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
97 kgengine dry
13 kggearbox
from 2000year range (approx)
NAaspiration
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
Cooling
Crankshaft & Pistons
Electrical
Fig 16 — M3-20B Alternator AssemblyFig 18 — M3-20B Electrical SystemFig 19 — M3-20B Propulsion Instrument Panels
Engine Block & Head
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
Lubricating
Miscellaneous
Transmission & Mounting
Valve Train
📚 Manuals & Sources
Specs
- Advanced Specifications Mfr Westerbeke
Operator's Manual— none yet
Service / Workshop Manual— none yet
Parts Catalog / List
- Parts Manual 201009 Mfr Westerbeke
External links — we host none of these documents.
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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
- Dry weight (engine)
- 97 kg
- Gearbox
- 13 kg
- With standard gearbox
- 110 kg