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Thread chaser in spark plug hole

 
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gengrumpy



Joined: 07 May 2013
Posts: 115
Location: Tullahoma, TN

PostPosted: Fri Apr 22, 2016 4:55 am    Post subject: Thread chaser in spark plug hole Reply with quote

Here is a caution tip for you.

I normally use a thread chaser to clean out the carbon deposits in the spark plug threads during my annuals. Have done this successfully for a number of years.

This year, the thread chaser went in too far and disengaged from the threads in #3 cylinder. All attempts to get it re-threaded coming back out failed, and I finally had to brute force it back out, destroying much of the threads tapped into the head in addition to the heli-coil insert.

End result? New cylinder…..repairing the old cost nearly as much as a new one. I might could have just taken the cylinder off and tried to work it back out from the inside, but by the time I thought of that, the thread chaser was stuck solid in the threads….

Advice: if you use a thread chaser on the spark plug holes, put a washer or 2 on it so that it cannot drop out of the threads inside of the head.

grumpy


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