil Capacity 280-350 mL (9.5-12 fl oz)
Idle Speed (in gear) 700 ± 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 25 (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 25 (4-STROKE).

Accessories (1 parts) Accessories
Ref OEM Part # Part Name
- 45-859483A1 DRIVESHAFT ASSEMBLY
Adaptor Plate (29 parts) Adaptor Plate
Ref OEM Part # Part Name
1 825228A17 ADAPTOR PLATE ASSEMBLY
2 19-822464 PLUG
3 19-48323 PLUG
4 17-23784 PIN, Dowel
5 825989003 DIPSTICK TUBE Comment: SN# USA-0T980000/BEL-0P325500 & Up
6 26-828932 SEAL, Oil
7 23-856743 BUSHING
8 8M0162935 DIPSTICK
9 8560552 SEAL
10 22-629101 FITTING, Elbow - 90 Degree (.125-27)
11 54-816311T TIE STRAP, (8.00 Inches)
12 22-889567 PLUG, (.500-14)
13 25-822408001 GROMMET Comment: SN# USA-0T980000/BEL-0P325500 & Up
14 27-8M0213113 GASKET Comment: SN# USA-0T980000/BEL-0P325500 & Up
15 25-845746 O-RING
16 10-8M0204741 SCREW, (M6 x 20) Stainless Steel
17 8M0210772 BODY, Oil Pressure Relief Comment: (DESIGN II)
18 893765 PLATE, Oil Pickup-Top
19 32-854793 HOSE, Oil Pickup
20 893700 BAFFLE
21 54-855228 CLAMP
22 10-4007455 SCREW, (M6 x 55)
23 25-19565002 GROMMET Comment: (SPLIT-POWER TRIM) SN# USA-0T980000/BEL-0P325500 & Up
24 8289151 HEAT SHIELD
25 856592 DEFLECTOR, Oil Comment: (DESIGN I)
26 8M0210772 BODY ASSEMBLY, Oil Pressure Relief Comment: (DESIGN I)
27 18-45882 COTTER PIN Comment: (DESIGN I)
28 8252151 PLUNGER Comment: (DESIGN I)
29 24-825216 SPRING Comment: (DESIGN I)
Bottom Cowl (20 parts) Bottom Cowl
Ref OEM Part # Part Name
1 4020-826277T1 BOTTOM COWL Comment: (Long-Port)
2 4020-826278T7 BOTTOM COWL Comment: (Long Starboard)
3 10-82684430 SCREW, (M6 x 30)
4 12-8M0204649 WASHER, (.281 x .500 x .060) Stainless Steel
5 825238002 SEAL Comment: SN# USA-0T980000/BEL-0P325500 & Up
6 12-855576 WASHER
7 27-855627 GASKET
8 10-82684460 SCREW, (M6 x 60)
9 22-827948 FITTING, Telltale
10 826273001 BOOT Comment: SN# USA-0T980000/BEL-0P325500 & Up
11 54-816311T TIE STRAP, (8.00 Inches)
12 825782F1 LEVER, Cowl Latch
13 23-812707 BUSHING
14 13-12134 WASHER, Wave
15 893766 LATCH HOOK
16 10-1993716 SCREW, (M6 x 16)
17 8M0032848 RETAINER Comment: (NON POWER TRIM)
18 812830T01 PLUG, Trim Switch Comment: (NON POWER TRIM)
19 87-8M0235191 SWITCH, Trim (Power Trim) Comment: SN# 0P401000 & Up
20 37-88343312 DECAL, California Ultra Low Emissions
Camshaft/Oil Pump (13 parts) Camshaft/Oil Pump
Ref OEM Part # Part Name
- 830271T4 CYLINDER HEAD Comment: (MANUAL)
1 10-82761140 SCREW, (M10 x 40)
2 12-4002319 WASHER
3 8M0151040 BELT
4 8331043 GEAR, Driven
5 17-825956 PIN, Dowel
6 406-853894A2 CAMSHAFT Comment: (MANUAL)
7 17-826149 PIN
8 852388T1 PUMP ASSEMBLY, Oil
9 25-826152 O-RING
10 25-826154 O-RING
11 25-826153 O-RING
12 10-8M0205943 SCREW, (M6 x 35)
Carburetor (38 parts) Carburetor
Ref OEM Part # Part Name
- 854256 REPAIR KIT, Carburetor Comment: (Bodensee)
1 3329-830276A18 CARBURETOR Comment: (BODENSEE)
2 10-854246 SCREW
3 854245 PLATE
4 27-8542572 GASKET
5 854254T ENRICHENER Comment: (BODENSEE)
6 NSS NOT SOLD SEPARATE, O Ring
7 854255 PLATE
8 10-8542461 SCREW Comment: (BODENSEE)
9 24-854249 SPRING
10 50,855406 JET, Pilot (SJ)
11 19-854248 PLUG, Rubber Comment: (BODENSEE)
12 105,8554063,105,105 JET, Main (MJ) Comment: (BODENSEE)
13 854247 VALVE, Float
14 854253 FLOAT Comment: (BODENSEE)
15 17-8542581 PIN, Float
16 27-8542573 GASKET
17 854252 FLOAT BOWL Comment: (BODENSEE)
