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hotwheels
Joined: 01 Jun 2007
Posts: 240
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 Posted: Sun Jul 26, 2009 9:35 am Post subject: More fun with rebuilt engines |
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I attempted to unbugger a couple of spark plug holes on my rebuilt engine (not yet run) using a chip chaser. It's obvious that a couple of holes need new heli-coils as the chip chaser wouldn't go in easily and some of the heli-coil came out.
Any advice on how to proceed? I've not done this sort of thing before and like most things I'm sure it's not a big deal the second time around.
There's a Lyco SB 1043A on heli-coil replacement, but I haven't been able to find it using internet search.
This link has a couple of repair kit options (some are expen$sive). http://www.skygeek.com/heli-coil-screw-thread-inserts.html
Regards,
Jay
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Bob Turner
Joined: 03 Jan 2009
Posts: 885
Location: Castro Valley, CA
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| Posted: Sun Jul 26, 2009 1:01 pm Post subject: Re: More fun with rebuilt engines |
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I think most chip chasers are generally not recommended for this use. For next time, Snap-On (who else?) makes a very special tool for cleaning out spark plug helicoils. You turn an internal bolt and the whole thing collapses inwards. You can then insert it into the cylinder, turn the bolt the other way and expand it back out, then clean the threads from inside to the outside as you screw it out. This works when it's the outside of the hole that's the problem (as from cross threading and forcing plugs in). It also carries the gunk out of the cylinder, instead of into it.
I've never removed a helicoil myself, but cylinder shops do this all the time. And yes, there are special insertion tools for putting in new ones. The one thing I do know is that when you're all done and break off the insertion tang, you want to be sure there is no sharp point left on the inside, where it could act as a glow plug and cause pre-ignition.
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Bob Turner
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hotwheels
Joined: 01 Jun 2007
Posts: 240
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| Posted: Fri Aug 07, 2009 6:23 am Post subject: Re: More fun with rebuilt engines |
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I had an A&P make a house call to replace two helicoils in my IO540. It took about 1.5 hours to complete both including sucking / flushing out thread debris.
Some rather interesting (clever) tools were required for the install that I'd not seen before. Good learning experience.
Jay
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