I'm curious if someone has had this problem and found a good solution:
Heat exchanger makes contact with the elbow for the exhaust riser (which is covered in a woven heat shield) and also touches a rubber hose. Both of those items show signs of melt (very very slight) from the heat of the heat exchanger. Is it wise to buy a thermo-heat-blanket and wrap the riser pipe as well as the rubber hose to protect them from the heat exchanger, or to wrap the heat exchanger instead in order to protect everything around it?
I have a 1985 Catalina 30, it has the Universal M25. For people unfamiliar, it is the largest engine they could fit in the compartment under the galley/dinette area. Adding the new-and-improved larger heat exchanger took up even more room and brought things a little too close together.
A little while ago I threw out the old heat exchanger (30 years old) and replaced it with the 'upgraded' better heat exchanger which is also about a 1.5" larger in circumference. Sort of muscled in the brackets and the hoses to get it all to fit and it's been working great. The only problem is that it is squeezed in, and was making contact with the exhaust riser pipe (the elbow bend coming out of the manifold) that pipe is wrapped in the fiberglass woven heat shield and herein lies the problem. The heat exchanger has caused the cloth-woven exhaust-riser pipe shield to melt a little bit (looks like a cloth spider web between the two pieces now). Realizing this, I also noticed that a rubber hose which also touches the heat exchanger on another side shows a little bit of melt on it as well.
I'm thinking about buying something like http://www.amazon.com/Thermo-Tec-13575-Adhesive-Backed-Barrier/dp/B00029KC2K/ref=sr_1_1?ie=UTF8&qid=1450910774&sr=8-1&keywords=exhaust+heat+shield+blanket but cannot decide whether wrapping the heat exchanger is better, or just individually wrapping the exhaust riser pipe and soon-to-be-replaced rubber hose with the shield is better. Maybe if I wrap the riser pipe and rubber hose with the shield-blanket inside-out?! That way I can still have easy access to the heat exhanger while protecting the separate pieces.
Photos of the install can be found here at the bottom of the page: Philip Skinner
Any other suggestions are welcome, too. Except for moving the heat exchanger. I don't think it would fit anywhere else.
Thanks & Happy Holidays