Spark Plug "Frozen" in Cylinder Head
(4 July 2015)
Use an impact wrench on a low torque setting, both reverse and forward. The hammering it gives will break things free that you would twist off with a hand wrench.
Contributed by RobertTX
You could also try some heat. A propane torch is fine. Remove whatever chemical you have on the plug. Heat the plug pretty hot, getting the head hot too. Not too hot, you might warp the head. turn the torch off and as it begins to cool down apply a little of the liquid wrench or what ever you have that is thin in viscosity. As the parts cool the liquid will be pulled into the threads. I would do this from both sides of the work.
Contributed by Bob
You can use Marvel Mystery Oil, available at most NAPA stores. Pour it on and let it do the work. It took forty years for it to get stuck, give it a little time to unstick
Contributed by oslofile in NC
This was meant for diesel engines. I'm not sure if it can be applied to the gas engines but I would think so:
If the engine starts to make odd noises (knocking etc.) you have to determine where it is coming from. How to determine if the noise is caused by the fuel system (wrong timing etc.) or if there is a problem in the engine itself? It's simple. Increase the RPM a little and pull the stop lever and listen carefully. If the noise stops when the fuel is shut off (on diesels) the problem is in the fuel system. If the engine makes the noise while spinning its last revs before stopping, the problem is in there.
Contributed by TH
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