Hi all,
I have a pair of 8-53 and one is overheating in gear at idle, if I increase rpm it immediately cools down to 150.
It is keel cooled aluminum boat,we have flushed coolers and engine several times, replaced thermostats replaced water pump.
recently we replaced cracked head then started having this problem.
Also getting oil in cooling water and air out of bleeders on top of stat housings.
I am wondering if head install might have gone wrong and is introducing combustion gas into coolant and causing air lock at low rpm?
I make my living with this boat and am at my wits end.
This engine has allways run at 150 up to around 1400 rpm and at 2350 cruise speed 175-180. Other engine runs normal temps.
Any thoughts?
Thanks
I have a pair of 8-53 and one is overheating in gear at idle, if I increase rpm it immediately cools down to 150.
It is keel cooled aluminum boat,we have flushed coolers and engine several times, replaced thermostats replaced water pump.
recently we replaced cracked head then started having this problem.
Also getting oil in cooling water and air out of bleeders on top of stat housings.
I am wondering if head install might have gone wrong and is introducing combustion gas into coolant and causing air lock at low rpm?
I make my living with this boat and am at my wits end.
This engine has allways run at 150 up to around 1400 rpm and at 2350 cruise speed 175-180. Other engine runs normal temps.
Any thoughts?
Thanks