Home / Engines / Universal M-25
Universal M-25 marine engine

Universal M-25

1985–199720 HP3-cylinderdiesel
Dieselheat exchanger cooledinboard
Manufacturer PageDocumentation

Three-cylinder diesel. Very popular Atomic 4 replacement. Kubota-based.

Specifications

Power20 HP @ 3,200 RPMCylinders3
Displacement820 cc (50.0 ci)Bore x Stroke72 x 67 mm
Fuel TypeDieselAspirationNaturally Aspirated
CoolingHeat exchangerDriveInboard
Weight129 kg (285 lb)Fuel Use3.75 L/hr

Parts for the Universal M-25

12 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 (3)
  • Impeller Kit
    $73.10
    Buy onAmazon ↗
  • thermostat element, 160 degree
    fits: 301358
    SearchAmazon →
  • sea water pump (raw water pump), new style Sherwood
    fits: 302648
    Buy onAmazon ↗
Fuel System (3)
  • Fuel Filter
    fits: Universal M-35B, M-50B, M-15, M3-20, M-12, M-18, M-20, M-25, M-25XP, M-35, M3-20B, M4-30,
    $37.40
    Buy onAmazon ↗
  • Fuel Lift Pump Filter
    fits: Universal M-12, M-18, M-20, M-25, M-25XP, M-30, M-35, M-40, M4-30, M-50, M2-12, M3-20, M3-
    $20.40
    Buy onAmazon ↗
  • Air Filter
    fits: Universal M-35B, M-50B
    $17.00
    SearchAmazon →
Lubrication (1)
  • Oil Filter
    fits: Universal M-25 XPB, M-35B, M3-20, M-12, M-18, M-25, M-25XP, M-35, M3-20B, M4-30, M2-12, M-
    $18.20
    Buy onAmazon ↗
Belts (1)
Anodes (1)
  • Zinc 3/8NPT x 1 ?
    fits: Universal M3-20, M3-20B, M4-30, M-25, M-25XP, M-35, M-40
    $25.40
    SearchAmazon →
Electrical (1)
  • Glowplug
    fits: Universal M3-20, M4-30, M-12, M-18, M-20, M-25, M-25XP, M-30, M-35, M2-12
    $73.40
    eBay· $17.97 ↗
Service Kits (2)

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

Related Models

Successor
Universal M-25XP
23 HP · 1997–2010

Sailboats with Universal M-25(10)

CATALINA 28
CATALINA 28
Catalina Yachts (USA) · 28.5ft · 1991
CATALINA 30
CATALINA 30
Catalina Yachts (USA) · 29.92ft · 1976–2008
CATALINA 30 MKII
CATALINA 30 MKII
Catalina Yachts (USA) · 29.92ft · 1986–1991
CATALINA 310
CATALINA 310
Catalina Yachts (USA) · 31ft · 1999–2011
CATALINA 34
CATALINA 34
Catalina Yachts (USA) · 34.5ft · 1985
CATALINA 36
CATALINA 36
Catalina Yachts (USA) · 36.33ft · 1982
CATALINA 38
Catalina Yachts (USA) · 38.08ft · 1978–1990
O'DAY 34
O'DAY 34
O'Day Corp. (USA) · 34ft · 1980–1984
O'DAY 35
O'DAY 35
O'Day Corp (USA) · 35ft · 1984–1989
PEARSON 30
PEARSON 30
Pearson Yachts (USA) · 29.79ft · 1971–1981