Mike Roth

I just purchased a 1985 928S, the seller told me that it had a blown head gasket and there was water in the oil. (JUST A GUESS I THINK) It had been sitting for about 4 months. After doing a compression check, every cylinder check out to be 120 psi, to me that tells me the head gaskets are ok. I drained the engine oil and there was no water. After some new spark plugs I got the engine running. I checked the coolant level and found oil in the coolant, lots of it as the engine ran. I had the radiator checked and the radiator is bad, but the oil coolers were just fine, the oil wasn't getting into the coolant thru the oil coolers. Does this sound like a cracked head or engine block? Is there somewere else oil can get into the coolant? I noticed that the water pump and the oil pump are very close to each other, maybe there is a crack in that area. Hope you guys can help. Mike

morganabowen

I had the same problem a couple of months ago. It turned out that I had a leak in the lines inside the radiator that cooled the transmission fluid. I purchased a rebuilt one from 928 Intl. No problems since. I'm no mechanic, so someone else might be able to give you more technical advice. Good Luck

Normy

Mike...try this: Rev the engine hard with the reservoir cap off. See if an exhaust smell and bubbles show up in the reservoir. My old Fiat Spyder had a blown gasket and this is what it did...

Normy!
'85 S2 5 Speed

Dozman

Mike,

Did you figure out your problem with oil coolant mixing?

John D.

Mike Roth

John,

I haven't found the problem yet. I hope to get the engine pulled this holiday weeekend. I'm pretty sure that there's a crack in a head or the engine block causing the problem. I don't think it's a head gasket, the compression was too high.

Mike

Steve Cattaneo

Did the radiator shop pressurize the trans and engine coolers in the radiator? They are the most coming cause of oil in the coolant. Diagnose the cause first; two good diagnostic tools are a cooling pressure tester and fluid tester.


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WallyP

I agree with Steve - check the coolers very carefully. It is possible, but very unlikely, that you have a leak from a pressurized oil passage into the cooling system. It is much more likely that you have a leak from a pressurized cooler into the cooling system.

Also don't forget that if you have an automatic, a leak could be pumping coolant into your transmission and destroying it. My first check would be transmission fluid level and quality.

Mike Roth

I was able to get a bore scope from the local Toyota mechanic. I did find some of the carmel stuff in the drivers side head. I was kinda supprised cause the compression checked good on all cylinders. I did remember the plugs being fould on that head. I did try checking the oil and trans coolers on the radiator again, they checked out ok, but the radiator had some leaks. I got the engine out yesterday, so I should know today, what really happened. Maybe it will just be a head gasket.

Mike Roth

WOW, WHAT A MESS!!! Now I think I like air cooled engines better. I tooked the heads off today, it was hard to find were the head leaked to the water area. Both heads air flat within .005. Not sure if this would be enough to cause a oil in the water leak. Just wandering if there is a way to check for cracks in the heads and the block.

Steve Cattaneo

The only way now is magnuflux, any good engine machine shop can do it. $$$$$$$$$$$$$ <img src="graemlins/beerchug.gif" border="0" alt="[cheers]" />