Diesel Engine
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).
Cooling
Exhaust pipe replacement
Heat exchanger maintenance, including zinc change
Heat exchanger upgrade to 3" version to prevent overheating
Hump hose replacement guidance
Overheating as a result of an air lock
Raw water pump: Loss of self-priming capability
Water heater doesn't heat when motoring
Water-lift muffler: Repair or replace?
Electrical
Alternator mount/bracket upgrade Important safety upgrade for M25 (not XP) owners
Engine harness upgrade: A comprehensive overview by Gerry Douglas Important WARNING for M25 owners
Engine harness upgrade by Capt. Al
Glow plug solenoid Installation for faster starting
Secondary start switch
Slow start fix with a wiring upgrade, starter re-build, and new starting battery by Mike Vaccaro
Mechanical
Adjusting Valves
All about alternator belt tension & pulleys
Air Filters
Blow by
Engine Mounts
Injectors
Oil, Filters and Changing oil
Rebuilding a M25xp
Transmission
Misc Projects
Engine Cover Hinge
Outboard Motor Mount
Shaft & Propeller
Flexible Coupling
Shaft Alignment
Stuffing box
Propeller
