Universal · Inboard diesel

Universal M-25, M-25XP & M-25XPB

The Universal M-25 is a compact three-cylinder, fresh-water-cooled marine diesel built on Kubota engines: Universal’s own parts list names the Kubota D-850 block for the M-25 (1981–1986) and the D-950 for the M-25XP, which replaced it in 1986 with a larger bore, while no Westerbeke document confirms the base of the later one-litre M-25XPB (the often-quoted D1005 is unconfirmed). It became the standard auxiliary of the Catalina 30, 34 and 36. Westerbeke, which owns the Universal line, continued the engine as the M-25XPA and then as the 26 hp M-25XPB of the B-series, which it still lists; no start year for the M-25XPB is published, though Westerbeke’s parts notes already separate engines built before March 1998, and a trailing C (M-25XPC, M-25XPBC) marks the Catalina-spec versions. The two-cylinder M-18 and M2-12 and the four-cylinder M-35/M-35B share many service parts with this family but are not covered here.

Manuals & documents

The links go straight to Westerbeke, which owns the Universal line and keeps its manuals, parts lists and bulletins online. We host no manuals or drawings.

Wear parts & part numbers

PartOEM numberAlso fitsNote
Engine oil filter3002091,2,3,4,5,6—All versions: M-25, M-25XP, M-25XPA and M-25XPB (also M-18, M3-20 and M-35/M-35B). Full-flow spin-on filter on the block.
Fuel filter (engine)2988541,2,3,7,4,8,9—All versions. Spin-on element on the engine-mounted filter head (complete assembly 298853); bleed screw on top of the filter.
Impeller kit (with gasket)2001757,4,3,2,10,11,12—Late Sherwood/Westerbeke pump with three-screw housing: M-25 and M-25XP with pump 302648, M-25XPA, and M-25XPB (pump 042175); also fitted to older engines as an upgrade. Contains impeller 302875, housing O-ring 302877 and end-plate gasket 302879. Impeller about 2-7/16 in OD, 7/8 in wide, 5/8 in bore.
Raw water pump impeller2956281,2,13,14,15,16,17—Oberdorfer pump 301357 (four-screw cover) on the M-25 and M-25XP; cover gasket 295626. As a kit: 200209; pumps with the later stamped cover seal with O-ring 201080, which parts bulletin 2009-3 added to that kit. Impeller about 2 in OD, 7/8 in wide, 1/2 in bore.
Raw water pump impeller2874391,2,18—Early Sherwood pump 300986 (six-screw round cover) on the M-25 and M-25XP; cover gasket 295745. Impeller about 2-1/4 in OD, 25/32 in wide, 1/2 in bore, 12 blades. Westerbeke’s online parts pages no longer return this number (October 2026); Catalina Direct still sells it.
Pump cover gasket3028792,3,19,20—End-plate gasket of the late Sherwood/Westerbeke pump (302648 on M-25/M-25XP, 042175 on M-25XPB); the housing O-ring is 302877. Both come in impeller kit 200175. Oberdorfer pump: gasket 295626; early Sherwood pump: 295745.
Raw water pump0578662,3,21,22,23,24,25replaces 302648replaces 042175—Current replacement for the late Sherwood-type pumps 302648 (M-25/M-25XP) and 042175 (M-25XPB). Rebuild kit 200176. To fit this pump on an engine with the old Sherwood or Oberdorfer pump: conversion kit 302837 (with pump) or 302838 (without pump). Oberdorfer pump 301357 is no longer available; its repair kit 200212 still is.
Fuel pre-filter3001282,7,26,27—M-25 and M-25XP with electric lift pump 301385: small filter with gasket inside the pump.
Fuel pre-filter04807628,4,29,30—80-micron filter screwed into the 1/8 in NPT inlet of the electric lift pump: M-25XPB and all Westerbeke/Universal engines built from March 2003 (date code E303).
Fuel lift pump301385 · 0392752,3,29,31,32—301385 for the M-25 and M-25XP (12 V); 039275 for the M-25XPB (12 V diesel lift pump, also in Westerbeke’s kit B for the M-25XPB).
Air filter3010492,3,33,34—M-25, M-25XP and M-25XPB: foam element for intake silencer 302181 (aluminium honeycomb housing with foam cover).
Thermostat3013582,3,35,36,26,37—160 °F, 38 mm: M-25, M-25XP and M-25XPA; M-25XPB only if built before March 1998. Also sold as thermostat kit 200217. Gasket 300237.
Thermostat2010013,29,38—160 °F, larger type: M-25XPB (and M-35B/M-40B) built from March 1998, with the larger thermostat housing 200502. Westerbeke’s product page gives 42 mm, the parts list 44 mm outside diameter. Gasket 298843.
Thermostat gasket300237 · 2988432,3,39,40—300237 for thermostat 301358 (M-25, M-25XP, M-25XPA, and M-25XPB built before March 1998); 298843 for the later M-25XPB thermostat 201001.
