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  #1  
Old 31st August 2019
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Default Help (Lifters; Threads Pulled Out)

Ok guys, I need suggestions here... I went to install my lifters and guides only to have the threads pull out before even starting to snug-up, the other three no problems.
What’s the best way to fix this ?

Thanks, Kevin
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Old 31st August 2019
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Clean out the bolt holes first or use the correct length bolts?

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Old 31st August 2019
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It looks like the rear exhaust? Drilling and tapping for a heli-coil would be a logical plan, but if the cylinders and heads are on drilling a straight hole may be difficult.

So if the top end is on what about the possibility of temporarily using a longer bolt that may engage some undamaged threads deeper in the hole? It doesn't take much force to hold the tappet guides in.

Were you trying to press the guide in the hole with the screw? It looks like the damage is only at the top of the hole.
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Originally Posted by needspeed View Post
It looks like the rear exhaust? Drilling and tapping for a heli-coil would be a logical plan, but if the cylinders and heads are on drilling a straight hole may be difficult.



So if the top end is on what about the possibility of temporarily using a longer bolt that may engage some undamaged threads deeper in the hole? It doesn't take much force to hold the tappet guides in.



Were you trying to press the guide in the hole with the screw? It looks like the damage is only at the top of the hole.


Topend is off so yeah, helicoil time , I’ve never used them before but it can’t be “that” difficult...right? Lol.
I’m assuming that because it’s a 5/16-18 bolt , I would use a 5/16 -18 helicoil kit?


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Old 31st August 2019
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Quote:
Originally Posted by Yakcm2 View Post
I’m assuming that because it’s a 5/16-18 bolt , I would use a 5/16 -18 helicoil kit?
Yes
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Old 31st August 2019
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Quote:
Originally Posted by Yakcm2 View Post
Topend is off so yeah, helicoil time , I’ve never used them before but it can’t be “that” difficult...right? Lol.
I’m assuming that because it’s a 5/16-18 bolt , I would use a 5/16 -18 helicoil kit?


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Drill following the hole, keep the drill straight. Keep the tap straight. You need to pull the drive tang out after installing the heli-coil. Open up a cotter pin and put a sharp bend on one end to make a tool to pull the tang out.
Practice installing a heli-coil on something else first.

Another alternative if there enough thread left is to install a stud.
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Thanks guys for the advice,
There looks to be some threads left so I’m gonna try a stud first (don’t have the $20. For a helicoil kit right now)
So I’ll post a update an let anyone who cares know how it turns out. Again thanks
Kevin
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Old 31st August 2019
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keen sert is way better than heli-coil.
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Old 31st August 2019
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If you end up going with a helicoil, be sure to use the helicoil tap that comes with the set. Standard taps will cut too big and the helicoil will be loose. Be sure you use the right length helicoil too.
Some guys leave some to the coil even with teh top of the hole and those will back out if given half a chance. When you get the helicoil installed, the end of the coil closest to the open end of the hole should be 3/4 to one turn deep so that end will dig in, anchoring itself from backing out.
Keenserts are good if you have enough wall thickness 'cause a Keensert has solid walls and won't be so prone to air or fluids weeping past between outside of threads and the threaded hole you're repairing.
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Quote:
Originally Posted by JonesL View Post
If you end up going with a helicoil, be sure to use the helicoil tap that comes with the set. Standard taps will cut too big and the helicoil will be loose. Be sure you use the right length helicoil too.
Some guys leave some to the coil even with teh top of the hole and those will back out if given half a chance. When you get the helicoil installed, the end of the coil closest to the open end of the hole should be 3/4 to one turn deep so that end will dig in, anchoring itself from backing out.
Keenserts are good if you have enough wall thickness 'cause a Keensert has solid walls and won't be so prone to air or fluids weeping past between outside of threads and the threaded hole you're repairing.


Thanks JonesL for the excellent advice, turns out I freaked out too soon, I was able to clean out the top 3 threads which left 6-7 lower that I could get a bite into with a slightly longer bolt...should be fine for now, but definitely next time it comes apart it’ll get a helicoil.

Again thanks everyone that gave thoughtful advice

Kevin
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