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Registered
Join Date: Oct 2003
Location: Michigan
Posts: 14,093
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Quote:
The drain plug was clean as was the oil pickup screen. What could cause the seat to disintegrate? Poor installation? Not having hardended seats installed?
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1981 911SC ROW SOLD - JULY 2015 Pacific Blue Wayne |
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06-30-2015, 03:11 PM
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Registered
Join Date: Dec 1969
Location: chula vista ca usa
Posts: 5,694
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When I had my 2.8L type four (2001 or so) I had about 40% of a valve head break off and wedge itsself into the top of a piston. I did a full race day with the engine like that and except for a bit of lost power the engine ran right along! The chunk of valve had laid pretty much flat. Every now and then it would do a huge backfire through the right side carb so the engine was pulled and after much thought we switched to titanium valves. I carry around the chunk of valve to this day. The valve seat was banged up too so the head went to Tuttles' for new seats.
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06-30-2015, 04:33 PM
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Registered
Join Date: Oct 2003
Location: Michigan
Posts: 14,093
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Valve seats are intact on all cylinders so we are at a loss for where the debris came from.
My FIL believes that somebody inserted the pieces through the sparkplug hole. Either way, we are moving ahead with putting it back together. I ordered new valves today as the intake in the offended cylinder was bent which is why it was not sealing. All others seal fine.
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1981 911SC ROW SOLD - JULY 2015 Pacific Blue Wayne |
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07-01-2015, 12:01 PM
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Petie3rd
Join Date: Jul 2000
Location: Philly PA
Posts: 4,528
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magnaflux the piston for cracks look around the wrist pin areas as well as the top
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^^^ Stan ^^^ 2019 BMW K1250 GS 2016 HD RK 1988 S4 Auto , Elfenbein Perlglanz, Pearl Gray 1982 5sp Met black and tan sport seats |
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07-01-2015, 04:50 PM
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