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Universal M3-20 Marine

Universal Universal M3-20 · M3 family: specifications, its industrial/tractor base engine, cross-referenced parts and where to buy them.

🚜 Base engine confirmed

The Universal M3-20 (18hp 3-cyl) is based on the Kubota D-640 block (Kubota G-6200 mower engine). source

18 hp13.2 kW
719 ccdisplacement
67×68 mmbore × stroke
3-cylcylinders
NAaspiration
📋 Full specifications 🚜 Industrial / tractor base 🔧 Aftermarket 9
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 · 42 assemblies

The exploded parts diagrams for the Universal M3-20, grouped by system. Open a figure for its callout part numbers and per-variant quantities.

Body

Fig 1 — Oil PAN GROUPFig 4 — MAIN BEARING CASE GROUPFig 9 — IDUNG APPARATUS GROUPFig 12 — NOZZLE HOLDER GROUPFig 12 — M3-20B Raw Water PumpFig 13 — SPEED CONTROL PLATE GROUPFig 16 — WATER PUMP GROUPFig 17 — M3-20B Throttle AssemblyFig 18 — NAME PLATE GROUPFig 21 — THROTTLE BRACKET GROUPFig 22 — SHERWOOD WATER PUMP 1\1 O. 302

Cooling

Fig 5 — M3-20B Exhaust Manifold and Heat ExchangerFig 11 — M3-20B Cooling SystemFig 20 — HEAT EXCHANGER GROUP

Crankshaft & Pistons

Fig 10 — PISTON. CRANKSHAFT GROUPFig 11 — FLYWHEEL GROUPFig 14 — M3-20B Flywheel and Starter Assembly

Electrical

Fig 16 — M3-20B Alternator AssemblyFig 18 — M3-20B Electrical SystemFig 19 — ALTERNATOR GROUPFig 19 — M3-20B Propulsion Instrument Panels

Engine Block & Head

Fig 2 — CYLINDER HEAD GROUPFig 2 — M3-20B Cylinder Head AssemblyFig 5 — HEAD COVER GROUP

Fuel

Fig 9 — M3-20B Nozzle Holder and InjectorsFig 10 — M3-20B Governor AssemblyFig 13 — M3-20B Fuel Filter and Oil Drain Hose SystemsFig 14 — GOVERNOR GROUPFig 17 — FUEL FitTER GROUP

Inlet & Exhaust

Fig 4 — M3-20B Cylinder Head Cover and Air IntakeFig 6 — INLET MANIFOLD GROUP

Lubricating

Fig 1 — M3-20B Oil Pan Assembly, Lube Oil Switch and Sender

Miscellaneous

Fig 20 — M3-20B Miscellaneous

Transmission & Mounting

Fig 3 — GEAR CASE GROUPFig 3 — M3-20B Gear Case AssemblyFig 15 — M3-20B Bell Housing and Transmission

Valve Train

Fig 6 — M3-20B Fuel Injection Pump and Fuel CamshaftFig 7 — VALVE ROCKER ARM GROUPFig 7 — M3-20B Valve Rocker Arm AssemlyFig 8 — CAMSHAFT GROUPFig 8 — M3-20B Camshaft AssemblyFig 15 — FUEL CAMSHAFT GROUP
📚 Manuals & Sources
Specs
Operator's Manual— none yet
Service / Workshop Manual— none yet
Parts Catalog / List
More📖 Boat Inboard Engine Manuals Boat Manuals

External links — we host none of these documents.

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Category
Marine
Engine family
M3
Cylinders
3
Rated output
18 hp (13.2 kW)
Bore × stroke
67 × 68 mm
Displacement
719 cc
Max rpm
3600
Aspiration
Naturally aspirated

Related M3 engines

Universal M3-20AUniversal M3-20BUniversal M3-20BC