Just to update everyone, I replaced this motor with a used one in 2011 and recently sold the failed motor to Jake with a request for a failure analysis. Today I received word that it was a stretched timing chain which I assume must have been the chain between the crank and IMS, since valves were bent on both heads.
From page 8 of this thread:
Quote:
Originally Posted by Paul
Found some more time today so I removed the cylinder head cover for 4-6. Looks like 10,000 -12,000 mile oil changes with Mobil 1 at least kept the engine clean:
Another blow down check verified all valves are bent since air flows from both the exhaust ports and the intake manifold:
All chains are intact and working:
I'm guessing the gear on the IMS must have slipped 360 degrees. This means a complete tear down is needed. |
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1998 Boxster with 7.8 DME, 2005 3.6 liter/325 hp, Variocam Plus, 996 Instrument panel
2001 Boxster original owner. I installed used motor at 89k.
1987 924S. 2002 996TT. PST-2
Owned and repaired Porsches since 1974. Porsche: It's not driving, it's therapy.
Last edited by Paul; 06-25-2014 at 05:41 PM.
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