18 10-8542463 SCREW
19 10-8542462 SCREW, Drain Comment: (BODENSEE)
20 12-8542591 WASHER
21 24-880847 SPRING
22 854251 PLUNGER Comment: (BODENSEE)
23 NSS NOT SOLD SEPARATE, Cap-Rubber
24 23-854244 COLLAR
25 8542502 MAIN NOZZLE
26 8554064 JET (PO) Comment: (BODENSEE)
27 NSS NOT SOLD SEPARATE, O Ring Comment: BODENSEE
28 10-880845 SCREW
29 10-880848 SCREW
30 10-880841 SCREW, Adjusting
31 25-880842 O-RING
32 24-880815 SPRING
33 32-875248003 HOSE, Carburetor Vent Comment: SN# 0P256334 & Up
34 8M0214940 TIE STRAP, (5.50 Inches)
35 32-85682239 TUBING, (17.00 Inches Bulk) Comment: SN# 0P256333 & Below
36 54-816311T TIE STRAP, (8.00 Inches) Comment: SN# 0P256333 & Below
37 22-822769 CONNECTOR Comment: SN# 0P256333 & Below
Clamp Bracket (38 parts) Clamp Bracket
Ref OEM Part # Part Name
1 3411-821773T1 CLAMP BRACKET (Port)
2 3412-821774T8 CLAMP BRACKET (Starboard)
3 10-818883A1 THUMB SCREW ASSEMBLY Comment: (MANUAL)
4 NSS NOT SOLD SEPARATE, Handle Comment: MANUAL
5 NSS NOT SOLD SEPARATE, Rivet Comment: MANUAL
6 12-818884 WASHER Comment: (MANUAL)
7 10-768042 SHOULDER SCREW, Hex Comment: (MANUAL)
8 8224011 CAP
9 17-25810 PIN
10 23-86637 BEARING
11 17-8224002 PIN
12 97-8252711 ANODE
13 12-8M0204649 WASHER, (.281 x .500 x .060) Stainless Steel
14 10-8M0204707 SCREW, (M6 x 25)
15 11-82671117 NUT, (.500-20)
16 12-8M0204648 WASHER, (1.5 x 3.05 x 0.13) Stainless Steel
17 10-814259 SCREW, (.500-20 x 4.00)
18 37-830253 DECAL, Tilt Lock
19 828533T1 TRIM, HYDRAULIC ASSIST Comment: (GAS ASSIST TRIM)
20 88238A11 CABLE ASSEMBLY Comment: (GAS ASSIST TRIM)
21 828924 LEVER, Tilt Comment: (GAS ASSIST TRIM)
22 8M0007469 TILT KNOB Comment: (GAS ASSIST TRIM)
23 828930 ARM, Lever Comment: (GAS ASSIST TRIM)
24 13-31030 WAVE WASHER Comment: (GAS ASSIST TRIM)
25 17-25319 PIN, (.125 x 0.75 Inches) Comment: (GAS ASSIST TRIM)
26 8289961 LINK Comment: (GAS ASSIST TRIM)
27 10-32,11-8M0204718 NUT, Stainless Steel Comment: GAS ASSIST TRIM
28 17-822481001 PIN, (14 mm) Comment: (GAS ASSIST & POWER TRIM) SN# USA-0T980000/BEL-0P325500 & Up
29 23-822482 BUSHING Comment: (GAS ASSIST & POWER TRIM)
30 23-822484 BUSHING Comment: (GAS ASSIST & POWER TRIM)
31 12-825190 WASHER Comment: (GAS ASSIST & POWER TRIM)
32 11-826712 NUT Comment: (GAS ASSIST & POWER TRIM)
33 10-4009040 SCREW, (M10 x 40) Stainless Steel Comment: (GAS ASSIST & POWER TRIM)
34 12-4002319 WASHER Comment: (GAS ASSIST & POWER TRIM)
35 11-40140 NUT, (M10) Comment: (GAS ASSIST & POWER TRIM)
36 17-853923A1 PIN Comment: (HANDLE-NON POWER TRIM)
37 24-821461 SPRING Comment: (HANDLE-NON POWER TRIM)
38 NSS NOT SOLD SEPARATE, Decal-Warning
Clamp Bracket(Remote Control) (31 parts) Clamp Bracket(Remote Control)
Ref OEM Part # Part Name
1 3411-821773T1 CLAMP BRACKET Comment: (PORT)
2 3412-821774T8 CLAMP BRACKET Comment: (STARBOARD)
3 8224011 CAP
4 17-25810 PIN
5 23-86637 BEARING
6 17-8224002 PIN
7 NSS NOT SOLD SEPARATE, Decal-Shallow Water
8 37-830253 DECAL, Tilt Lock
9 11-40140 NUT, (M10)
10 12-4002319 WASHER
11 97-8252711 ANODE
12 12-8M0204649 WASHER, (.281 x .500 x .060) Stainless Steel
13 10-8M0204707 SCREW, (M6 x 25)
14 16-8M0034459 STUD, (M10 x 277)
15 23-824952 SPACER
16 11-82671117 NUT, (.500-20)
17 12-8M0204648 WASHER, (1.5 x 3.05 x 0.13) Stainless Steel
18 10-814259 SCREW, (.500-20 x 4.00)
19 11-40140 NUT, (M10)
20 12-4002319 WASHER
21 17-8M0026103 PIN ASSEMBLY, Tilt Lock
22 24-821461 SPRING
