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Thanks for getting back to me with your very comprehensive and well written explanation. I'll definitely check my HE when I return to Florida.
Bill, I also have an Amel about the same age as yours, and it too has the TMD22a. My engine would also run hot if I ran it much over 1800 rpm , at 2500 rpm for a few minutes I was seeing 217 degrees . I replaced the impeller ,insured water supply was unrestricted and cleaned the heat exchanger several times over a couple of years and yet still had overheating. I finally discovered my problem, and probably yours. The rubber caps on either end of the heat exchanger needed to be replaced and while ordering them online , on the side bar it showed a rubber washer/seal . I had no idea what it was for ,but bought it as well. I found a illustration showing this washer around the H/E core , when I took the core out and looked into the H/E housing ,towards the back I saw what I would call a small round bulkhead built into the housing ,slightly larger in diameter than the core itself. The seal closes off the opening forcing the cooling water to flow thru the core rather than much of it bypassing to core . So at low rpms the cooling was adequate to keep temps low ,but couldn't cool the water efficiently enough at higher rpms.
The washer had deteriorated and fallen off the core before I ever first took it apart, thus I never knew it existed ,I found small remnants of it later in the housing. So take your core out and see if the washer is on the core,I will bet it is gone, or pushed back too far and not sealing the opening. When you replace it ,slip it over the far end but not so far that it does not come into contact with the bulkhead opening ,let the bulkhead push it into its proper position as you slide the core into place.
One last tip to save a couple of hundred dollars. Buying the rubber end caps from any Volvo supplier was going to cost about $350. I found that if I ordered the caps for a Perkins M80 ,same caps ,it only cost about $55. ,the seal/washer was only a couple of dollars.
I hope this ends your overheating issues, I think it will.
SM Shenanigans #123
Sassafras River ,Md.
From: Bill Shaproski <bill.shaproski@...
Group Moderators <email@example.com
Sent: Sun, Jul 5, 2020 7:31 pm
Subject: Re: [AmelYachtOwners] Cruise and Max RPM #solution
I have a 1995 Amel SM with a TMD22A and a MaxProp. I used a max cruising speed of 2,000 RPM when doing my circumnavigation, but usually tried to keep it at 1800RPM. I have cruised at 2600 RPM plus in an emergency for about 30 minutes, but the engine did get very hot. Hope this helps. I arrived at the 2,000RPM number by listening to the prior owner's advice.
S/v Pacific Cool
Hello Amelians! I am in the process of learning my boat. The engine is a Volvo TMD22, with autoprop h6 propeller.
I found some threads here on the forum related to this topic, but none conclusive about what is the ideal cruise rpm regime, and what is the maximum rpm? I can't get more than 2100 rpm!
SV Wayag, SM 323
Currently Alicante, Spain