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Westerbeke 38B Four Marine

Westerbeke Westerbeke 38B Four · 38B-FOUR family: specifications, its industrial/tractor base engine, cross-referenced parts and where to buy them.

🚜 Base engine confirmed

The Westerbeke 38B-Four is a marinized Mitsubishi K4D block (1305cc 73x78mm); internals cross to Mitsubishi K4D part numbers. source

37 hp27.2 kW
1305 ccdisplacement
73×78 mmbore × stroke
4-cylcylinders
1987–2001year range (approx)
NAaspiration
📋 Full specifications 5 🚜 Industrial / tractor base 282 🔧 Aftermarket 19
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 · 35 assemblies

The exploded parts diagrams for the Westerbeke 38B Four, grouped by system. Open a figure for its callout part numbers and per-variant quantities.

Body

Fig 116 — 35B - 38B - 42B - THROTTLE AND STOP CABLE BRACKETFig 158 — 10.0 BTD - 11. 0 BTD - 12.5 BTDA - AC OUTPUT AND REGULATORFig 174 — 10.0 BTD - 11 .0 BTD - 12.5 BTDA - BELT GUARD

Cooling

Fig 128 — 35B - 38B - 42B - COOLING SYSTEMFig 132 — 10.0 BTD - 11.0 BTD - 12.5 BTDA - COOLING SYSTEMFig 134 — 10. 0 BTD - 1 1 . 0 BTD - 12.5 BTDA - COOLING SYSTEMFig 136 — 3SB - 3SB - 42B - 10.0 BTD - 11.0 BTD - 12.5 BTDA - FRESH WATER PUMPFig 138 — 35B - 38B - 4ZB - 10.0 BTD - 11.0 BTD - 12.5 BTDA - SEA WATER PUMP

Crankshaft & Pistons

Fig 106 — 35B - 3aB - 42B - 10 BTD - 11 BTD - 12.5 BTDA - CRANKSHAFT AND PISTONS

Electrical

Fig 160 — 35B - 38B - 42B - ELECTRICAL SYSTEMFig 162 — 35B - 38B - 42B - INSTRUMENT PANELSFig 164 — 10.0 BTD - 11.0 BTD - 12.5 BTDA - ELECTRICAL SYSTEMFig 166 — 10.0 BTD - 11 . 0 BTD - 12.S BTDA - ELECTRICAL SYSTEMFig 170 — 35B - 38B - 42B - 10.0 BTD - 11.0 BTD - 12.5 BTDA - ALTERNATORFig 172 — 35B - 38B - 42B - 10.0 BTD - 11.0 BTD - 12.5 BTDA - STARTER MOTORS

Engine Block & Head

Fig 1 — 35B - 38B - 42B - 10.0 BTD - 11.0 BTD - 12.5 BTDA - CYLINDER BLOCKFig 102 — 35B - 38B - 42B - 10.0 BTD - 11.0 BTD - 12.5 BTDA - CYLINDER HEAD

Fuel

Fig 114 — 35B - 38B - 42B - 10.0 BTD - 11.0 BTD - 12.5 BTDA - GOVERNOR SYSTEMFig 118 — 35B - 38B - 42B - FUEL SYSTEMFig 122 — 10.0 BTD - 11.0 BTD - 12.5 BTDA - FUEL SYSTEMFig 124 — 10.0 BTD - 11 . 0 BTD - 12.5 BTDA - FUEL SYSTEMFig 126 — 35B - 38B - 42B - 10.0 BTD - 11.0 BTD - 12.5 BTDA - FUEL INJECTOR

Generator

Fig 156 — 10.0 BTD - 11.0 BTD - 12.5 BTDA - GENERATOR - BACK END - MOUNT SYSTEMFig 168 — 10.0 BTD - 11.0 BTD - 12.5 BTDA - GENERATOR CONTROL PANEL

Inlet & Exhaust

Fig 112 — 35B - 38B - 42B - 10.0 BTD - 11.0 BTD - 12.5 BTDA - INTAKE MANIFOLDFig 140 — 35B - 38B - 42B - FRONT OPENING EXHAUST MANIFOLD

Lubricating

Fig 110 — 35B - 38B - 42B - 10.0 BTD - 11.0 BTD - 12.5 BTDA - LUBE OIL PUMP

Miscellaneous

Fig 175 — 35B - 38B - 42B - 10.0 BTD - 11.0 BTD - 12.5 BTDA - MISCELLANEOUS

Transmission & Mounting

Fig 142 — 35B - 38B - 42B - BACK END - MODEL JS TRANSMISSION - MOUNTSFig 146 — 35B - 38B - 42B - MODEL JS TRANSMISSION SHIFTING BRACKETFig 148 — 3SB - 38B - 42B - BACK ENO - MOOEL HBW TRANSMISSION - MOUNTSFig 150 — 35B - 38B - 42B - BACK END - MODEL HBW TRANSMISSION - MOUNTSFig 152 — 35B - 38B - 42B - MODEL HBW TRANSMISSION SHIFTING BRACKET

Valve Train

Fig 103 — 35B - 38B - 42B - 10 BTD - 11 BTD - 12.5 BTDA - TIMING COVER AND SUMPFig 108 — 35B - 38B - 42B - 10 BTD - 11 BTD - 12.5 BTDA - CAMSHAFT-ROCKER SHAFT
📚 Manuals & Sources
Specs— none yet
Operator's Manual
Service / Workshop Manual— none yet
Parts Catalog / List
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Category
Marine
Engine family
38B-FOUR
Year range (approx)
1987–2001
Cylinders
4
Rated output
37 hp (27.2 kW)
Bore × stroke
73 × 78 mm
Displacement
1305 cc
Max rpm
3600
Aspiration
Naturally aspirated