Anode (engine)3010682,7,41,42—Heat exchanger zinc, 3/8 in NPT: M-25 and M-25XP with the 3 in diameter heat exchanger (standard on later engines). Westerbeke’s kit A for the M-25XP contains two.
Anode (engine)3010692,43,42—Heat exchanger zinc, 1/8 in NPT: early M-25 and M-25XP (and the 5421) with the original 2 in diameter heat exchanger 299049.
Anode (engine)0118853,4,44,42—Heat exchanger zinc, 1/4 in NPT: M-25XPB with heat exchanger 201027. Westerbeke’s kits A and B for the M-25XPB contain two.
Heat exchanger gasket2002167,4,3,45,46,47—2-3/4 in gasket in Westerbeke’s current spares kits for the M-25XP and M-25XPB (the M-25XPB parts list shows 022851 with O-ring 019321). Early M-25 with the 2 in exchanger: cap and gasket 299838; with the 3 in exchanger: cap and gasket 301457.
Alternator V-belt300805 · 300817 · 3021902,7,26,48,49,50,51—300805 is the original belt for the M-25 and M-25XP (41.6 in) and the one in Westerbeke’s M-25XP spares kits. The parts list also gives 300817 for an M-25XP with the later alternator bracket and 302190 for an M-25 fitted with the alternator conversion kit, so check the bracket before ordering.
Alternator V-belt0304753,4,52—M-25XPB with the standard 51 A alternator (39.5 in belt).
Glow plug3017542,26,53,54—M-25XP: 301754 (Westerbeke’s kit B and the M-25XP fast-moving parts sheet). The M-25 sheet and the nozzle-holder page of the parts list give 299685 instead. Three per engine.
Glow plug2005953,55,29,56—M-25XPB, 12 V sheathed type, three per engine; tightening torque 7–11 ft-lb.
Fuel injector298787 · 2987882,26,57,58,59—M-25 and M-25XP: one 298787 (No. 1) and two 298788 (No. 2) per engine; nozzle tip 301514. Westerbeke’s M-25XP kit B carries one 298787. The operator’s manual spec pages give nozzle numbers 299517 and 299518.
Fuel injector201125 · 2007013,29,60,61—M-25XPB, three per engine: 201125 from date code E501 (January 2005), 200701 up to E412 (December 2004). Sealing gasket 301303; nozzle tip 201124 on the later injectors.
Cylinder head gasket302184 · 30014162,2,63,64,65,66—302184 for the M-25XP, with shim 302185; 300141 for the M-25, with shim 300142. Fit the shim if one was fitted before, or if you cannot tell (Westerbeke service bulletin 272).
Gasket set256930 · 2568082,26,67,68,69,70—Complete sets: 256930 for the M-25XP, 256808 for the M-25. Upper (top-end) sets: 256921 for the M-25XP, 256836 for the M-25.
Gasket set2010293,29,71,72—M-25XPB complete set; upper (top-end) set 201030.
Exhaust flange2985992,73,74,75—Rectangular three-hole flange on the M-25/M-25XP exhaust manifold, with a 1-1/4 in NPT female thread for the boat’s exhaust riser; gasket 298600. Not for B-series engines.
Exhaust mixing elbow200488 · 2004863,76,77,78,79—M-25XPB: 90° kit 200488 or 45° kit 200486; V-clamp 036541 (2.5 in) and elbow gasket 036425. Universal’s parts sheets list no water-injected elbow for the M-25/M-25XP (‘N/A’): the exhaust riser came from the boat builder.
Engine mount0405103,80,81—Flexible isolator for 75–130 lb: front mounts of the M-25XPB (two per the parts list) and one of the styles listed for the M-25XPA. The original M-25/M-25XP mount 300514 no longer appears in Westerbeke’s parts search, so compare the mount style with the parts list before ordering.
Alternator0428472,3,82,83replaces 302280—For identification only: the original 51 A alternator 302280 of the M-25/M-25XP now points to retrofit kit 042847, and Westerbeke lists both as no longer available. The M-25XPB used 041017, also no longer available (optional 72 A: 300746). Look for a used, rebuilt or aftermarket unit.
Spares kit256912 · 2568027,26,2—M-25 / M-25XP. Kit A 256912: oil filter 300209, fuel filters 298854 and 300128, impeller kit 200175, exchanger gasket 200216, O-ring 019321, belt 300805, two zincs 301068. Kit B 256802 adds the water-pump rebuild kit, thermostat kit, complete gasket set, an injector and a glow plug.
Spares kit200522 · 2010384,29,3—M-25XPB. Kit A 200522: oil filter 300209, fuel filters 298854 and 048076, impeller kit 200175, exchanger gasket 200216, O-ring 019321, belt 030475, two zincs 011885, hardware kit 201016. Extended-cruise kit B 201038 adds the lift pump, water-pump rebuild kit, glow plug, injector, thermostat and complete gasket set.

