Jacob, Like Josh suggested, a good machine shop can probably help. Failing that, I'd take the exchanger to a good radiator shop.
I had corrosion and leakage on the sealing surface of a side plate of the Atomic 4 that was in Touche' when I bought it. Repaired it with JB Weld and a flat file. Sealed up great and didn't leak for years until I repowered it. Is this it? https://www.dam-marine.com/gb/home/32570-yanmar-3hm35-cooling-fresh-water-cooler-75b8dbdd.html BTW, there's a complete 3HM35F on eBay for $5000. -- Dennis C. Touche' 35-1 #83 Mandeville, LA On Wed, Apr 10, 2024 at 7:35 AM jacob fuerst via CnC-List < cnc-list@cnc-list.com> wrote: > Good day, > > In the process of doing some much needed engine upkeep on a 3HM35 and I > found the heat exchanger case has some corrosion around the front seal and > may not reseal or at least not for very long. There is quite a bit of > additional corrosion around the front of the same case. The local yanmar > shop said they looked for a replacement to no avail. Perhaps someone here > knows of a lead? > > That said I’m not entirely opposed to dropping a new engine in because the > heat exchanger isn’t the only issue and I don’t even know the serial number > because the ID plate fell off before I became the owner and who knows the > total hours. > > My understanding is these boats were originally fitted with the 3QM30 but > at some point a 3HM35 with 2 bladed folding prop was installed in mine. My > question is if a 3YM30AE would be a sufficient replacement. The local shop > points out the higher rpm of the 3YM and believes it would be underpowered > compared to the current 3HM and is suggesting a 3JH40. > > I’m interested to hear any thoughts or experiences you might have. Thanks > in advance! > > Jacob Fuerst > 303-520-4669 > 1978 C&C 36 > Ventura, CA >
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