Hi! I am new in this forum, and i have read many useful threads. But now i have an issue and might need some help.
I got sunseeker mohawk with twin volvo penta aqad41a engines with 290dp sterndrives. After winter, engines started like a dream. I made maintenance (motor oil, oil filter, racor filter, fuel filter, sterndrive oils etc) and put boat on water. When i drive with lo rpm everything works well, but when i drive with full throttle, both engines starts to overheat. I changed impellers, and checked that water rises nicely in sea water filter but still both engines overheats when driving on plane. I also took thermostats off and tried to boil them and they opened like they should.
I found old thread (https://forums.iboats.com/threads/volvo-penta-diesel-overheating-problem.366960/) but pics and links in that thread doesnt work anymore.
Any help or ideas where to look for air leaks or maybe some other issue?
Sorry for my bad english
And greetings from Finland
I got sunseeker mohawk with twin volvo penta aqad41a engines with 290dp sterndrives. After winter, engines started like a dream. I made maintenance (motor oil, oil filter, racor filter, fuel filter, sterndrive oils etc) and put boat on water. When i drive with lo rpm everything works well, but when i drive with full throttle, both engines starts to overheat. I changed impellers, and checked that water rises nicely in sea water filter but still both engines overheats when driving on plane. I also took thermostats off and tried to boil them and they opened like they should.
I found old thread (https://forums.iboats.com/threads/volvo-penta-diesel-overheating-problem.366960/) but pics and links in that thread doesnt work anymore.
Any help or ideas where to look for air leaks or maybe some other issue?
Sorry for my bad english
And greetings from Finland