Quote:
Originally Posted by 97 SL320
Blindly ripping things apart before a proper diagnosis is performed is a sure route to more problems / failure.
The proper route would have been to perform a leak down then you would have known for sure if there was a leak from combustion to coolant. This would have also identified the exact cylinder.
The leak area you have high lighted leads to a dowel pin and not coolant. It is possible that slight combustion gasses were making their way to the dowel pin but that isn't the cause of the overheat.
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I'm perhaps not as blind as you think.
The transmission had partially failed ;
and the engine had shown exhaust guide wear from a leakdown test and chain measurement done several months ago.
Doing a proper leakdown --with known leaking valve guides-- is a bit of a crap shoot, yes?
And the "threaded boss" is just that; NOT the dowel pin next to it, which is also
rusted. And its the only boss with rust, as previously stated.
In particular, I am concerned by the SPALLED tracks between the cylinder sealing area, the dowel pin perimeter and the boss
... which might/might not show combustion gas mixing with something else, like coolant from the port to the left of the boss --
-- IF I'm not "blind". Sarcasm noted.
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--frankb
1982 300TD 617.912 <NLA> . 1975 2002 E10-EFI . 1976 914c6 . 1983 MG LMIII <NLA>. 1988 Montero / 616<NLA> . 2001 TLS . 2005 Saab 9-5 Wagon
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