Exhaust Flange Bolt Hole Repair
Thread Starter
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Tourer
Joined: Mar 2014
Posts: 452
Likes: 228
From: Northford, CT
Exhaust Flange Bolt Hole Repair
Ah yes the dreaded boogered up Shovelhead exhaust flange bolt hole.
1984 FXSB with oem heads. Running a Thunderheader that I have shimmed as best as I can at the rear mount to keep zero stress at the heads.
Both heads were helicoiled by a PO and it lasted quite a while. The front one is still holding up just fine.
I recently have had issues with the rear pipe bolt backing out and falling out. The helicoil there was boogered up and loose.
Earlier this summer I re-installed another helicoil (5/16-18). It now is starting to back out. It loosens up when the engine is hot.
I am taking a peak at Time Serts. I see they offer what's called a "Big Sert" to use in holes which previously had a failed Helicoil.
Has anyone had experience with these?
Being a Thunderheader, I can't really use two studs but I think I could manage to use a stud on the rear pipe and continue to use the bolt on the front pipe. Thoughts on that? I know it is preferred to use studs instead of bolts here.
1984 FXSB with oem heads. Running a Thunderheader that I have shimmed as best as I can at the rear mount to keep zero stress at the heads.
Both heads were helicoiled by a PO and it lasted quite a while. The front one is still holding up just fine.
I recently have had issues with the rear pipe bolt backing out and falling out. The helicoil there was boogered up and loose.
Earlier this summer I re-installed another helicoil (5/16-18). It now is starting to back out. It loosens up when the engine is hot.
I am taking a peak at Time Serts. I see they offer what's called a "Big Sert" to use in holes which previously had a failed Helicoil.
Has anyone had experience with these?
Being a Thunderheader, I can't really use two studs but I think I could manage to use a stud on the rear pipe and continue to use the bolt on the front pipe. Thoughts on that? I know it is preferred to use studs instead of bolts here.
Last edited by garystaven88; Sep 27, 2022 at 07:19 PM.
Thread Starter
|
Tourer
Joined: Mar 2014
Posts: 452
Likes: 228
From: Northford, CT
Problem is the helicoil itself is pulled out of the head. I agree with safety wire for the bolt but I need a solution for thread repair.
Road Captain
Joined: Jan 2016
Posts: 707
Likes: 165
From: Ashtabula Ohio
My bad,
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Seasoned HDF Member
Joined: Jul 2014
Posts: 8,569
Likes: 3,324
From: Cental, MI
Reason to go with Fastenall is the threads are Standard... Not some Proprietary stuff...
ie 3/8 OD with 5/16 ID... could even go Fine threaded ..which would be Better yet for Stud... not necessarily on the OD of Insert into aluminum!!
ie 3/8 OD with 5/16 ID... could even go Fine threaded ..which would be Better yet for Stud... not necessarily on the OD of Insert into aluminum!!
Last edited by Racepres; Sep 29, 2022 at 09:28 AM.
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From: Michigan 15 Minutes East Of Hell
Seasoned HDF Member
Joined: Jan 2011
Posts: 157,416
Likes: 56,983
From: Michigan 15 Minutes East Of Hell
I've not had problems with my Shovel pipes ... I had a buddy who welded up a boss for an additional bolt and reworked the flange on his ... It was a pretty slick repair