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Westerbeke W-21 marine engine

Westerbeke W-21

1980–198821 HP3-cylinderdiesel
Dieselheat exchanger cooledinboard
Manufacturer PageDocumentation

Three-cylinder. Common in 28-35ft boats.

Specifications

Power21 HP @ 3,000 RPMCylinders3
Displacement901.3 cc (55.0 ci)Bore x Stroke72 x 72 mm
Fuel TypeDieselAspirationNaturally Aspirated
CoolingHeat exchangerDriveInboard
Weight154 kg (340 lb)Fuel Use3.94 L/hr

Parts for the Westerbeke W-21

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 (1)
  • 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 (3)
  • Fuel Hardware Kit
    fits: Westerbeke W13, W21, W33, W27, 38B Four, W13A, W18, W21A, W33A, W27A, 42B Four, 35B Three
    $187.50
    eBay· $60.00 ↗
  • Filter (electric lift pump)
    fits: Westerbeke W13, W21, W27, W33, W52, 12C Two, 38B Four, 63B Four, 63C Four, W13A, W18, W21A
    $32.00
    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 W21, W27, W18, W21A, W27A
    $24.00
    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 W13, W21, W27, W33, 38B Four, 44A Four, 44B Four, 63B Four, 63C Four, W13A, W18
    $161.70
    eBay· $26.95 ↗
Service Kits (2)
  • Spare Parts Kit "B"
    fits: Westerbeke W18, W21, W21A
    $1,917.10
    SearchAmazon →
  • Spare Parts Kit A
    fits: Westerbeke W18, W21, W21A, W27, W27A
    $433.90
    SearchAmazon →

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