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Westerbeke 20B marine engine

Westerbeke 20B

1987–200518 HP2-cylinderdiesel
Dieselheat exchanger cooledinboard
Manufacturer PageDocumentation

Two-cylinder. Common in Catalina, Hunter, and other 27-33ft boats.

Specifications

Power18 HP @ 3,600 RPMCylinders2
Displacement635 cc (38.8 ci)Bore x Stroke75 x 72 mm
Fuel TypeDieselAspirationNaturally Aspirated
CoolingHeat exchangerDriveInboard
Weight115 kg (253 lb)Fuel Use3.38 L/hr

Parts for the Westerbeke 20B

10 catalogued parts. Prices are reference figures; each “Find on Amazon” link opens a search for that part — confirm fitment against your engine's serial before ordering.

Cooling System (2)
  • IMPELLER KIT
    $44.10
    Buy onAmazon ↗
  • Pressure Cap
    fits: Universal M-50B Universal M-12 Universal M-15 Universal M-18 Universal M-20 Universal M-25
    $10.80
    SearchAmazon →
Fuel System (2)
  • Fuel Hardware Kit
    fits: Westerbeke 12C Two, 20B Two, 30B Three
    $148.60
    SearchAmazon →
  • Fuel Filter
    fits: Westerbeke W13, W21, W27, W33, 12C Two, 20B Two, 30B Three, 38B Four, 44A Four, 44B Four,
    $14.40
    SearchAmazon →
Lubrication (1)
  • Oil Filter
    fits: Westerbeke 11A One, W13, W21, W27, 12B Two, 12C Two, 20B Two, 30B Three, 35D Three, 44A Fo
    $16.40
    Buy onAmazon ↗
Belts (1)
  • Alternator Belt Std.
    fits: Westerbeke 20B Two, 30B Three, 12C Two
    $75.70
    SearchAmazon →
Anodes (1)
  • Zinc
    fits: Universal M-25 XPB, 12C Two, 20B Two, 30B Three, 35D Three, 38B Four, 44A Four, 44B Four,
    $14.60
    SearchAmazon →
Electrical (1)
  • Glowplug
    fits: Westerbeke 12C Two, 20B Two, 30B Three
    $66.70
    eBay· $40.29 ↗
Service Kits (2)
  • Spare Parts Kit "B"
    fits: Westerbeke 12C Two|Westerbeke 20B Two
    $1,832.90
    SearchAmazon →
  • Spare Parts Kit "A"
    fits: Westerbeke 12C Two|Westerbeke 20B Two
    $361.20
    SearchAmazon →

Part data aggregated from marine-diesel parts catalogues. As an Amazon Associate, SailPages earns from qualifying purchases.