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Westerbeke W21A Marine

Westerbeke Westerbeke W21A · W family: specifications, its industrial/tractor base engine, cross-referenced parts and where to buy them.

🚜 Base engine confirmed

The Westerbeke W21A is a marinized Mitsubishi K3D; internals cross to Mitsubishi K3D part numbers. source

21 hp15.4 kW
983 ccdisplacement
73×78 mmbore × stroke
3-cylcylinders
1984–1987year range (approx)
NAaspiration
📋 Full specifications 7 🚜 Industrial / tractor base 🔧 Aftermarket 12
Cheaper-part coverage · 4/8
🚜 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 · 25 assemblies

The exploded parts diagrams for the Westerbeke W21A, grouped by system. Open a figure for its callout part numbers and per-variant quantities.

Body

Fig 263 — YESTERBEKE 13-18-21-21-33 - FRESH YATER PUMPFig 264 — "'ESTERBEKE 13-18-21-27-33 - FRESH "'ATER PUMPFig 274 — 'WESTER BEKE 13 - GOVERNO~Fig 314 — WESTERBEKE SHIFT CONNECTION ON HBW

Cooling

Fig 256 — W[STERBEKE 18-21A-27l-33A - COOLING SYSTEMFig 265 — WESTERBEKE 4.4 BCD - 6.0 BCD - SEA WATER PUMP 3

Crankshaft & Pistons

Fig 205 — WESTERBEKE 13-18-21-27-33 - CRANKSHAFT AND PISTONS

Electrical

Fig 321 — WESTERBEKE 8.0 BTD - CONTROL PANELFig 334 — WESTERBEKE 13-18-21-27-33 - ALTERNATOR

Engine Block & Head

Fig 204 — WESTERBEKE 18-21-27-33 - CYLINDER BLOCK

Fuel

Fig 302 — WESTERBEKE 13-18-21-21-33 - FUEL INJECTOR

Generator

Fig 250 — WES TERBEKE BC-4.4KW - COOLING SYSTEMFig 262 — WESTERBEKE BT-8KW - COOLING SYSTEMFig 280 — WESTERBEKE 4.4-7.7-B-11-12 .. 5KW - FUEL S:lLENOIDFig 300 — - - WESTERBEKE BC-6K W BT-8KW FUE L SYSTEMFig 320 — WESTERBEKE 4.4-7.7-11-12.5KW - SYSTEM ELECT~ICALFig 335 — WESTERBEKE BC-4.4KW - BC-6KW - GENERATOR - BACK END - MOUNTFig 342 — WESTERBEKE BC-4.4KW - BC-6KW - AC OUTPUT GENER~TORFig 343 — WESTERBEKE 8.0 BTD - GENERATOR - BACK END - MOUNTING SYSTEMFig 350 — WESTERBEKE 4.4-7.7-11-12.5KW - GENERATOR MOUNTING SYSTt.MFig 352 — WESTER BEKE 4.4-7.7-11-12.5KW - GENERATOR 2 OR '+ WIPE 60 HERTZFig 360 — WESTERBEKE 4.4-7.7-11-12.5KW - GENERATIJR :3 WIRE 60 HERTZ

Inlet & Exhaust

Fig 234 — WESTERBEKE EXTRUDED EXHAUST MANIFOLD

Valve Train

Fig 206 — UESTERBEKE 13-18-21-27-33 - CAMSHAFT AND ROCKER SHAFTFig 207 — WESTERBEKE 13-18-21-27-33 - CAMSHAFT AND ROCKER SHAFT
📚 Manuals & Sources
Specs— none yet
Operator's Manual
Service / Workshop Manual— none yet
Parts Catalog / List— none yet
More📖 Boat Inboard Engine Manuals Boat Manuals

External links — we host none of these documents.

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Category
Marine
Engine family
W
Year range (approx)
1984–1987
Cylinders
3
Rated output
21 hp (15.4 kW)
Bore × stroke
73 × 78 mm
Displacement
983 cc
Max rpm
3000
Aspiration
Naturally aspirated

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