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V Belt M-18, M-25XP,
M-35 Universal Diesels

Part #: Z2581
Engine Applications (only when equipped with the standard 51 amp alternator):
• M-18
• Early M-25XP when equipped with improved after market Alternator Bracket Retrofit #Z2738
• Late M-25XP with improved (now standard equipment) alternator Bracket
• All M-35 (not M-35B) engines
Boat applications that we are aware of (there could be other combinations as well):
• M-18 (Catalina 27, Catalina 30)
• M-25XP (Catalina 28, Catalina 30, Catalina 34, Catalina 36)
• M-35 (Catalina 34, Catalina 36, Catalina 38)

For other engines, contact tech support at 916/843-1971 with your belt number, boat model, year, engine model, and pump model. We'll special order the belt for you without any special order charges or factory freight. I will also compile the information to assist fellow Catalina sailors in the future.
This belt will only fit if you have the factory original 51 amp alternator (and in the case of the M-25 and early M-25XP the updated Westerbeke Alternator Bracket Retrofit. See "May we also suggest" below for more information on the bracket retrofit). If the alternator has been upgraded to a higher output alternator this belt will not fit.

Technical Support

Sevice Intervals; Engine Maintenance and Spares
Items every inboard auxiliary boat should have aboard
The Unknown Filter
You're not the only one whose never heard of it!