23 822409 LEVER
24 17-25319 PIN, (.125 x 0.75 Inches)
25 23-824858 BUSHING (PLASTIC)
26 878580 ROD, Plastic
27 23-824858 BUSHING (PLASTIC)
28 23-823812 BUSHING
29 822411 ARM
30 878563 LINK ROD Comment: SN# Belgium-0P268000 & Up
31 24-832085A1 SPRING
Crankshaft (18 parts) Crankshaft
Ref OEM Part # Part Name
- 27-830270A02 GASKET SET
1 2400-8M0084517 CRANKSHAFT
2 28-893761 KEY
3 28-91800 KEY, Woodruff
4 8M0151047 SEAL
5 8M0151048 SEAL
6 600-893530T01 CONNECTING ROD Comment: SN# USA-0T801000/BEL-0P268000 & Up
7 10-8M0049884 BOLT
8 23-893630002 BEARING, Blue
9 700-893524T02 PISTON Comment: (.50 Oversize)(Piston Only)
10 39-893525A03 RING, Piston (TOP) Comment: (.50MM Oversize)
11 NSS NOT SOLD SEPARATE, Piston Ring (2nd) Comment: (Oversize)
12 NSS NOT SOLD SEPARATE, Piston Oil Ring Comment: (Oversize)
13 41-893863 PIN, Piston
14 40-825017 RETAINER
15 652-831876A1 BALANCE ROD
16 701-831875T2 PISTON
17 11-893789 NUT
Cylinder Block (31 parts) Cylinder Block
Ref OEM Part # Part Name
- 27-830270A02 GASKET SET
1 2806-830267T3 CYLINDER BLOCK
2 17-825010 PIN, Dowel
3 22-479452 PLUG
4 22-384073 PLUG, Pipe (.500-14)
5 22-416223 PLUG, Pipe (.750-14)
6 23-893631002 BEARING, Blue
7 822625 NIPPLE, (M20)
8 10-82506182 SCREW, (M8 x 82)
9 10-8M0205943 SCREW, (M6 x 35)
10 27-8M0069692 GASKET
11 35-8M0162830 FILTER, Oil Comment: QUICKSILVER SN# USA-0T801000/BEL-0P268000 & Up
12 27-830298 GASKET
13 883336T1 COVER, Exhaust
14 855676003 THERMOSTAT Comment: SN# USA-0T980000/BEL-0P325500 & Up
15 27-8M0177107 GASKET
16 8M0188835 COVER Comment: SN# USA-0T801000/BEL-0P268000 & Up
17 10-8M0205943 SCREW, (M6 x 35)
18 22-996642 FITTING, Elbow 90 Degree (.125-27 x .250) Nylon
19 54-816311T TIE STRAP, (8.00 Inches)
20 893697 LIFTING EYE
21 10-857139 SCREW, (M8 x 35)
22 35-8548091 FILTER, Breather
23 27-8547801 GASKET
24 832734A2 BREATHER COVER
25 10-8M0204741 SCREW, (M6 x 20) Stainless Steel
26 32-77653A6 HOSE, To Fitting in Adaptor Plate
27 54-8M0024808 J CLIP
28 10-8M0204741 SCREW, (M6 x 20) Stainless Steel
29 25-854722 O-RING
30 8556692 COVER
Cylinder Head (22 parts) Cylinder Head
Ref OEM Part # Part Name
- 27-830270A02 GASKET SET
1 830271T2 CYLINDER HEAD
2 8M0054272 GUIDE Comment: SN# USA-0T980000/BEL-0P325500 & Up
3 53-825038 CIRCLIP
4 826887M ANODE
5 25-825040 GROMMET
6 826888M COVER
7 10-8M0204741 SCREW, (M6 x 20) Stainless Steel
8 10-827607 BOLT
9 27-827610 GASKET
10 26-825048 SEAL, Oil
11 25-833103 O-RING
12 830272A1 COVER
13 NSS NOT SOLD SEPARATE, Decal-Servicing Referral
14 NSS NOT SOLD SEPARATE, Decal-Engine Oil/Valve Clearance
15 27-8M0049885 GASKET
16 10-8M0204741 SCREW, (M6 x 20) Stainless Steel
17 10-893745025 SCREW, (M6 x 25)
18 10-82503395 SCREW, (M9 x 95)
19 17-825010 PIN, Dowel
20 859578A1 PLUG ASSEMBLY, Oil
21 NSS NOT SOLD SEPARATE, O Ring
Driveshaft Housing (16 parts) Driveshaft Housing
Ref OEM Part # Part Name
- 27-830270A02 GASKET SET
1 42941001 SEAL, Water Tube Comment: SN# USA-0T801000/BEL-0P268000 & Up
2 3532-825218T7 HOUSING ASSEMBLY, Driveshaft Comment: (Long)
3 825220T06 PIPE, Exhaust Comment: (Long)
4 10-824459110 SCREW, (M8 x 110) Stainless Steel
5 10-88960845 SCREW, (M8 x 45)
6 8288181 PLUG, Drain
7 27-8M0204692 GASKET
8 826276 BUMPER
9 8M0151042 GROMMET Comment: (Long) SN# USA-0T801000/BEL-0P268000 & Up
10 16-823984 STUD, (M10 x 50)
11 12-8M0214963 WASHER, (.406 x .750 x .105) Stainless Steel
