Universal M-25 Marine
Universal Universal M-25 · M family: specifications, its industrial/tractor base engine, cross-referenced parts and where to buy them.
🚜 Base engine confirmed
The Universal M-25 (21hp 3-cyl) is based on the Kubota D-850 block. source
21 hp15.4 kW
852 ccdisplacement
3-cylcylinders
1981–1986year range (approx)
NAaspiration
Cheaper-part coverage · 6/8
🚜 Base engine ✓🌀 Impeller ✓💧 Raw-water pump🛢️ Oil filter ✓⛽ Fuel filter ✓🌡️ Thermostat ✓➰ Belt⚓ Anode ✓
A ✓ means at least one cheaper channel — aftermarket, the tractor/industrial base engine, or a standard component — exists for this engine in that category.
Parts by section · 51 assemblies
The exploded parts diagrams for the Universal M-25, grouped by system. Open a figure for its callout part numbers and per-variant quantities.
Body
Fig 3 — OIL PAN ASSEMBLY, OIL PRESSURE SWITCH - M-25XPBFig 4 — MAIN BEARING CASE GROUPFig 4 — OIL PAN ASSEMBLY, OIL PRESSURE SWITCH - M-35B M-40BFig 9 — ENGINE STOP LEVER GROUPFig 12 — NOZZLE HOLDER GROUPFig 13 — SPEED CONTROL PLATE GROUPFig 15 — WATER FLANGE GROUPFig 16 — WATER PUMP GROUPFig 18 — NOZZLE HOLDERFig 19 — NAME PLATE GROUPFig 22 — BELL HOUSING GROUPFig 22 — MODEL HBW VERTICAL SHIFTING BRACKETFig 23 — THROTTLE BRACKET GROUP 256773 THROTTLE ASSEMBLYFig 24 — SHERWOOD WATER 300986 PUMP ~J 5 - -Fig 25 — SHERWOOD WATER PUMP NO. 302648 - ---,
Cooling
Fig 11 — EXHAUST MANIFOLD and HEAT EXCHANGER M-25XPB / M-35B / M-40BFig 20 — FRESH WATER COOLING SYSTEMFig 21 — HEAT EXCHANGER GROUP· OLD STYLE
Crankshaft & Pistons
Fig 1 — CRANKCASE GROUPFig 7 — PISTONS, CRANKSHAFT AND MAIN BEARINGS- M-25XPBFig 8 — PISTONS, CRANKSHAFT AND MAIN BEARINGS - M-35B / M-40BFig 10 — PISTON, CRANKSHAFT GROUPFig 11 — FLYWHEEL GROUP
Electrical
Fig 20 — M-25 AND M-25XP ALTERNATOR MOUNT CONVERSION KITFig 23 — ALTERNATOR ASSEMBLYFig 24 — ELECTRICAL SYSTEMFig 25 — PROPULSION INSTRUMENT PANELS
Engine Block & Head
Fig 1 — CYLINDER BLOCK ASSEMBLY - M-25XPBFig 2 — CYLINDER HEAD GROUPFig 2 — CYLINDER BLOCK ASSEMBLV - M-35 / M-40Fig 5 — HEAD COVER GROUPFig 5 — CYLINDER HEAD ASSEMBLY - M-25XPBFig 6 — CYLINDER HEAD ASSEMBLY M-358 M-408
Fuel
Fig 12 — FUEL FILTER, NOZZLE HOLDERS AND INJECTORS - M-25XPBFig 13 — FUEL FILTER, NOZZLE HOLDERS, INJECTORS - M-35B / M-40BFig 14 — GOVERNOR GROUPFig 17 — FUEL FILTER GROUPFig 18 — THROTTLE AND GOVERNOR ASSEMBLIESFig 19 — FUEL LIFT PUMP, SOLENOID AND FUEL RETURN
Inlet & Exhaust
Miscellaneous
Transmission & Mounting
Valve Train
Fig 7 — VALVE ROCKER ARM GROUPFig 8 — CAMSHAFT GROUPFig 9 — VALVE HEAD COVER AND AIR INTAKE MANIFOLD- M-25XPBFig 10 — VALVE HEAD COVER, AIR INTAKE MANIFOLD M-358 / M-408Fig 14 — FUEL CAMSHAFT AND GOVERNOR SHAFT - M-25XPBFig 15 — FUELCAMSHAFTANDGOVERNORSHAFT-M~5BIM40BFig 16 — VALVES, ROCKER ARMS AND CAMSHAFTS- M-25XPBFig 17 — VALVES, ROCKER ARMS AND CAMSHAFTS - M-358 / M-408
📚 Manuals & Sources
Specs
- Advanced Specifications - Old Model Mfr Westerbeke
Operator's Manual— none yet
Service / Workshop Manual— none yet
Parts Catalog / List
- Parts Manual 200142 Mfr Westerbeke
External links — we host none of these documents.
Universal M-25 — Affiliate Parts Search
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- Category
- Marine
- Engine family
- M
- Year range (approx)
- 1981–1986
- Cylinders
- 3
- Rated output
- 21 hp (15.4 kW)
- Displacement
- 852 cc
- Max rpm
- 3200
- Aspiration
- Naturally aspirated
Related M engines
Universal M-12Universal M-15Universal M-18Universal M-20Universal M-25XPUniversal M-25XPAUniversal M-25XPBUniversal M-25XPBCUniversal M-30Universal M-35Universal M-35AUniversal M-35BUniversal M-35BCUniversal M-40Universal M-40AUniversal M-40BUniversal M-40BCUniversal M-50Universal M-50AUniversal M-50B