Barry-
No he has not pinpointed the valve for certain and I will ask about the vavle clearance. I am a pain in his a--- with all my questions. He has gone as far as doing the compression test on #4 and #5.
#4 result is 500 = too high= carbon build up. Does this happen with diesel fueluse at all? I know that it is common when unheated WVO is used.
I've no problems at all starting her up until a couple of days ago she hesitates for about 2 seconds then starts up fine but with a rough idle. I'm sure this is related to the cylinder.

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Frankie
It never ends!
1985 300D Turbo 181K Anthracite grey, "SOPHIA"
1984 300 SD Turbo(sold)
2004 Subaru Forester XT,Cayenne red.