12 11-40140 NUT, (M10)
13 32-897971A01 TUBE, Water Comment: (Long) SN# 1B145487 & Up
14 54-828529 GUIDE
15 8M0043364 BUMPER (Long)
Electrical Components (46 parts) Electrical Components
Ref OEM Part # Part Name
- 61-854236T00 POWERHEAD ASSEMBLY
1 89-8M0185146 SOLENOID ASSEMBLY (Electric)
2 23-8M0214955 BUSHING (Electric)
3 25-818967 GROMMET (Electric)
4 8-32,11-26419 NUT, Brass (Electric)
5 11-94330 NUT, (.250-20) Brass (Electric)
6 84-88439A9 CABLE ASSEMBLY, Battery - Positive (Electric)
7 85-880786 BOOT, Insulator - Red (Electric)
8 84-93388A16 CABLE ASSEMBLY, (8.50 Inches) (Electric)
9 84-88439A4 CABLE ASSEMBLY, Battery - Negative (Electric)
10 50-893886T STARTER MOTOR ASSEMBLY (Electric) Comment: SN# USA-1B227000 & Up
11 10-40011149 SCREW, (M8 x 25) Stainless Steel Comment: (Manual)
12 10-8248324 SCREW, (M6 x 16) Comment: (Manual)
13 13541 PLUG, Male (Non Power Trim)
14 54-8M0024808 J CLIP (Manual)
15 87-8M0098207 PRESSURE SWITCH
16 8M0082988 SENSOR
17 10-40011107 SCREW, (M5 x 16) Stainless Steel
18 856040 BRACKET (Electric)
19 856836001 RETAINER (Electric) Comment: SN# USA-0T980000/BEL-0P325500 & Up
20 92753 RETAINER (Electric)
21 10-82129125 SCREW, (M6 x 25 MM)
22 12-8M0214930 WASHER
23 856837 PLATE
24 23-826618 BUSHING
25 25-8M0190980 GROMMET
26 87843301S ECM, Engine Control Module
27 37-881865 DECAL, Caution-Start in Gear
28 23-8539201 BUSHING
29 10-82129140 SCREW, (M6 x 40)
30 33-827858Q SPARK PLUG, NGK-DPR6EA-9
31 54-816311T TIE STRAP, (8.00 Inches)
32 339-859738T1 COIL ASSEMBLY, Ignition
33 10-82684430 SCREW, (M6 x 30)
34 84-859201T1 HARNESS ASSEMBLY, Engine Wiring (Manual)
35 84-859202T2 HARNESS ASSEMBLY, Engine Wiring (Electric)
36 88-812619 FUSE, Yellow - 20 Ampere (Electric)
37 828054 COVER, Fuse (Electric)
38 10-82129110 SCREW, (M6 x 10) (Electric)
39 84-852375A6 HARNESS ASSEMBLY, Extension (Electric Handle)
40 883071T1 REGULATOR, Voltage (Electric)
41 8308971 FOAM PAD (Electric)
42 893771 BRACKET (Electric)
43 10-8248329 SCREW, (M6 x 40) (Electric)
44 8M0214984 SENSOR ASSEMBLY Comment: SN# USA-0T980000/BEL-0P325500 & Up
45 25-627021 O-RING, (.301 x .070)
Flywheel (14 parts) Flywheel
Ref OEM Part # Part Name
- 61-854236T00 POWERHEAD ASSEMBLY
1 859284T2 FLYWHEEL COVER Comment: (ELECTRIC)
2 10-8248326 SCREW, (M6 x 25 MM) Comment: (ELECTRIC)
3 284-832010T32 FLYWHEEL Comment: (ELECTRIC)
4 284-832010T27 FLYWHEEL Comment: (MANUAL)
5 NSS NOT SOLD SEPARATE, Decal-Warning-Spinning Flywheel
6 NSS NOT SOLD SEPARATE, Decal-Timing Marks
7 NSS NOT SOLD SEPARATE, Decal-Warning-Neutral
8 11-893789 NUT
9 12-893762 WASHER
10 10-4013930 SCREW, (M5 x 30)
11 398-852387T7 STATOR Comment: (ELECTRIC)
12 834838 LOAD RING
13 833102T GEAR, Drive
Fuel Pump (19 parts) Fuel Pump
Ref OEM Part # Part Name
- 25-16524 O-RING, Fuel Connector
1 8M0141844 PUMP, Fuel Comment: SN# USA-0T939655/BEL-0P301504 & Up
2 10-883517 SCREW
3 883520A1 DIAPHRAGM KIT
4 24-8835181 SPRING
5 11-883519 NUT
6 24-883518A03 SPRING Comment: SN# USA-0T939655/BEL-0P301504 & Up
7 NSS NOT SOLD SEPARATE, Cap Comment: SN# USA-0T939655/BEL-0P301504 & Up
8 8M0007776 DEFLECTOR, Cowl
9 10-82684430 SCREW, (M6 x 30)
10 32-8M0108349 TUBING, (.312) (70.00 Inches Bulk), Cut to 13 Inches - To Block Exhaust Cover
11 32-8M0108349 TUBING, (.312) (70.00 Inches Bulk), Cut to 6 Inches - To Telltale
12 32-828547T1 CONDUIT, (.500 Inside Diameter x 3.00 Feet Bulk) (13 IN.)
