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Originally Posted by dlssmith
Since I'm changing the plugs tomorrow, it may be a little late to ask, but what is meant by using a "glow plug reamer" why is this needed?
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A reamer tool especially made to fit into the opening where the GP is in order to carve away any carbon that is built up as it tends to get that way especially if you don't drive hard and fast often. (Italian tune ups!)
Using a GP reamer is not mandatory however.
I usually turn the engine over after removing the plugs, just a few times to blow out the carbon that reaming knocked loose. If you do this, be sure to disconnect the GP cable at the timer by unplugging it first!!
Just be aware that some GP's have been known to have a blob of coke on the shaft that makes removing them difficult without breaking the tip off in the chamber
That brings its on a new set of problems maybe resulting in having to remove the head to get the tip out.
A trick is to unscrew a plug while pulling against it (after unthreading the body) and the tip will hopefully come out of the carbon if its there, also spray some liquid wrench on it too if its stuck.
Basically go easy on this job and hopefully it goes well.