I'm going nuts. I have a Beneteau Oceanis
390 with a Volvo Penta
2003T 3 banger diesel
with serious overheating
issues. I can't run her more than 20 minutes before she overheats.
I'm on my 3rd mechanic
, not counting myself.
The heat exchanger
and the oil
cooler have both been overhauled. The water
pump has been rebuilt and the raw water
flows great. Every hose has been replaced. This includes the intake hoses to make sure they have the wire coils to keep them from collapsing given the suction.
Today I took off the circulation pump (fresh water) hoping it was the problem. The impeller looked brand new. My mechanic
has a great reputation in the area, he has put in at least one work's solid work (if not more) on the engine
...and he's frustrated. He brought in a second mechanic who did some needed things, but then we still overheated on a trial run.
So I figure the only thing we haven't replaced was the circulation pump. That was today's project
. I'll put in my rebuild
because I bought them, but the pump rotor (as noted) was perfect.
I have NO IDEA what to do next. I've hired good mechanics, we've replaced or repaired everything. The engine
runs great at dock
. I can run it for an hour and I hit about 175 on the engine and 200 on the sending unit (using a IR thermometer). But when we take her out, we overheat. I've had a diver check out the intake...twice. It's fine.
Obviously I'm missing something. I'm hoping someone will read this and say "oh, I had this happen to me...do THIS..."
This is my second Volvo Penta
. My first one had overheating
issues too, but I sent my heat exchanger
to a radiator shop for cleaning
and that took care of the problem. This heat exchanger has already been to the shop during this effort.
Any thoughts would be welcome. The engine runs smooth, the raw water
flow seems to be solid. My IR temps on the heat exchanger and oil
cooler show that they are cool the whole time, 100°. No smoke (white or black) from the exhaust
. Oil looks good, no indication of water.