13 32-8M0108355 HOSE, (57.00 Inches Bulk), Cut to 19 Inches - to Float Bowl
14 35-877565T1 FILTER, Fuel
15 32-8M0108355 HOSE, (57.00 Inches Bulk), Cut to 7 Inches
16 54-816311T TIE STRAP, (8.00 Inches)
17 22-816856A5 CONNECTOR ASSEMBLY, Fuel
18 54-888441 CLAMP, Oetiker (12.8 mm)
Gear Housing(Driveshaft)(2.41:1 Gear Ratio) (39 parts) Gear Housing(Driveshaft)(2.41:1 Gear Ratio)
Ref OEM Part # Part Name
- 823547A03 SEAL KIT, Gear Housing
1 1682-821306T12 GEAR HOUSING ASSEMBLY, Basic
2 818226A1 SEAL/PLATE KIT
3 NSS NOT SOLD SEPARATE, Plate
4 10-79953Q04 SCREW KIT, (.375-16 x .250) Drain
5 12-191833 SEAL
6 22-8M0058389 FITTING KIT, Magnetic, Plug Fill/Drain Comment: (MAGNETIC)
7 12-191833 SEAL
8 11-828490 NUT
9 NSS NOT SOLD SEPARATE, Pinion Gear 12 Teeth (Part of 43-833000A2)
10 31-821321A2 BEARING ASSEMBLY
11 NSS NOT SOLD SEPARATE, Cup
12 10-8248324 SCREW, (M6 x 16)
13 46-821351A3 HOUSING ASSEMBLY, Water Pump Upper
14 8235471 SEAL Comment: (LONG - 2-1/4)
15 12-866451 WASHER
16 28-8M0214993 KEY
17 12-866451 WASHER
18 27-822189 GASKET, Upper Water Pump
19 27-8M0214956 GASKET, Lower Water Pump (LOWER)
20 8213542 FACE PLATE
21 47-8M0204712 IMPELLER
22 46-821307A2 BASE ASSEMBLY, Water Pump
23 26-821309 SEAL
24 26-821310 SEAL
25 25-821308 O-RING, (1.421 x .139)
26 45-832987A1 DRIVESHAFT Comment: (LONG)
27 30-821311 BEARING, Ball
28 823548T TIE STRAP
29 822158 BOOT
30 821827 RETAINER
31 25-26855 O-RING, (1.609 x .139)
32 25-85594 O-RING, (.239 x .174)
33 12-814803 WASHER
34 827865A1 SHIFT SHAFT Comment: (LONG)
35 12-8M0204649 WASHER, (.281 x .500 x .060) Stainless Steel
36 17-85593 PIN, (.078 x .437)
37 8213161 CAM, Shift
38 17-822369 PIN, (.125 x .625)
Gear Housing(PROPELLER SHAFT)(2.41:1 GEAR RATIO) (37 parts) Gear Housing(PROPELLER SHAFT)(2.41:1 GEAR RATIO)
Ref OEM Part # Part Name
- 823547A03 SEAL KIT, Gear Housing
1 1682-821306T12 GEAR HOUSING ASSEMBLY, Basic
39 17-821327 PIN, Dowel
40 27-823942 GASKET
41 32-8M0026108 TUBE
42 19-824928001 PLUG, Rubber Comment: SN# USA-0T980000/BEL-0P325500 & Up
43 821829 SCREEN
44 822157T2 TRIM TAB
45 10-82497020 SCREW, (M8 x 20)
46 12-72397 WASHER
47 43-833000A2 GEAR ASSEMBLY, Forward (29 TEETH)
48 31-8M0103470 BEARING ASSEMBLY, Roller
49 NSS NOT SOLD SEPARATE, Cup
50 31-41326 BEARING, Roller
51 821578 FOLLOWER, Cam
52 24-8261991 SPRING
53 17-8M0020999 PIN
54 52-821314T CLUTCH
55 24-38114 SPRING
56 44-8M0140441 PROPELLER SHAFT
57 43-833001T GEAR, Reverse (29 TEETH)
58 30-20839T BEARING, Ball
59 8M0168900 CARRIER ASSEMBLY, Bearing
60 25-815460 O-RING
61 31-21700 BEARING, Needle
62 26-8M0205511 SEAL, Oil
63 26-8M0203757 SEAL, Oil
64 12-855941 WASHER, (.323 x .590 x .112) Stainless Steel
65 10-85594030 SCREW, (M8 x 30)
66 8227731 INSERT, Threaded
67 NSS NOT SOLD SEPARATE, Decal (2.42:1)(12 x 29)
68 73345A1 THRUST HUB
69 11-69578Q1 PROP NUT KIT
70 14-8M0214942 TAB WASHER
71 10-4000380 SCREW, (M10 x 45)
72 12-8M0214963 WASHER, (.406 x .750 x .105) Stainless Steel
73 19-95925 PLUG
Intake (14 parts) Intake
Ref OEM Part # Part Name
- 27-830270A02 GASKET SET
1 25-33466 O-RING
2 8536451 ISOLATOR, Carburetor
3 830277F01 DIFFUSER Comment: SN# USA-0T801000/BEL-0P268000 & Up
4 855219 INSERT
5 878431 SEAL
6 10-8248326 SCREW, (M6 x 25 MM)
7 10-821704100 SCREW, M6 x 100
8 855838 CLAMP
9 32-854787A1 HOSE ASSEMBLY, Breather, To Breather Cover
10 855837 SEAL
11 832011A2 INTAKE ASSEMBLY, Air
12 54-28700 CLAMP
13 10-8248324 SCREW, (M6 x 16)
Intake/Exhaust Valves (16 parts) Intake/Exhaust Valves
Ref OEM Part # Part Name
- 830271T4 CYLINDER HEAD Comment: (MANUAL)
1 8M0119204 VALVE, Exhaust
2 832990T1 VALVE, Intake
3 12-825044 WASHER, Valve Spring
4 26-822647 SEAL, Valve Stem
5 24-823678 SPRING, Valve Outer
6 822650 RETAINER
7 28-893554 KEY
8 898821A01 ROCKER ARM
9 10-825046 SCREW
10 11-826150 NUT
11 8M0011790 SHAFT, Rocker
12 NSS NOT SOLD SEPARATE, Plug
