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I do all my own tricks
Join Date: Jul 2011
Location: IL
Posts: 38
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924S water in oil
I just did a head gasket on my 87 924's, started it up and it ran fine(no smoke or misfire), I let the car sit for 2 days and all of my coolant is in the oil pan, What could cause this much coolant to go to the oil pan?
-I had the head machined and pressure checked while it was off -I just pulled the spark plugs and they look good, no signs of coolant -It did not blow smoke when I started it, and it has 4-5 bar of oil pressure at idle -Compression test 1: 165 psi 2: 160 psi 3: 160 psi 4: 155 psi I was thinking the oil cooler broke, or a possible cracked block. What do you guys think? Thanks, Joey
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87 924S 172,000 miles Last edited by 99TJSahara; 06-19-2012 at 06:34 PM.. Reason: added compression test results |
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06-19-2012, 05:09 PM
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ALL the coolant?
It still runs? What is your compression? . You sure the coolant didn't get in there when you took the head off?
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83 944 NA - Black on black 86 951 - Red - SOLD 7/21 16 Ford Expedition He who hesitates is lost. |
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06-19-2012, 05:55 PM
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I do all my own tricks
Join Date: Jul 2011
Location: IL
Posts: 38
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Quote:
I would say 80-90% of the water(the reservoir is empty, and it's more than 1/2 way up the dipstick), and I'm sure it's not from when I removed head as I did an oil change before start-up, and after the the initial start-up I checked the oil and there was no sign of water. As for compression I'm not sure I haven't had a chance to check it, I did shine a light down in the cylinders and didn't see any signs of water.
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87 924S 172,000 miles Last edited by 99TJSahara; 06-19-2012 at 06:46 PM.. |
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06-19-2012, 06:04 PM
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I do all my own tricks
Join Date: Jul 2011
Location: IL
Posts: 38
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Just went out and did a compression test
cyl 1 165 cyl 2 160 cyl 3 160 cyl 4 155 engine has 172k, so the numbers look good to me
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87 924S 172,000 miles |
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06-19-2012, 06:30 PM
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What was it doing before you took the head off?
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83 944 NA - Black on black 86 951 - Red - SOLD 7/21 16 Ford Expedition He who hesitates is lost. |
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06-19-2012, 07:02 PM
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I do all my own tricks
Join Date: Jul 2011
Location: IL
Posts: 38
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Quote:
My guess is the PO overheated the engine because the head gasket was very new and the head surface had scuff marks from someone cleaning the head surface with a buzz-wheel, which tells me they did not have it machined, also the head nuts were way over-torqued The machine shop I brought it to had to remove somewhere between .006-.010 off the head surface to get it flat.
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87 924S 172,000 miles Last edited by 99TJSahara; 06-19-2012 at 07:17 PM.. |
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06-19-2012, 07:14 PM
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Join Date: Nov 2005
Location: Northern VA
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I had a similar experience with my car
You need to check the oil cooler seals they can bow out causing your issues. Normally it is always a good idea to replace them anytime you have the head off Lot easier access! Good Luck
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1997 Porsche Boxster Red 1993 Porsche 968 Red 1988 Porsche 944 Metallic Gray 1987 Porsche 924S Red 1987 Porsche 924S White |
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06-20-2012, 04:40 AM
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Proprietoristicly Refined
Join Date: Jul 2001
Location: ~Carefree Highway~
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Quote:
When you did the head, were the oil cooler seals replaced? John
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1988 924S, 85,750K ..+ 1987 924S, 154K DD (+15K est. bad odo) |
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06-20-2012, 05:27 AM
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Registered
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Location: Northern VA
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It was not included but I decided it should be done so we did.
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1997 Porsche Boxster Red 1993 Porsche 968 Red 1988 Porsche 944 Metallic Gray 1987 Porsche 924S Red 1987 Porsche 924S White |
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06-20-2012, 06:13 AM
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The seals may be new on the oil cooler, but if it was misaligned during installation, it could have bent the spigot.
Here's a picture of how I found mine after removal. 
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06-20-2012, 08:26 AM
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I do all my own tricks
Join Date: Jul 2011
Location: IL
Posts: 38
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The oil cooler seals were not done when I did the head (I should have, but didn't), but could bad oil cooler seals cause this much water to enter the oil? I figured that there would be signs of oil mixing with the water, as the oil is at a much higher pressure than the water would be. So what causes water to enter the oil, but no oil in the cooling system?
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87 924S 172,000 miles Last edited by 99TJSahara; 06-20-2012 at 10:22 AM.. |
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06-20-2012, 10:15 AM
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Yes this could be your cause, I think that it was my main cause
I thought the head gasket was blown as you normally would but after taking the head gasket off I saw nothing wrong with the gasket so I think it was the oil cooler seals the whole time. The coil cooler seals were upgraded to better ones as the original ones had some design flaw that would allow them to eventually leak. I don;t know why it only works in the one direction as far as only coolant in oil and not vice versa but I think it has to do with the way the fluid flow thru the cooler and the design of the seals only allows it to mix one way?
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1997 Porsche Boxster Red 1993 Porsche 968 Red 1988 Porsche 944 Metallic Gray 1987 Porsche 924S Red 1987 Porsche 924S White |
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06-20-2012, 12:22 PM
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Registered User
Join Date: Aug 2011
Location: Mahwah, NJ
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I believe coolant gets in the oil because the cooling system holds pressure long after the car is off while the oil system doesnt.
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06-20-2012, 01:23 PM
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I do all my own tricks
Join Date: Jul 2011
Location: IL
Posts: 38
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Quote:
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87 924S 172,000 miles |
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06-20-2012, 05:22 PM
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My 951
My 83 NA
1986 Porsche 944 NA
