FAQ: Heat exchangerDoes this dreadful thing require maintenance?
Where the heck is it?
The heat exchanger is on the upper back (aft) portion of the engine -it looks like a 4" cylinder approx. 2ft. long lying on it's side thwartship. Look in your owners manual at the picture of an M25/M25XP it will show the exchanger and the zinc . If you don't have one contact your Westerbeke dealer. That owners manual and the parts manual are a MUST to have on board. Ron APACHE #788
What's involved in maintaining it?
I've added this maintenance to my annual spring fitting out list, doing all that is mentioned below. One additional step that I perform is to use radiator flush (the typical automotive type - found just about anywhere) and after the cleaning ritual below, fill the exchanger with the prescribed mixture and let it soak overnight. A couple of vigorous shakes the next day, followed by multiple rinses and reassembly has kept mine troublefree for 5 years now. Several years ago I also cleaned the exterior with a wire brush and got it completely down to bare metal. Then I primed and painted it with an engine enamel (black) (Bob Mack, Upon A Star #52)
NOTE: Be sure to read the FAQ page about heat exchanger zincs!!!!!
Important: The opinions expressed here are those of the individual contributors to this page, and not those of the Catalina 34 National Association or Catalina Yachts, Inc. Additionally, this material has not been reviewed by Catalina Yachts, Inc. for technical accuracy. This page's maintainer cannot guarantee the accuracy of this information or the desirability of suggested modifications or upgrades. Please obtain assistance from a competent marine mechanic or boatyard prior to making any significant modifications to your vessel.