13 825050 BRACKET
14 24-825052 SPRING
15 10-82641030 SCREW, (M8 x 30)
Linkage (33 parts) Linkage
Ref OEM Part # Part Name
1 10-40011158 SCREW, (M8 x 70) Stainless Steel Comment: (ELECTRIC NON HANDLE)
2 10-8147763 SCREW, (M6 x 60) Comment: (ELECTRIC NON HANDLE)
3 11-401196 NUT, (M6) Comment: (ELECTRIC NON HANDLE)
4 42942 CAP Comment: (ELECTRIC NON HANDLE)
5 822682A4 LEVER ASSEMBLY, Throttle Comment: (ELECTRIC NON HANDLE)
6 883160 RETAINER Comment: (ELECTRIC NON HANDLE)
7 23-825078 BUSHING Comment: (ELECTRIC NON HANDLE)
8 822459 RETAINER Comment: (ELECTRIC NON HANDLE)
9 8259571 LEVER, Shift Comment: (ELECTRIC NON HANDLE)
10 882820 SHIFT ROD Comment: (ELECTRIC NON HANDLE)
11 830307 ROD, Throttle Comment: (ELECTRIC NON HANDLE)
12 23-8M0215006 BUSHING Comment: (ELECTRIC NON HANDLE)
13 827706A4 BRACKET Comment: (ELECTRIC NON HANDLE)
14 98889 LATCH Comment: (ELECTRIC NON HANDLE)
15 10-8248324 SCREW, (M6 x 16) Comment: (ELECTRIC NON HANDLE)
16 23-15885 SLEEVE Comment: (ELECTRIC NON HANDLE)
17 12-8M0204649 WASHER, (.281 x .500 x .060) Stainless Steel Comment: (ELECTRIC NON HANDLE)
18 18-210711 COTTER PIN Comment: (ELECTRIC NON HANDLE)
19 830305 CAM, Throttle
20 23-822389 BUSHING
21 12-8M0214930 WASHER
22 10-40011131 SCREW, (M6 x 35) Stainless Steel
23 826588A4 SHIFT SHAFT ASSEMBLY, Horizontal
24 8277071 RETAINER
25 24-826077 SPRING, Detent
26 24-824993 SPRING, Backing
27 824994 SPRING, Plate
28 10-40011107 SCREW, (M5 x 16) Stainless Steel
29 87-8M0052927 SWITCH Comment: (ELECTRIC HANDLE MODELS)
30 10-88075020 SCREW, (M3 x 20) Comment: (ELECTRIC HANDLE MODELS)
31 824923 PLATE Comment: (ELECTRIC HANDLE MODELS)
32 8214943 BRACKET Comment: (HANDLE MODELS)
33 10-8248324 SCREW, (M6 x 16) Comment: (HANDLE MODELS)
Manual Starter (34 parts) Manual Starter
Ref OEM Part # Part Name
- 835253A13 STARTER ASSEMBLY, Recoil Comment: SN# USA-0T901307/BEL-0P294184 & Up
1 835253A12 HOUSING ASSEMBLY, Recoil Comment: SN# USA-0T901307/BEL-0P294184 & Up
2 8167122 CAM
3 24-8267911 SPRING
4 8M0026455 SEAL
5 835256T ROLLER
6 23-852987T BUSHING
7 826414T WASHER
8 10-82684430 SCREW, (M6 x 30)
9 13-826229 LOCKWASHER
10 24-86857T01 SPRING
11 50-854317T5 SHEAVE ASSEMBLY, Starter
12 868501 CAM
13 24-86851T02 SPRING
14 53-86849T01 RING, Retaining
15 24-868523 SPRING
16 86853T01 CAM
17 10-826253 SCREW, (.250-20 x .625)
18 50-12066Q10 ROPE
19 856073 LEVER, Interlock
20 856072T RETAINER
21 24-856138T03 SPRING
22 854779T BUSHING
23 10-8182491 SCREW, (#10-16 x 1.00)
24 85174A1 HANDLE ASSEMBLY
25 NSS NOT SOLD SEPARATE, Retainer
26 10-8248326 SCREW, (M6 x 25 MM)
27 856754003 CABLE, Interlock Comment: SN# USA-0T901307/BEL-0P294184 & Up
28 10-40011107 SCREW, (M5 x 16) Stainless Steel Comment: SN# USA-0T901307/BEL-0P294184 & Up
29 12-73288 WASHER, (.220 x .500 x .030) Stainless Steel
30 18-26811 COTTER PIN
31 10-40011107 SCREW, (M5 x 16) Stainless Steel
32 54-54457 J CLIP
33 10-4006731 SCREW, (M6 x 16)
Power Trim (27 parts) Power Trim
Ref OEM Part # Part Name
- 84-826802T28 HARNESS ASSEMBLY, Trim
1 822344T14 POWER TRIM ASSEMBLY
2 893931A01 SHOCK ROD ASSEMBLY
3 827671A1 PILOT CHECK ASSEMBLY
4 827672A1 TILT RELIEF VALVE ASSEMBLY
5 827673A1 SEAT ASSEMBLY, Suction
6 827674A1 PUMP ASSEMBLY
7 NSS NOT SOLD SEPARATE, Spring/down Relief Ball
8 NSS NOT SOLD SEPARATE, Screw (10-32 x 1-1/4 Inches)
9 NSS NOT SOLD SEPARATE, Filter
10 NSS NOT SOLD SEPARATE, Seal Ring
11 827675A1 MOTOR ASSEMBLY
12 NSS NOT SOLD SEPARATE, Screw (1/4-28 x 5/8 Inch)
13 88238A15 CABLE ASSEMBLY
14 NSS NOT SOLD SEPARATE, Lockwasher
15 NSS NOT SOLD SEPARATE, O Ring
16 NSS NOT SOLD SEPARATE, Coupler
17 827676 PISTON, Memory
18 893929A01 MANUAL RELEASE ASSEMBLY
19 19-811613 PLUG ASSEMBLY
20 84-826802T20 HARNESS ASSEMBLY, Trim
21 8M0207773 RELAY ASSEMBLY
22 828102 BRACKET
23 25-818967 GROMMET
24 23-8M0214955 BUSHING
