heli coil??
Novice
Joined: Oct 2006
Posts: 21
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From:
RE: heli coil??
the helicoil works by drilling a size up from original ie if the original thread is 1/4 then you have to drill for a 5/16 tap, then the 1/4 helicoil is wound into giving a new hardend 1/4
thread. They come as a kit with exact drill & tap size & the tool to wind in the replacment thread.
I have used them many times as a race mechanic & found them very good.
thread. They come as a kit with exact drill & tap size & the tool to wind in the replacment thread.
I have used them many times as a race mechanic & found them very good.
Seasoned HDF Member
Joined: Apr 2006
Posts: 10,675
Likes: 95
From: Billings,Mt.
RE: heli coil??
Get a heli coil kit for that size thread.Sorry I dont know what size it is.
If the thread is a blind hole then you dont need to worry about the chips to much.You dont want the chips to get inside the case.
If the hole is thru then it would be a good idea to remove the cover if practical so the chips dont go inside.
Automotive and hardware stores sell the kits.
Hope this helps.
If the thread is a blind hole then you dont need to worry about the chips to much.You dont want the chips to get inside the case.
If the hole is thru then it would be a good idea to remove the cover if practical so the chips dont go inside.
Automotive and hardware stores sell the kits.
Hope this helps.
Elite HDF Member
Joined: Oct 2005
Posts: 3,872
Likes: 83
From: Canton, Michigan
RE: heli coil??
I doubt if a Helicoil will solve your problem. I think that the thickness of the primary cover in that area is not sufficient to adequately install the fix. If the threads aren't too boogered up, run a tap through them to clear them out. Then when you put the derby cover back on put a liberal amount of thread sealer (LocTite thread sealer with teflon) on the screw. If that doesn't work, you could possibly redrill and tap the hole for the next larger size (perhaps even go metric if needed). You might run into issues with the head of the new machine screw being to large for the derby cover.
The last resort of course, is to replace the primary cover, and remember from now on that anything threaded into aluminum needs to go in 'hand tight' first...Then put the wrench on it.
The last resort of course, is to replace the primary cover, and remember from now on that anything threaded into aluminum needs to go in 'hand tight' first...Then put the wrench on it.
Seasoned HDF Member
Joined: Apr 2006
Posts: 10,675
Likes: 95
From: Billings,Mt.
RE: heli coil??
ORIGINAL: Hackd
I doubt if a Helicoil will solve your problem. I think that the thickness of the primary cover in that area is not sufficient to adequately install the fix.
I doubt if a Helicoil will solve your problem. I think that the thickness of the primary cover in that area is not sufficient to adequately install the fix.
Helicoils come in a few different lenghts.
Even if the thread was chased with a tap,the thread will still be striped.
Elite HDF Member
Joined: Oct 2005
Posts: 3,872
Likes: 83
From: Canton, Michigan
RE: heli coil??
ORIGINAL: 1FLTRI4ME...How thick is the mat'l there?...Helicoils come in a few different lenghts...Even if the thread was chased with a tap, the thread will still be striped...
ORIGINAL: Hackd...If the threads aren't too boogered up, run a tap through them to clear them out. Then when you put the derby cover back on put a liberal amount of thread sealer (LocTite thread sealer with teflon) on the screw...
[IMG]local://upfiles/4811/C754F09A5C7C4C0E924EE45F0626F33D.jpg[/IMG]
Cruiser
Joined: Jul 2006
Posts: 240
Likes: 1
RE: heli coil??
I saw the demonstration of back pack thread straihtening devise. It looked so easy but as he was withdrawing the tool just with a flick of fingers looked un real. I thought there would be some reasonable resistance when you were straightening threads out.?
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Road Warrior
Joined: Nov 2005
Posts: 1,942
Likes: 2
From: LAKESIDE CA.
RE: heli coil??
got my primary cover real chep because somebody had broken a bolt and trie to drill it out
I used a threat insert called keen sert works great just seal the back side with something
so it doesn't leak out the hole plenty of material to do the repair
the thread is 1/4-20 or 28 take the bolt with you to get the right one..
good luck
[IMG]local://upfiles/5757/E9A9218A543C45189F993896B40AD636.jpg[/IMG]
I used a threat insert called keen sert works great just seal the back side with something
so it doesn't leak out the hole plenty of material to do the repair
the thread is 1/4-20 or 28 take the bolt with you to get the right one..
good luck
[IMG]local://upfiles/5757/E9A9218A543C45189F993896B40AD636.jpg[/IMG]
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Elite HDF Member
Joined: Oct 2005
Posts: 3,872
Likes: 83
From: Canton, Michigan
RE: heli coil??
ORIGINAL: Dancemax..I saw the demonstration of back pack thread straihtening devise. It looked so easy but as he was withdrawing the tool just with a flick of fingers looked un real. I thought there would be some reasonable resistance when you were straightening threads out.?
[IMG]local://upfiles/4811/E94830B9F9864110B827D4E84C8C0E50.jpg[/IMG]
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