Catastrophic 16v failures solved
02-19-2013, 03:38 PM
#17
We here in the PacNW get lots of moisture as you can imagine...even an engine stored inside but in an unheated space will have condensation build up ...could have built up inside the bores..corroding the valves..
02-19-2013, 03:50 PM
#18
Burning Brakes
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The little chamber that the fuel gets injected into to initiate the ignition. It provides a more complete and even burn:
Diesel Indirect Injection from Wikipedia
Diesel Indirect Injection from Wikipedia
02-19-2013, 04:17 PM
#19
Captain Obvious
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The little chamber that the fuel gets injected into to initiate the ignition. It provides a more complete and even burn:
Diesel Indirect Injection from Wikipedia
Diesel Indirect Injection from Wikipedia
02-19-2013, 05:53 PM
#21
Rennlist Member
Condensation or leaked water into an inlet duct could sit on a closed valve, and rust it onto the seat, and first opening of that valve....
Were both bad seats on inlets? Check the back of the valve and the seats for corrosion, but it may have been hammered right out.
My car sat for a while, but I think much less than these cases, and in the centre of Saudi Arabia, and its pretty quiet running still.
Edit: - yes, both inlets , looking at the size relative to the OK valve.
jp 83 Euro S AT 55k
Were both bad seats on inlets? Check the back of the valve and the seats for corrosion, but it may have been hammered right out.
My car sat for a while, but I think much less than these cases, and in the centre of Saudi Arabia, and its pretty quiet running still.
Edit: - yes, both inlets , looking at the size relative to the OK valve.
jp 83 Euro S AT 55k
02-19-2013, 07:13 PM
#23
Rennlist Member
The OTHER visible valve that seems to be correctly seated - looks 'OK' . Is that clearer?
jp 83 Euro S AT 55k
jp 83 Euro S AT 55k
Last edited by jpitman2; 02-19-2013 at 07:40 PM.
02-19-2013, 08:09 PM
#24
Rennlist Member
Thread Starter
Middleton!
02-19-2013, 08:16 PM
#25
Rennlist Member
There is a lot of sodium in that there part of town. It will be in the air,water and your lungs. I know for a fact that wood pellets that are manufactured down there on the waterfront are known to eat pellet stove burn pots up.
Thomas
Thomas
02-19-2013, 08:52 PM
#26
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I think this is all about heat, but some pictures of the head gaskets and that port with the valve removed might tell more.
That one "fire ring" area on the cylinder head that dropped the valve seat is getting pretty darn thin, from coolant attacking that surface.
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GregBBRD@aol.com
Semi-retired, as of Feb 1, 2023.
The days of free technical advice are over.
Free consultations will no longer be available.
Will still be in the shop, isolated and exclusively working on project cars, developmental work and products, engines and transmissions.
Have fun with your 928's people!
02-19-2013, 11:10 PM
#29
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02-19-2013, 11:15 PM
#30
Archive Gatekeeper
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Not sure about stainless, but one part of the valve is magnetic and one is not, the stem is friction welded to the fluted part. No idea what alloys they _really_ are.