Today's Message Index:
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1. 05:55 AM - Thread chaser in spark plug hole (Miller John)
2. 02:33 PM - Re: Thread chaser in spark plug hole (Bob Turner)
Message 1
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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
Message 2
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| Subject: | Re: Thread chaser in spark plug hole |
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
RV-10 QB
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http://forums.matronics.com/viewtopic.php?p=455348#455348
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