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1. 05:56 AM - Thread chaser in spark plug hole (Miller John)
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Subject: | Thread chaser in spark plug hole |
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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