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In Reply to: Cross theaded spark plug - help? posted by brian [uk] on February 03, 2002 at 18:47:36:
Just purchased a 1991 730, I have a 1989 530 which I am going to sell.
The 730 is in reasonable condition, and I got the car today and was changing
over many of the newer items fitted on the 530.
3 of the spark plugs have been cross treaded on the 730. Got 2 of them out
but one wont budge. What should I do?
Change the heads over - the 530 has had a recent head overall?
Any tricks for removing the cross treaded spark plug. It's off set by say
10% and not fully screwed in.
Should I leave it till the spark plug fails and then attack the problem then.
I don't want to snap the plug off.
Any ideas please?
Judging by the state of the plugs - they have been in 6 months or so.
Thanks
Brian [UK]
Brian, get a spark plug thread chaser( similar to a tap) to clean up the threads on the two that came out. The other plug - I don't know but if it runs ok leave it alone. I am curious to what others have to say. You can use a heli-coil to install new threads when the old threads are damaged beyond repair. If I had to remove the plug I guess I would try squirting oil in there to aid in removal and possibly use aair powered ratchet with the expectation that I would ruin the thread and have to heli coil. Best advice leave it alone if possible. good luck .mike
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