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What mileage when you had to replace valve seals?
I'm toiling over whether to change valve seals or not as I have the cam tower off.
Engine is a very low mileage unit and burns no oil. 62K miles. What is a rough estimate of their life expectancy in miles? Are these seals affected by age the same way as o-rings and other rubber seals? They seem to me to be of a longer lasting material.
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1990 944 T: 100 000 km/63K miles, 1997 986 2.5L: 95 000 km/60K miles, Living in the trackless land of plenty! |
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01-23-2010, 12:50 AM
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Join Date: Mar 2008
Location: Chicagoland
Posts: 2,695
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so how bad is it burning oil on startup and high engine load?
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01-23-2010, 07:13 AM
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It does not burn oil on startup or under load - yet.
I'm simply trying to find out how long they can be expected to last on a street car.
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1990 944 T: 100 000 km/63K miles, 1997 986 2.5L: 95 000 km/60K miles, Living in the trackless land of plenty! |
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01-23-2010, 09:05 AM
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Just thinking out loud
Join Date: Nov 2001
Location: Close by
Posts: 6,884
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Where is the option for over 200K?
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83 944 91 FJ80 84 Ram Charger (now gone) |
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01-23-2010, 12:52 PM
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 good point. Unfortunately I can't change the poll once it's done!
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1990 944 T: 100 000 km/63K miles, 1997 986 2.5L: 95 000 km/60K miles, Living in the trackless land of plenty! |
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01-23-2010, 01:36 PM
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Proprietoristicly Refined
Join Date: Jul 2001
Location: ~Carefree Highway~
Posts: 5,833
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I voted 100K because that is when my head gasket went.
The seals may have been OK. If you decide to install new valve stem seals, there are a couple varieties besides rubber that come in the Victor Reinz HG kit. |
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01-23-2010, 04:20 PM
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Judging by the poll mine should last another 100K at least. However, when I took of the exhaust manifold I discovered a blob of black crud on the bottom of one of the exhaust valve guides. Could this be burnt oil?
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1990 944 T: 100 000 km/63K miles, 1997 986 2.5L: 95 000 km/60K miles, Living in the trackless land of plenty! |
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01-26-2010, 03:30 AM
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Judging by the poll mine should last another 100K at least. However, when I took of the exhaust manifold I discovered a blob of black crud on the bottom of one of the exhaust valve guides. Could this be burnt oil?
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1990 944 T: 100 000 km/63K miles, 1997 986 2.5L: 95 000 km/60K miles, Living in the trackless land of plenty! |
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01-26-2010, 03:36 AM
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All Spooled Up
Join Date: May 2009
Location: Between NE and Central PA
Posts: 2,516
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It could, and most likely is. It would appear that you have a leaker. With such being the case, good time to replace the set. I guess you could just replace the bad one though.
P.S. - I will have what you need when I replace my compressor section with a K27 compressor, tentatively slated for may or june. PM me at that time if still needed.
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>gray 89 951S - K27/8, MAF, 3" intake, 3" exhaust w/separate waste pipe, 55# inj, late cam; >red 87 924S - chip, K&N, punched-out cat&muffler >black 80 924 - (sold) >maroon 77 924 - auto (sold) |
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01-29-2010, 02:54 PM
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Redline Racer
Join Date: Jan 2007
Posts: 2,444
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Make sure you get the reddish colored vitton seals rather than the regular black rubber ones. The vitton stays pliable longer.
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1987 silver 924S made it to 225k mi! Sent to the big garage in the sky |
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01-29-2010, 08:51 PM
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The ones I have are grey on the outside and rubber red on the inside. Are those the ones?
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1990 944 T: 100 000 km/63K miles, 1997 986 2.5L: 95 000 km/60K miles, Living in the trackless land of plenty! |
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01-30-2010, 01:33 AM
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Redline Racer
Join Date: Jan 2007
Posts: 2,444
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I don't know.
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1987 silver 924S made it to 225k mi! Sent to the big garage in the sky |
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01-30-2010, 10:07 AM
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