Quote:
Originally Posted by leathermang
The real danger is an engine with the valves set in ' the twilight zone'...
At least half the cooling to a valve comes from being in contact with the head...
that is why the minimum valve ' margin' is specified by the factory ... the length of the seating surface on the valve rim... and the valve setting specs are enough so that a valve which is getting longer due to heat still firmly contacts the head when running...
The worst situation is a valve setting which will allow the car to run... and keep running... but allow heat to build up in that valve due to lack of strong contact with the head to convey ( through convection ) enough heat to keep from burning the valve...
For those who can not wait until their engine is cold in mid winter.... at least let it cool over night and set it cold in the morning.
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This is excellent advice !!! Could not have put it better! 
If you want your indi to do your valves, best drop the car off the night before. The results will be better!!
Charlie,
You will probably need to do those valves again in a couple of hundred miles when the seats have had time to clean.
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Grumpy Old Diesel Owners Club group
I no longer question authority, I annoy authority. More effect, less effort....
1967 230-6 auto parts car. rust bucket.
1980 300D now parts car 800k miles
1984 300D 500k miles 
1987 250td 160k miles English import 
2001 jeep turbo diesel 130k miles 
1998 jeep tdi ~ followed me home. Needs a turbo.
1968 Ford F750 truck. 6-354 diesel conversion.
Other toys ~J.D.,Cat & GM ~ mainly earth moving
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