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Universal M3-20B Marine

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

🚜 Base engine likely

The later Universal M3-20B (719cc 20hp) is a marinized Kubota 3-cyl D-series block in the D640/D722 family. source

20 hp14.7 kW
719 ccdisplacement
67×68 mmbore × stroke
3-cylcylinders
from 2000year range (approx)
NAaspiration
📋 Full specifications 14 🚜 Industrial / tractor base 419 🔧 Aftermarket 6
Cheaper-part coverage · 5/8
🚜 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 · 20 assemblies

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

Body

Fig 12 — M3-20B Raw Water PumpFig 17 — M3-20B Throttle Assembly

Cooling

Fig 5 — M3-20B Exhaust Manifold and Heat ExchangerFig 11 — M3-20B Cooling System

Crankshaft & Pistons

Fig 14 — M3-20B Flywheel and Starter Assembly

Electrical

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

Engine Block & Head

Fig 2 — M3-20B Cylinder Head Assembly

Fuel

Fig 9 — M3-20B Nozzle Holder and InjectorsFig 10 — M3-20B Governor AssemblyFig 13 — M3-20B Fuel Filter and Oil Drain Hose Systems

Inlet & Exhaust

Fig 4 — M3-20B Cylinder Head Cover and Air Intake

Lubricating

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

Miscellaneous

Fig 20 — M3-20B Miscellaneous

Transmission & Mounting

Fig 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 — M3-20B Valve Rocker Arm AssemlyFig 8 — M3-20B Camshaft Assembly
📚 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.

Universal M3-20B — Affiliate Parts Search

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Category
Marine
Engine family
M3
Year range (approx)
from 2000
Cylinders
3
Rated output
20 hp (14.7 kW)
Bore × stroke
67 × 68 mm
Displacement
719 cc
Max rpm
3600
Aspiration
Naturally aspirated

Related M3 engines

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