92 300SD has 178K. Starts right of way when is cold with no hesitation. then when is warm has serius problems to start, I always have to heat up the glow for 6 to 8 seconds in order to start even when engine is warm. Please advise.

Whats your compression like? shouldnt need to glow to long after a recent run. Is this a 350SD?

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hum.....
1987 300TD 311,000M Stolen. Presumed destroyed

Nest time it's warm, pull the brown vacuum line off the shut off valve before trying to start it. If it starts easily, you'll know the problem lies in the fact that the vacuum is not being completely bled off the shut off valve when starting it warm.

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1977 300d 70k--sold 08
1985 300TD 185k+
1984 307d 126k--sold 8/03
1985 409d 65k--sold 06
1984 300SD 315k--daughter's car
1979 300SD 122k--sold 2/11
1999 Fuso FG Expedition Camper
1993 GMC Sierra 6.5 TD 4x4
1982 Bluebird Wanderlodge CAT 3208--Sold 2/13

When the engine compartment is warm you may have an air leak that is not present when the compartment is cold. Allowing the fuel to drainback a little.

I have had engines that were otherwise good. If they did not see a little glow plug activity even when good and warm they did not light off easily. These were volkswagon products.

Also make sure all your battery and starter connections are tight. My 240 used to turn over really slowly when it was hot. I found a bad connection on the starter.

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Thank you guys for your very valuable points. I will get to work on every point the you mention and will post the results.