25 NSS NOT SOLD SEPARATE, Decal-Trim Relay
26 10-82684430 SCREW, (M6 x 30)
Power Trim Mounting (14 parts) Power Trim Mounting
Ref OEM Part # Part Name
1 17-822481001 PIN, (14 mm) Comment: SN# USA-0T980000/BEL-0P325500 & Up
2 23-822482 BUSHING
3 23-822484 BUSHING
4 12-825190 WASHER
5 11-826712 NUT
6 10-4009040 SCREW, (M10 x 40) Stainless Steel
7 12-4002319 WASHER
8 11-40140 NUT, (M10)
9 10-878609 SCREW, (#10-16 x .600)
10 8M0084613 C WASHER
11 54-22740 CLIP
12 17-821539 PIN, Trilobe
13 17-822480 PIN, Pivot
14 23-823507 BUSHING
Powerhead Gasket Set Components (2 parts) Powerhead Gasket Set Components
Ref OEM Part # Part Name
- 27-830270A02 GASKET SET
0 27-8M0204692 GASKET, Driveshaft Housing Plug
Service/Support Material (1 parts) Service/Support Material
Ref OEM Part # Part Name
0 90-10183050 OWNERS MANUAL Comment: (2005/2006)
Starter Motor (11 parts) Starter Motor
Ref OEM Part # Part Name
1 50-893886T STARTER MOTOR ASSEMBLY Comment: (Complete Only) SN# USA-1B227000 & Up
2 10-965662 THRU BOLT Comment: SN# USA-1B226999 & Below
3 891752 DRIVE KIT Comment: SN# USA-0T801000/BEL-0P268000 THRU USA-1B226999
4 891753 ARMATURE Comment: SN# USA-0T801000/BEL-0P268000 THRU USA-1B226999
5 68575T2 PINION Comment: SN# USA-0T801000/BEL-0P268000 THRU USA-1B226999
6 8236392 DRIVE CAP Comment: SN# USA-1B226999 & Below
7 8119011 CAP, Commutator Comment: SN# USA-1B226999 & Below
8 898265016 BRUSH/SPRING KIT Comment: SN# USA-1B226999 & Below
9 898265014 HOLDER Comment: SN# USA-1B226999 & Below
10 F15158 SCREW Comment: SN# USA-1B226999 & Below
11 37-8272822 DECAL, Warning, High Voltage
Steering Arm (28 parts) Steering Arm
Ref OEM Part # Part Name
1 11-896963 NUT, (M12)
2 893773002 STRAP
3 826267T3 MOUNT
4 10-8M0204741 SCREW, (M6 x 20) Stainless Steel
5 8M0156878 BUMPER
6 53-89531 RING, Retaining
7 8M0118183 ARM, Steering
8 10-898835001 BOLT, (M12 x 154)
9 23-8279971 SPACER Comment: (LONG)
10 826233T3 SWIVEL TUBE Comment: (LONG)
11 84-88238T01 CABLE ASSEMBLY
12 8M0207768 CABLE ASSEMBLY, Ground
13 10-823567105 SCREW, (M10 x 105) Hex Flange - Stainless Steel
14 893703 BRACKET
15 10-878607 SCREW, (#10-16 x .375)
16 11-40140 NUT, (M10)
17 11-8M0204726 NUT, (.375-24) Stainless Steel Comment: (HANDLE)
18 823792 LEVER Comment: (HANDLE)
19 12-29330 WASHER Comment: (HANDLE)
20 821961 ROD (THREADED) Comment: (HANDLE)
21 8M0006845 PLATE/DISC ASSEMBLY Comment: (HANDLE)
22 NSS NOT SOLD SEPARATE, Disc Comment: HANDLE
23 8M0007471 PLATE Comment: (HANDLE)
24 8165621 DISC Comment: (HANDLE)
25 10-768042 SHOULDER SCREW, Hex Comment: (HANDLE)
26 8M0184092 BRACKET Comment: (ELECTRIC)
27 14-8M0009820 TAB WASHER Comment: (ELECTRIC)
28 10-4000377 SCREW, (M10 x 30) Comment: (ELECTRIC)
Swivel Bracket (27 parts) Swivel Bracket
Ref OEM Part # Part Name
1 19608A14 ATTACHING KIT, Engine Steering Comment: (NON HANDLE)
2 10-823919 SCREW, (.375-24 x 1.500) Comment: (NON HANDLE)
3 12-8M0109680 WASHER, (.390 x .546 x .12) Comment: (NON HANDLE)
4 12-37828 WASHER, (.390 x .625 x .062) Stainless Steel Comment: (NON HANDLE)
5 11-8M0204726 NUT, (.375-24) Stainless Steel Comment: (NON HANDLE)
6 822397 PUCK Comment: (ELECTRIC)
7 3410-827402T5 SWIVEL BRACKET Comment: SN# USA-0T801000/BEL-0P268000 & Up
8 23-8217711 BUSHING
9 23-821777 BUSHING (LOWER)
10 26-8M0205512 SEAL
11 22-8M0169589 FITTING, Grease
12 22-8M0169589 FITTING, Grease Comment: (HANDLE)
13 19624A1 SEAL KIT Comment: (NON HANDLE)
14 25-29619 O-RING, (.583 x .103) Comment: (NON HANDLE)
15 23-78861 SPACER Comment: (NON HANDLE)
16 12-19619 WASHER
17 11-858869 NUT, (.875-14)
18 NSS NOT SOLD SEPARATE, Decal-Serial Overlaminate
19 10-40011149 SCREW, (M8 x 25) Stainless Steel Comment: (ELECTRIC)
20 8282451 SEAL Comment: (ELECTRIC)
21 12-19619 WASHER
22 8M0041938 TILT TUBE
23 11-858869 NUT, (.875-14)
24 17-821539 PIN, Trilobe
25 23-823507 BUSHING
26 17-822480 PIN, Pivot (UPPER)
