Volvo penta AQ140 overheating

[jbs]

"When the engine is operating

"When the engine is operating at ±1000rpm, the temperature is perfect all the time.
When the engine is at 2000rpm or more the temperature rise and overheating.
Please help me."

 

[el_pescador]

"First, make sure that the hos

"First, make sure that the hose connector in the outdrive is not corroded, as it is the most likely source of air ingress in the raw water system.

Also, verify that the raw water strainer is not clogged, that the raw pump impeller is not damaged, and that the exhaust manifold is not clogged with rust/mud. For the latter, remove the copper pipe going into the exhaust manifold from the oil gooler and stick a screwdriver (if it comes out muddy, you know the manifold is clogged); also, remove the hose betweent he exhaust manifold ad the exhaust pipe (just slide it down to the exhaust pipe) and have a look at the water passages in the exhaust manifold: if they are clogged/corroded, consider replacing the manifold instead of boiling it in a radiator shop unless the manifold is say less than 5 years old. You can also run water with a garden hose through the exhaust manifold water inlet passage and see what comes out through the water passages on the riser side of the manifold."

 

[jbs]

"Thank you El Pescador, i will

"Thank you El Pescador, i will check it this weekend or next week.
Problem is that my boat is into the water.

Greetings from Belgium!"