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#1 (permalink) Old 11-08-2005, 01:30 PM
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Seized Spark Plugs

I have a 1997 318ic that is in need of a spark plug change as it is mis firing. I cannot remove the no 2 and 3 plugs. I was getting a clutch replaced and asked my mechanic if he could do it but was advised it might damage the threads in the head and then it would need to be rethreaded and all the associated work that goes with removing the cylinder head and replacing the head gasket etc. Any suggestions? Should i just put an extension bar on and do what it takes to get them out and hope i dont damage anything as the car is barely driveable right now. thanks for any advice
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#2 (permalink) Old 11-08-2005, 09:25 PM
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Get some penetrating oil ....warm engine.

Get some JB Blaster penetrating oil (any autoparts store...) and spray the base of the plugs when the motor is warmed up. Let it sit in there for a few minutes and remove the plugs. If they're binding try working them each direction to free up the threads and let more JB soak in. When you re-install them use a quality 3/8" torque wrench and only torque them to specs, don't over torque 'em. If the threads come out of the head you can always use Helicoil inserts to repair them, that's what most shops would do. But you should be alright. Also if you have an electric impact driver the vibration from the impact driver helps free up the stuck plugs too without damaging the head threads.







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#3 (permalink) Old 11-09-2005, 09:46 AM
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Thanks Mike,

I will try the penetrating oil and see how it goes,

I tried and unfortunatly no luck. I got the no 3 to turn a few times and then in jammed up again. I then ended up cracking the socket so if it needs this much force mabey i am better off leaving it to the pros.

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#4 (permalink) Old 11-10-2005, 03:28 AM
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i would if i were you, last thing you want is to snap the plug inside the sleeve................... man that actually sounds very expensive, to drill out an already seized plug, ewwwww good luck , and let us know of any updates

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#5 (permalink) Old 11-10-2005, 05:40 AM
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And make sure you lubricate the threads when you install the new plugs.

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