Oil in closed cooled system

F

foldman

Recruit
Joined
Oct 6, 2007
Messages
2
i have a 1988 mercruiser 3.7L with a closed cooled or freshwater cooled system, and i have oil in the cooling resevoir. I drained and flushed the entire system then I filled with fresh coolant and noticed i had a few ounces of oil in the coolant resevoir. The oil seems to be fine. Any ideas on what the problem could be?
 
Haut Medoc

Haut Medoc

Supreme Mariner
Joined
Jun 29, 2004
Messages
10,645
Re: Oil in closed cooled system

Welcome to iboats......:)
I'm not real familiar with the 470, but.....
Pretty sure that the water pump is driven by the cam on those models & can go bad......
You might try draining & pressure testing the closed side of cooling system......
Again, I'm sure there are some members here that are far more familiar with the 470......;)​
 
F

foldman

Recruit
Joined
Oct 6, 2007
Messages
2
Re: Oil in closed cooled system

I have been told over the phone that this problem after the oil leaking into the cooling tank could be caused by a blown head gasket. The leak is not to severe so i was wondering if anyone had any ideas about adding a stop leak to the oil or a radiator stop leak to the cooling system or possibly both. Any ideas or advice would be superb
 
Haut Medoc

Haut Medoc

Supreme Mariner
Joined
Jun 29, 2004
Messages
10,645
Re: Oil in closed cooled system

foldman said:
I have been told over the phone that this problem after the oil leaking into the cooling tank could be caused by a blown head gasket. The leak is not to severe so i was wondering if anyone had any ideas about adding a stop leak to the oil or a radiator stop leak to the cooling system or possibly both. Any ideas or advice would be superb
Click to expand...

No & no.......
You really need to pressure test your cooling system to find the leak......;)
 
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