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Registered
Join Date: Nov 2001
Location: Western Pa.
Posts: 2
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928 head gaskets
Hi there, I need some help, and I need it soon. I'm looking at a 928 they mechainic said it has blown head gaskets. But he didn't say how he came up with this. Is there a easy way to check this out without takeing the whole motor apart? And does this motor 928 S4, have a history of head gasket failures? Or is it that the motor is now junk? Please e-mail PorscheT70@aol.com if you can help, Thank you
 
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03-18-2003, 06:45 PM
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Registered
Join Date: Aug 2001
Location: Brighton UK since 11/2012
Posts: 3,170
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No, they don't have a history of blowing headgaskets. This could turn in to be a major job so I hope the 928 is cheap.
You could do some diagnosis and find out if the gaskets are blown, of course if they aren't the the shop doesn't know that, someone could have a good deal............................
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From November 2012; Precision Porsche Specialist Sussex UK, +44 (0)1825-721-205 2001-2012 Gerber Motorsport Inc. 206-352-6911 07.15.06 1996 Ducati 900SP. Suprisingly enough, it's red 08.16.09 1999 Kawasaki ZRX1100. Green. |
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03-19-2003, 06:28 AM
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Registered
Join Date: Jun 1999
Location: UK
Posts: 2
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I recently looked at a 928S which was going cheap and was marketed as "overfueling". I bought it and discovered that it was throwing out large quantities of blueish smoke. Very quickly the oil pressure started falling and the coolant temperature started rising. Head Gasket I thought. I did a cylinder pressure test and found the following: 1 - 150; 2 - 150; 3 - 150; 4 - 160; 5 - 120; 6 - 80; 7 - 150; 8 - 160.
I whipped off the head (took about three days !) and found no. 5 piston showing the telltale signs of running with some foreign object in the bore complete with gouges in the side of the bore, although no. 6 looked strangely OK. I'm going to hone the two offending cylinders (with the engine in the car), replace piston no. 5 and the rings of no.6 but the bores are supposed to be honed with a specialist silicon paste. Haven't yet decided if I'm going to arrange this or chance it without. Just a cautionary tale. Mark Benton UK Moral of the story - make sure the car is REAL cheap ! |
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03-24-2003, 10:42 AM
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Registered
Join Date: Feb 2001
Location: Viera FL
Posts: 5,642
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Mark,
I would hate to see you put in all that work just to set yourself up for failure. The engine (cylinder) WILL self destruct without the alumasil paste. the cylinder needs to be bored, honed and then done with the paste. There is no work around, there is no alternative. That is what protects those delicate aluminum cylinder walls fromthose nasty iron rings. AFJuvat
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Es geht nicht darum wie schnell man faehrt, sondern wie gut man schnell fahren kann. Ihr Brunnen der nutzlosen Porsche Information |
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03-24-2003, 04:36 PM
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