muskymatt Posted April 18, 2015 Report Share Posted April 18, 2015 Stripped the drain hole on my 9.9 prokicker last fall and was thinking of a thread insert. I assume I would have to drop the lower end to make sure no filings get in! Any suggestions or recommendations would be awesome Thanks Link to comment Share on other sites More sharing options...
misfish Posted April 18, 2015 Report Share Posted April 18, 2015 Are you talking Heli coils? https://youtu.be/RFYa6sjhh_E Link to comment Share on other sites More sharing options...
ecmilley Posted April 18, 2015 Report Share Posted April 18, 2015 First make sure its just not the drain plug. Inserts work fine put lots of helicoils in there usually stronger than original threads. drail oil try to stuff a rag caked in grease behind hole drill slow then slowly remove rag most of debris will come with it Link to comment Share on other sites More sharing options...
muskymatt Posted April 18, 2015 Author Report Share Posted April 18, 2015 Are you talking Heli coils? https://youtu.be/RFYa6sjhh_E Yes, I have done a fair amount of tapping but have never used the coils. Would they hold as well in aluminum? Link to comment Share on other sites More sharing options...
muskymatt Posted April 18, 2015 Author Report Share Posted April 18, 2015 First make sure its just not the drain plug. Inserts work fine put lots of helicoils in there usually stronger than original threads. drail oil try to stuff a rag caked in grease behind hole drill slow then slowly remove rag most of debris will come with it Good info, thanks Link to comment Share on other sites More sharing options...
aplumma Posted April 18, 2015 Report Share Posted April 18, 2015 Make sure you put the heli coil in with an oil proof thread sealer it needs to be sealed since it is a set of threads. Check the thickness of what you are heli coiling it needs to be as thick as the coil is at least. in this case i would drill and tap it rather than helicoil it. Make sure you have the clearance for the tap to be threaded all of the way into the space behind it. Use a larger size plug. you can also tig weld the old hole and drill/tap another one next to it this will allow you to use the stock plug. Art Link to comment Share on other sites More sharing options...
misfish Posted April 18, 2015 Report Share Posted April 18, 2015 You can use loc tite pipe thread sealer. Once it,s in,it in. http://www.henkelna.com/industrial/product-search-1554.htm?nodeid=8797960404993 Link to comment Share on other sites More sharing options...
Bernie Posted April 19, 2015 Report Share Posted April 19, 2015 Heli coils when properly installed are stronger than original threads. Don't be concerned about sealing the threads. The seal surface is after them. Link to comment Share on other sites More sharing options...
muskymatt Posted April 19, 2015 Author Report Share Posted April 19, 2015 Great advice folks. Thanks I think I'll try tapping the hole first as the wall is not very thick. Link to comment Share on other sites More sharing options...
Rob Posted April 20, 2015 Report Share Posted April 20, 2015 Heli coils when properly installed are stronger than original threads. Don't be concerned about sealing the threads. The seal surface is after them. Totally agree. Bulletproof threads Rob C Link to comment Share on other sites More sharing options...
Smokercrafty Posted April 20, 2015 Report Share Posted April 20, 2015 Load your drill bit with some kinda thick grease (wheel bearing grease works, not white lithium). Most of your filings will end up on it, and not your gear case. Link to comment Share on other sites More sharing options...
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