Hi all,

These are the glow plugs that I have pulled from my engine. OM617-951. Over the winter, I had to replace three plugs with what I had for spares, which were Autolite plugs. Yesterday, my girlfriend and I replaced all 5 plugs in the car with new Bosch plugs. I also reamed the GP holes before installing the new plugs.

I am wondering about the white build up on some of the tips. Usually that means advanced injection timing but I am pretty sure I have the opposite problem just based on how the engine runs. Perhaps someone can explain in more detail. Or perhaps, I am worrying about nothing.

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1991 F250 super-cab 7.3 IDI. (rebuilt by me) Banks Sidewinder turbo, hydroboost brakes, new IP and injectors.
2003 S430 - 107K
1983 300SD - Tanoshii - mostly restored ~400K+.
1983 300SD - Good interior. Engine finally tamed ~250K.
Monark Nozzle Install Video - http://tinyurl.com/ptd2tge