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Old 01-08-2009, 01:50 PM
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Join Date: Aug 2006
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1985 300sd cranking question?

To try and keep a long story short, I have a 1985 300sd and a 1984 300sd. The 1984 starts up fine. The 1985 will not start unless you cycle the glow plugs at least 2 times and I am talking full time even after the glow plug light goes out I watch the dome light brighten then crank. I have replaced the glow plugs, and noticed that they were hard to remove. Could carbon build up cause this problem? Note both cars have about the same mileage 325,000. I did not have a reamer, but if I did use a reamer, where would the crud fall? Suggestions and comments welcome. Thanks

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Old 01-08-2009, 01:57 PM
rrgrassi's Avatar
mmmmmm Diesel...
 
Join Date: Jun 2006
Location: Royse City Tx
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What brand GP? Have you done a valve adjustment lately?

Yes, carbon can act as an insulator, causing premature GP failure and keeping the cylinder from heating up fully.
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Old 01-08-2009, 02:07 PM
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Location: bristol,tn
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You can do like I did,take a old glowplug.Hammer a flat end on it.Grind it to where it sharp,but only .030 oversize standard glowplug.Gently screw it in,you may have to force it, to break carbon.And unscrew,then turn engine over a couple of times to blow out carbon.Remmember size of your reamer should not be as large as threads.

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