Blown head gasket.
11-20-2010, 02:30 AM
#1
Track Day
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Blown head gasket.
Well it seems I now have a blown head gasket. These past couple months I have had a mysterious coolant "leak",with no source. It wasn't to rapid of a loss until recently I was doing gallons a week, at this point it was trying to run hot (when it's 30 degrees out) so I parked it. Though I never had the white smoke from the tail pipe. I also noticed a white sludgy build up around the top of the tube you pour oil in so my conclusion is head gasket. (The car has 200,000 miles on it to). So I'm going to replace that and while I'm at it do some other maintenance. I figured I would ask what would be some recommended things to replace while it's apart ? Thanks
11-20-2010, 03:25 AM
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When my HG blew, I replaced it with a cometic HG; I also did the water pump and front seals while it was apart, plus had a basic head job done. The 951 had about 115K on it when it went and had been running chips since '91 or so.
A year or so before the HG went, I replaced the rod bearings, oil pan gasket, fuel lines, FPR, motor mounts, front and rear suspension, and almost every gasket, bolt and nut that was touched during the process.
A year or so before the HG went, I replaced the rod bearings, oil pan gasket, fuel lines, FPR, motor mounts, front and rear suspension, and almost every gasket, bolt and nut that was touched during the process.
11-20-2010, 09:51 AM
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Proprietoristicly Refined
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11-20-2010, 10:26 AM
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Sure sounds like an HG. I wouldn't keep running it this way since antifreeze boiling in the combustion chamber in sufficient quantity can steam clean the cylinder walls with nasty results (learned the hard way).
11-20-2010, 02:26 PM
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11-20-2010, 05:33 PM
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So now I'm beginning to think it's not a head gasket, I did a coolant system pressure test and everything was normal, no rapid gains in pressure,just gradual. I'm thinking it has to be the oil cooler
11-20-2010, 06:09 PM
#7
Three Wheelin'
White smoke is coolant. I would purchase a wild fire kit from Pelican and get'ir done.
Good luck,
PS make sure the kit you purchase is correct, i received a few parts form my kit that were packaged wrong.
Good luck,
PS make sure the kit you purchase is correct, i received a few parts form my kit that were packaged wrong.
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11-20-2010, 08:17 PM
#8
Proprietoristicly Refined
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If you hear bubbles in the coolant reservoir tank==bad HG.
If you hear hissing at the exhaust pipe tip===bad valves
If you hear hissing in the oil fill cap tube===bad rings
http://www.dietersmotorsports.com/Co...akdowntest.htm
Harbor frieght puts the leak down tester on sale.
GL
John
11-21-2010, 09:50 AM
#9
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The oil cooler usually fails when the 2 large oil cooler "O" rings age. This allows oil into the cooling system and causes a "milkshake" --brown foam in the cooling reservoir. The oil coats the hoses and internal parts.
If the opposite happens and the coolant enters the oil passages, eventually getting into the oil pan-----it will distroy the rod bearings. Porsche tech WSM (work shop manual) says to replace the rod bearings if this happens.
To change the oil cooler gaskets and "O" rings requires an alignment tool for the OPRV (oil presure relief valve) or it may bind and cause bad problems.
It is not a hard job---just really messy and limited space to work. Some members take off the headers. If you decide to do the HG---the oil cooler gaskets should be changed at this time.
GL
John
