Westerbeke 42B Four Marine
Westerbeke Westerbeke 42B Four · 42B-FOUR family: specifications, its industrial/tractor base engine, cross-referenced parts and where to buy them.
🚜 Base engine confirmed
The Westerbeke 42B-Four is a marinized Mitsubishi K4F block (K4F-62WM); internals cross to Mitsubishi K4F part numbers. source
42 hp30.9 kW
1490 ccdisplacement
78×78 mmbore × stroke
4-cylcylinders
1987–1999year range (approx)
NAaspiration
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 42B 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
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
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
📚 Manuals & Sources
Specs— none yet
Operator's Manual
Service / Workshop Manual— none yet
Parts Catalog / List
External links — we host none of these documents.
Westerbeke 42B Four — Affiliate Parts Search
eBay and AliExpress links are affiliate links. They help pay for the site, at no extra cost to you. More
- Category
- Marine
- Engine family
- 42B-FOUR
- Year range (approx)
- 1987–1999
- Cylinders
- 4
- Rated output
- 42 hp (30.9 kW)
- Bore × stroke
- 78 × 78 mm
- Displacement
- 1490 cc
- Max rpm
- 3600
- Aspiration
- Naturally aspirated