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Step 1: Disconnect the buss bar and verify that you have 12v at the feed line when energized.
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| Old and New Plugs |
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| #1 Cyl, Old Plug |
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| #3 Cyl. New Plug |
Step 2: Remove the old glow plugs. Be very careful: Do not to let ANYTHING drop
into the open hole. Make sure that you have removed the soft copper gasket (very small washer visable on tip) when the glow
plug is removed.
Step 3: Install the new glow plug. Tighten it down until it makes contact and then tighen it up about
1/8 of a turn. DO NOT OVER TIGHTEN. It takes a lot less torque to install a glow plug that it does to install
a spark plug.
Step 4: Reconnect the buss bar.
The rest of this page is about repairing the motor when you get step 3 wrong.
If you overtighten the glow plug, it will shear off in the engine block. This is how to remove a
sheared glow plug.
In the picture below, the nut at the top of the sheared glow plug has been reinstalled to help pull the center of the
plug out. The good new plug in the picture is fully seated. Take notice of how much of the glow plug thread is exposed even
when fully seated.
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| Sheared Glow Plug |
To remove the sheared plug: Pull out the center core of the glow plug. This can be done with a pair
of visegrips. Grap the top and keep twisting. Once the core comes out, then you can insert a screw extractor into the plug.
Slowly apply constrant pressure to remove the broken plug.
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