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Old June 18th, 2014, 12:13 AM
Jackie Treehorn's Avatar
Jackie Treehorn
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1985 (legitimately)
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Glow plug fouling

In the process of doing the timing belt replacement, I removed the glow plugs as instructed and found that one looks oily and more sooty than the others. Is this something I should be concerned about? I didn't notice if it was looser than the others when removing, but maybe the plug wasn't sealed tightly allowing some compression to escape.
What do you think?
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Old June 18th, 2014, 02:09 AM
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Could be a variety of things. I'd start with a compression test. Since it is oily, could be a valve related problem. Could be a leaking injector. The LR book says to replace injectors every 80K miles, though I did run mine until 125K and the engine was still running smooth with the old injectors. You can have your injectors "pop" tested at a diesel injection repair shop. Keep track from which cyl each comes from.

The glow plugs should be Ohm tested (cold) and the results should be similar, within 0.1 of each other. I only use mine in the winter, as needed, and pull the fuse that makes them work the rest of the year.
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Old June 18th, 2014, 08:45 AM
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John B.
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The seal is at the bottom, where the tip meets the body. Oil above there means it was leaking or oil leaked into the hole from above.

If a tip itself is sooty, it usually mean the plug is not working.
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Old June 18th, 2014, 09:40 AM
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Robert Davis
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John gives a good explanation...

Be sure and replace all with new plugs.

I would also check the injectors to verify that there is not any over fueling which could also give a sooty-er than "normal" glow plug.

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