Numbers checked against the sources below on 13 October 2026. Always confirm against your serial number and exact type before ordering.

Service intervals

TaskInterval
Engine oil changeM-25 / M-25XP (older manual): first change after 25 h, then every 75 h or once a season · M-25XPB (B-series manual): first change at 50 h, then every 200 h or yearly1,55
Oil filterWith every oil change, in both manuals1,55
Fuel filterM-25 / M-25XP (older manual): every 100 h or yearly · M-25XPB (B-series manual): after the first 50 h, then every 250 h or yearly, with new sealing O-rings1,55
Fuel pre-filterLift-pump inlet filter 048076 (M-25XPB; engines from March 2003): after the first 50 h, then every 250 h or yearly28,55
Gearbox oil changeATF: check the level weekly; change after the first 25 h, then every 300 h or at least once a season1,55
Raw water impellerB-series manual: every 500 h or yearly, remove the cover and inspect cam, wear plate and impeller; replace worn parts. Always carry a spare impeller kit55,1
AnodeB-series manual: inspect every 50 h or monthly and replace when worn; set your own interval from what you find55
V-belt checkCheck the tension monthly, and every 50 h (B-series manual) or 100 h (older manual): about 3/8 to 1/2 in deflection1,55
Air filterB-series manual: inspect every 100 h or yearly; clean or replace the element as needed55
Coolant changeB-series manual: drain, flush and refill every 500 h or yearly55
Valve clearanceB-series manual: adjust every 500 h (a job for a mechanic)55
InjectorsB-series manual: check opening pressure and spray pattern every 500 h; pressure-test or rebuild at 1500 h55
Glow plugsB-series manual: remove, clean and refit with anti-seize every 500 h55
Heat exchanger cleanB-series manual: remove for professional cleaning and a pressure test every 1000 h or 5 years55

Hours or time, whichever comes first. Two schedules: Universal’s operator’s manual 200157 for the M-25 and M-25XP (the older manual) and the B-series operator’s manual 200550 for the M-25XPB. Rows marked “B-series manual” come only from the newer book; for an M-25 or M-25XP, check the older manual.

