mcratchet1 Posted February 10, 2021 Share Posted February 10, 2021 Ok main belt was worn time to change grab tensioner was loose tried to tighten nope bolt pulled out with a heli coil around it sob! My question obviously owners before me fixed it with coil. Don’t know why it failed can I do the same or does some know a better repair ? It’s In the aluminum front cover tensioner #21291243 or is only right way to replace entire front cover thanks for any help Quote Link to comment https://www.bigmacktrucks.com/topic/65851-help-with-strip-threads-for-belt-tensioner/ Share on other sites More sharing options...
Vmac3 Posted February 10, 2021 Share Posted February 10, 2021 Oh geez, Are the threads in the timing cover that accommodated the heli-coil in good shape? If it is find out what the thread pitch is and see if a new bolt will fit in the bolt hole without any slack. If it is in good shape, I was wondering if you could drill out the belt tensioner so the new bolt will fit in the tensioner without any issues. You would probably need to use a bolt that has a allan head. One option is to fill the bolt hole with a plug weld and re-drill and tap a new hole. Another option would be replacing the timing cover. I would be more inclined to try a larger bolt and drill out the tensioner if possible. Maybe someone else can chime in on this. F or Joey would have some good suggestions. V 1 Quote Link to comment https://www.bigmacktrucks.com/topic/65851-help-with-strip-threads-for-belt-tensioner/#findComment-468726 Share on other sites More sharing options...
Popular Post doubleclutchinweasel Posted February 10, 2021 Popular Post Share Posted February 10, 2021 (edited) 1. Replace Heli-Coil in existing hole if hole is good. Easiest to try. 2. Instead of Heli-Coil, look into a "Threaded Insert". Takes a larger hole than a Heli-Coil, but can be considerably stronger. There are several different styles. Plain. Loctited. And, staked. I have seen these use a "standard" tap of a larger size for the hole. But, most I have used require a special tap, similar to the way a Heli-Coil tap works. Incidentally, I have seen aluminum (and even steel) parts come from the factory with Heli-Coils already in them. Edited February 10, 2021 by doubleclutchinweasel 2 1 Quote "Eagles may soar, but weasels don't get sucked into jet engines." Link to comment https://www.bigmacktrucks.com/topic/65851-help-with-strip-threads-for-belt-tensioner/#findComment-468730 Share on other sites More sharing options...
mcratchet1 Posted February 10, 2021 Author Share Posted February 10, 2021 Ok thanks, the hole was tapped to fit a heli coil I put one in last night but the bolt for tensioner does not seem to get real tight so I’m worried to death it going to come out. I did not know I could drill a hole bigger in tensioner that might be a great idea heli coil is a 10.5 but od is bigger of course the threaded insert sound better I will try to order some just was wondering if they will last or just do the dang cover thanks for your guys professional help I really appreciate it Quote Link to comment https://www.bigmacktrucks.com/topic/65851-help-with-strip-threads-for-belt-tensioner/#findComment-468736 Share on other sites More sharing options...
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