In article , Larry
wrote:

Jeff wrote in :

I had chronic overheating problems with a Yanmar 2GM20FC. Everyone
I talked to said it was the the exhaust elbows or the props or high
output alternator. Finally I stripped down the head exchanger and
found some eel grass had reduced flow 50%. Works great now.

I don't understand them when they tell people this. An overloaded
diesel produces huge clouds of BLACK SMOKE, not overheating. As it
bogs, it creates overinjection in naturally aspirated diesels.
Smoking like hell, it doesn't overheat.

Larry, yours was a non-sequitur and incorrect to boot. Yes, a 2GM will
smoke when overloaded, but if run at 3600 for an hour, it will overheat
as designed and advertised. You can run it at 3200 all day though.

Reduced cooling flow of course will overheat any engine. Got an acorn or
similar stuck in our intake once. Engine overheated 5 minutes away from
the dock.

--
Jere Lull
Xan-a-Deux ('73 Tanzer 28 #4 out of Tolchester, MD)
Xan's Pages: http://members.dca.net/jerelull/X-Main.html
Our BVI FAQs (290+ pics) http://homepage.mac.com/jerelull/BVI/