Diesel Engine

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The Catalina 34 has had at least three different motors. The M25, a 21hp engine, was installed on the the early models. The M25XP (23 hp) became standard in 1988. The M30, a 4 cylinder producing 28hp, became an optional engine about the same time and is standard in the Mark II. All are produced under the Universal Motors brand (now Westerbeke Corporation). Due to lack of available supplies, the factory occasionally installed a Yanmar engine (note: Yanmars are higher-compression engines, which do not require glow plugs).

General

CRITICAL UPGRADES includes a lot of engine information: Critical Upgrades http://c34.org/bbs/index.php/topic,5078.0.html

[RESOURCES - good M25 engine information,from a C36 owner http://realitycheck.me/resources.htm]

Cooling

The first part pertains more to C30's with M-25s/Oberdorfer pumps, than to M-25XPs -- but it's interesting background anyway.... 
The second part pertains to us all, and is subtitled "Yes, you're right ...but we don't tell customers that."
--KWKloeber 08:47, 15 May 2015 (PDT)

Electrical

Engine Harness Upgrade from Maine Sail http://www.pbase.com/mainecruising/universal_wiring_harness_upgrade and http://forums.catalina.sailboatowners.com/showthread.php?t=135558

Thermostat Sender Source http://c34.org/bbs/index.php/topic,7985.0.html]]

Exhaust System

Fuel

Mechanical

[NOTE] The filter interchanges at the above OTT website link can't necessarily be trusted; double-check if you use them.
 Notice, for instance, that OTT lists NAPA p/n 3389 for both fuel and lube application. I don't THINK so. I brought this to OTT's attention and suggested they correct the list. OTT asked ME to provide THEM all the correct interchange numbers and they would revise the website.
Again, I don't THINK so. :-) --KWKloeber 21:33, 29 June 2014 (PDT)


Transmission Fluid 101 - link to the message board: http://c34.org/bbs/index.php/topic,6417.0.html


Universal M-25 & M25XP Alternator Bracket Upgrade & Alignment IMPORTANT

http://c34.org/bbs/index.php/topic,7917.0.html

Misc Projects

  • Options to Route Crankcase Breather Hose to Air Intake VIEW THE PDF

Shaft & Propeller

Also of Interest

Westerbeke/Universal now has the owner manuals online. You can download them at http://www.westerbeke.com/Products/OnlineManuals.aspx

Kubota Block Equivalents (you have to scroll down) http://www.ericsonyachts.org/infoexchange/showthread.php?10241-Universal-5432-amp-M40-engine-information&highlight=kubota+block

and

http://c34.org/bbs/index.php/topic,8113.msg56648.html#msg56648

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