27 37-8237011 DECAL, Co-Pilot
Swivel Bracket(Remote Control) (38 parts) Swivel Bracket(Remote Control)
Ref OEM Part # Part Name
1 19608A14 ATTACHING KIT, Engine Steering
2 10-823919 SCREW, (.375-24 x 1.500)
3 12-8M0109680 WASHER, (.390 x .546 x .12)
4 12-37828 WASHER, (.390 x .625 x .062) Stainless Steel
5 11-8M0204726 NUT, (.375-24) Stainless Steel
6 822397 PUCK
7 3410-827402T5 SWIVEL BRACKET Comment: SN# USA-0T801000/BEL-0P268000 & Up
8 23-8217711 BUSHING (UPPER)
9 22-8M0169589 FITTING, Grease
10 23-821777 BUSHING (LOWER)
11 26-8M0205512 SEAL
12 12-19619 WASHER
13 11-858869 NUT, (.875-14)
14 18-26811 COTTER PIN
15 821799002 PIN, Pivot, Reverse Lock Comment: SN# USA-0T801000/BEL-0P268000 & Up
16 NSS NOT SOLD SEPARATE, Decal-Serial Overlaminate
17 10-40011149 SCREW, (M8 x 25) Stainless Steel
18 8282451 SEAL
19 12-19619 WASHER
20 8M0041938 TILT TUBE
21 11-858869 NUT, (.875-14)
22 17-821539 PIN, Trilobe
23 23-823507 BUSHING
24 17-822480 PIN, Pivot (UPPER)
25 8217751 STRAP
26 821800 LINK (UPPER)
27 8217981 LEVER
28 6-32,11-8M0207777 NUT,
29 826578 PIN
30 24-F366300 SPRING
31 8M0026107 LINK
32 12-71055 WASHER
33 825181003 ARM
34 8289861 LOCK, Reverse
35 10-32,11-8M0204718 NUT,
36 19624A1 SEAL KIT
37 25-29619 O-RING, (.583 x .103)
38 23-78861 SPACER
Tiller Handle (43 parts) Tiller Handle
Ref OEM Part # Part Name
- 37-8M0032728 DECAL, Lanyard, Black
1 822148A8 COVER KIT
2 822150 PULLEY
3 NSS NOT SOLD SEPARATE, Case
4 10-878608 SCREW, (#10-16 x .500)
5 4324214 CABLE ASSEMBLY, Throttle (26.50 Inches) Comment: (26-1/2 IN.)
6 4324215 CABLE ASSEMBLY, Throttle (27.50 Inches) Comment: (27-1/2 IN.)
7 85-960099 SLEEVE, (12.00 Inches)
8 10-82526225 SCREW, (M8 x 25 MM)
9 8M0072298 COVER
10 23-821477 BUSHING
11 822325T1 ARM, Steering Handle
12 822441 RETAINER
13 10-40011107 SCREW, (M5 x 16) Stainless Steel
14 10-8M0204707 SCREW, (M6 x 25)
15 892995 LOCK, Throttle Comment: SN# USA-0T980000/BEL-0P325500 & Up
16 24-96203 SPRING
17 821972T KNOB, Throttle
18 821463T01 TILLER TUBE
19 37-8242004 DECAL
20 821465 HANDLE, Throttle
21 8M0221732 GRIP
22 87-8M0104611 SWITCH, Stop Comment: (STOP)
23 10-82239312 SCREW, (M5 x 12)
24 12-8M0214930 WASHER
25 84-8M0088388 ALARM
26 823687 CLIP
27 87-11083A31 SWITCH, Stop Comment: (STOP)
28 8M0032846 RETAINER, Brass
29 821455A4 BRACKET, Tiller
30 13-826792 WAVE WASHER
31 23-821477 BUSHING
32 12-827314 WASHER
33 32-828547633 CONDUIT, (.620 Inside Diameter x 3.00 Feet Bulk)
34 54-816311T TIE STRAP, (8.00 Inches)
35 37-82409316 DECAL, F-N-R Shift
36 14-8M0009820 TAB WASHER
37 10-82484890 SCREW, (M10 x 90)
38 15920Q54 LANYARD ASSEMBLY
39 10-40011151 SCREW, (M8 x 35) Stainless Steel
40 830180A01 HANDLE
41 23-830181 BUSHING
42 8301821 SHIFT ROD
Tools, Special (1 parts) Tools, Special
Ref OEM Part # Part Name
0 91-8M0162977 TOOL KIT
Top Cowl (19 parts) Top Cowl
Ref OEM Part # Part Name
1 4027-830562T6 TOP COWL ASSEMBLY Comment: (MANUAL) (SILVER)
2 4027-830562T8 TOP COWL ASSEMBLY Comment: (ELECTRIC) (SILVER)
3 NSS NOT SOLD SEPARATE, Induction Insert
4 854318 INSERT, Cowl Comment: (MANUAL)
5 826291F1 LATCH Comment: (SILVER)
6 10-8231871 SCREW, (M4 x 14.5)
7 8,13-26995 LOCKWASHER, Stainless Steel
8 11-8237515 NUT, (M4)
9 8M0153618 SEAL
10 852556A02 SOUND BLANKET KIT Comment: SN# 1B227000 & Up
11 NSS NOT SOLD SEPARATE, Sound Blanket-Top Comment: ELECTRIC
12 NSS NOT SOLD SEPARATE, Sound Blanket-Top Comment: MANUAL
13 893763 BRACKET ASSEMBLY, Latch Roller
14 10-4006731 SCREW, (M6 x 16)
15 8M0038412 BRACKET
16 10-8231871 SCREW, (M4 x 14.5)
17 8,13-26995 LOCKWASHER, Stainless Steel
18 11-8237515 NUT, (M4)
19 47341A11 ROPE AND HANDLE KIT, Manual Starting

100-Hour / Annual Service Checklist

Regular maintenance keeps your Mercury 25 (4-STROKE) 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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