Hi there,
Thank you for the donation.
It sounds as if the thread is damaged, you will have to get it re coiled as just running a tap down the thread will not fix this problem, It is recommended that the head is removed to do this as metal will enter the cylinder and you will nor be able to get it all out.
Mark (mhpautos)
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Wednesday, February 4th, 2009 AT 5:33 PM