Specifications

Years builtM-25: 1981–1986 (predecessor 5421 with the same 52 cu in block: 1978–1981) · M-25XP: from 1986, later as M-25XPA · M-25XPB: start year not published, still listed by Westerbeke2,1,84,85
Versions5421 and M-25: Kubota D-850 block · M-25XP and M-25XPA: Kubota D-950 block (both from Universal’s engine data table) · M-25XPB: B-series, 1.0 l, base block not named by Westerbeke · suffix C (M-25XPC, M-25XPBC) = Catalina specification2,84,86
Cylinders3 in line, four-stroke, naturally aspirated87
InjectionIndirect injection (spherical swirl chamber)87
CoolingFresh-water cooled with heat exchanger87
DisplacementM-25: 52.2 cu in (about 0.86 l) · M-25XP / M-25XPA: 57 cu in (about 0.93 l) · M-25XPB: 61.2 cu in (1.0 l)88,89,84,87
Bore × strokeM-25: 2.84 × 2.76 in · M-25XP / M-25XPA: 2.95 × 2.76 in · M-25XPB: 2.99 × 2.90 in (76 × 73.6 mm)88,89,84,87
PowerM-25: 21 hp at 3200 rpm continuous (25 hp maximum in the sales sheet) · M-25XP / M-25XPA: 23 hp (17.1 kW) at 3200 rpm · M-25XPB: 26 hp (19.0 kW) at 3000 rpm90,91,92,93,87
Maximum torqueM-25: 40 ft-lb at 1850 rpm · M-25XP: 43.8 ft-lb at 1850 rpm · M-25XPB: 47 ft-lb (6.5 kg-m) at 2440 rpm94,87
Idle speed1000–1200 rpm (M-25XP and M-25XPB)95,96
Full-throttle rangeM-25XP: 3100–3200 rpm (cruise 2100–2600 rpm) · M-25XPB: 2900–3000 rpm (cruise 2000–2500 rpm); the propeller should let the engine reach this at full throttle95,96,93
Compression ratio21:1 (M-25, M-25XP) · 23:1 (M-25XPB)97,87
Compression pressureM-25 / M-25XP: 3.00 MPa (427 psi) · M-25XPB: 412–469 psi at 250 rpm cranking speed97,55
Injection timingM-25 / M-25XP: 23–25° BTDC · M-25XPB: 18–20° BTDC97,55
Injection pressure13.7–14.7 MPa (1990–2133 psi), Bosch-type throttle nozzles97,87
Valve clearance (cold)0.145–0.185 mm (0.006–0.007 in), intake and exhaust, all versions97,55
Engine oil capacityM-25: about 4.0 US qt · M-25XP: 4.0–4.3 US qt · M-25XPB: 4.0 US qt (3.8 l) per the technical manual and spec sheet, but 3.5 US qt (3.3 l) in the 2015 operator’s manual; always fill to the dipstick mark1,87,93,55
Engine oil gradeOlder M-25 / M-25XP manual: SAE 30 heavy-duty (API CD) or 10W-40 · B-series manual: API CF, CG-4, CH-4 or CI-4, SAE 15W-401,55
Coolant capacityM-25 / M-25XP: about 5 US qt of 50/50 antifreeze mix · M-25XPB: 4.0 US qt (3.8 l)1,87
Thermostat opens at160 °F (71 °C), all versions; M-25XPB normal operating temperature 170–190 °F (77–88 °C)2,38,87
GearboxHurth mechanical reverse gear, 2:1 as standard on M-25 / M-25XP (V-drive also listed) · M-25XPB: Hurth HBW-50, 2.05:1, ATF Type A / Dexron II or III, 0.37 US qt (0.35 l)1,2,87
Alternator12 V, 51 A, belt-driven (M-25 sales sheet: 55 A); 72 A optional on the M-25XPB90,91,3,87
Fuel consumptionM-25XPB: about 1.0 US gal/h (3.8 l/h) at 2500 rpm87
Flow rateRaw-water pump, M-25XPB: 7.0 US gal/min (26.5 l/min) at 3000 rpm87
WeightM-25 / M-25XP: 285 lb (129 kg) · M-25XPB: 295 lb (134 kg) with transmission88,89,87
MountingMounting centres 11.5 in and 16.0 in (11.5 in as on the Atomic 4)94,90,93
Exhaust outletM-25 / M-25XP: flange with 1-1/4 in NPT female thread · M-25XPB: water-injected elbow on a 2.5 in V-clamp1,93,75

Good to know

  • Count the screws on the raw-water pump cover before you order an impeller: three screws on a removable housing mean the late Sherwood/Westerbeke pump (kit 200175), four screws on a square plate the Oberdorfer (295628), six screws on a round plate the early Sherwood (287439). On older boats the pump may have been swapped.98
  • The heat exchanger zinc sits on the drain plug at the bottom of the exchanger, and the plug’s wrench size tells you which zinc you need: 7/16 in = 1/8 in NPT (301069), 9/16 in = 1/4 in NPT (011885, M-25XPB), 11/16 in = 3/8 in NPT (301068).42
  • When you replace the head gasket on an M-25 or M-25XP, note whether a thin shim was fitted under it; Westerbeke advises fitting gasket and shim if you are not sure.62
  • Early M-25 and M-25XP engines with the 2 in heat exchanger can run hot at high rpm. First check the intake hose, the impeller, scale in the exchanger and a clogged exhaust elbow; the fix Westerbeke describes is the 3 in exchanger of later engines.99
  • On an M-25XPB built up to January 2000 (date code E001 or earlier), check that the camshaft end driving the raw-water pump has its reinforcing sleeve (kit 48245); without it the drive tang can break. The date code ends the serial number: decade letter, year digit, two-digit month (E412 = December 2004).100,101
  • Keep the idle at 1000–1200 rpm and check the panel tachometer against a handheld one: too low an idle shakes the engine and has cracked the fuel filter bracket on M-25XPB engines and the front mounting brackets on Catalina-spec M-25XP(C) engines.102,86

Fitted in

Boats whose builder lists it as standard or optional equipment:

  • Catalina 36 — Universal Model 25 (M-25 · M-25XP) (Price list of 1 December 1990: standard engine is the Universal Model 25, three cylinders, 23 hp, fresh-water cooled, with panel and tachometer; the 1984 and 1986 brochures name no engine)

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Sources

  1. westerbeke.com/operator%27s%20manual/200157_m12-m50_operator_man.pdf
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  100. westerbeke.com/service%20bulletin/service%20bulletin%20235%20universal%20cam%20sleeve%20u…
  101. westerbeke.com/userfiles/Serial%20Number%20Identification%20Guide%20Web%20May%202012.pdf
  102. westerbeke.com/service%20bulletin/service%20bulletin%20247%20universal%20fuel%20filter%20…

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