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gengrumpy
Joined: 07 May 2013
Posts: 131
Location: Tullahoma, TN
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 Posted: Fri Apr 22, 2016 4:55 am Post subject: Thread chaser in spark plug hole |
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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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Bob Turner
Joined: 03 Jan 2009
Posts: 885
Location: Castro Valley, CA
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| Posted: Fri Apr 22, 2016 1:32 pm Post subject: Re: Thread chaser in spark plug hole |
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Sorry about your troubles.
Years ago one of my partners described a tool he had seen - I think it was a Snap-On. Specifically for plug helicoils, you turned one control and the entire tool contracted (in diameter). You inserted it all the way into the hole, turned the knob and re-expanded the tool, then chased the threads while moving the tool outwards. this way, the dirt tended to be pulled out of, rather than into, the cylinder. Of course the price was astronomical.
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Bob Turner
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