helicoil
Thread Starter
|
Cruiser
Joined: Jun 2015
Posts: 152
Likes: 33
From: Mich.
helicoil
So one of my holes that hold my derby cover in place is stripped. I tried re-tapping the hole and doing some silicone on the threads still not grabbing. It is the bolt at the 7 o'clock position so a little worried about riding with it. Looks like a helicoil is a good option to repair the problem. My question is how far to drill the hole out. (Depth) I assume to deep will cause a big problem. Thanks.
Ozzy
Ozzy
Grand HDF Member
Joined: Apr 2007
Posts: 3,723
Likes: 3,063
From: Brighton, MI
Grand HDF Member
Joined: Apr 2007
Posts: 3,723
Likes: 3,063
From: Brighton, MI
If you were just drilling a hole to tap a 1/4 x 20 thread in a hunk of metal, you would use a #7 or 13/64 (.2010") bit.
For a 1/4 x 20 helicoil, the recommended drill bit (by helicoil) is a 17/64 (.2570) bit.
So you ask for a 1/4 x 20 helicoil kit and pick up a 17/64 drill bit.
http://www.lincolnmachine.com/tap_drill_chart.html
What are you rethreading/repairing? Helicoil is not the only option. YD
For a 1/4 x 20 helicoil, the recommended drill bit (by helicoil) is a 17/64 (.2570) bit.
So you ask for a 1/4 x 20 helicoil kit and pick up a 17/64 drill bit.
http://www.lincolnmachine.com/tap_drill_chart.html
What are you rethreading/repairing? Helicoil is not the only option. YD
Grand HDF Member
Joined: Apr 2007
Posts: 3,723
Likes: 3,063
From: Brighton, MI
Heli coil will work fine for that. Plenty of threads posted on the same problem. Just take your time and go slow. make sure you drill and tap nice and straight.
Places like Orielly and autozone sell the helicoil or similar brand kits. If done right, it will function as it did new.
I know my dodge diesel cummins engine came from the factory with helicoils installed on certain intake fasteners and no issues. YD
Places like Orielly and autozone sell the helicoil or similar brand kits. If done right, it will function as it did new.
I know my dodge diesel cummins engine came from the factory with helicoils installed on certain intake fasteners and no issues. YD
Trending Topics
Club Member
Joined: Jun 2007
Posts: 45,429
Likes: 2,897
From: Bedford UK
Helicoils are designed for new build, not repairs, although they do get used for that. Any aircraft engine will have umpteen of them - dozens of helicoils flying in loose formation!
HD Forum Stories
The Best of Harley-Davidson for Lifelong Riders
8 Best Harley-Davidson Motorcycles Ever
Pouria Savadkouei
10 Worst Harley-Davidson Motorcycles Ever
Pouria Savadkouei
Killer Custom's Jail Break Is The Breakout That Refused to Blend In
Verdad Gallardo
Crazy Bunderbike Build Looks Amazing, But Is It Impossible to Ride?
Verdad Gallardo
Harley-Davidson Reveals Super Cool Cafe Racer Concept
Verdad Gallardo
Engraved Rebellion: Inside Bundnerbike's Glam Rock II
Verdad Gallardo
10 Motorcycles You Should Never Buy
Joe Kucinski
10 Things Harley-Davidson Needs to Fix in 2026
Verdad Gallardo
Southpaw Super Glide: A Left-Hand-Drive 1979 Harley FXE Built to Fit the Rider
Verdad Gallardo
Seasoned HDF Member
Joined: Apr 2006
Posts: 10,675
Likes: 95
From: Billings,Mt.
Measure the depth of the hole and buy an insert that is about 1/2 to 2/3 of the hole.
Drill to the existing depth, then counter sink hole to about 5/16 dia. with a 120 Deg. countersink.
Install the insert 3/4 to 1 1/2 turn from the top of hole.
Break the tang and remove.Remove it with small tweezers or holding a air nozzle 90 deg to the hole will remove it.
Drill to the existing depth, then counter sink hole to about 5/16 dia. with a 120 Deg. countersink.
Install the insert 3/4 to 1 1/2 turn from the top of hole.
Break the tang and remove.Remove it with small tweezers or holding a air nozzle 90 deg to the hole will remove it.
Seasoned HDF Member
Joined: Jan 2011
Posts: 157,417
Likes: 56,984
From: Michigan 15 Minutes East Of Hell
Time-sert ( http://www.timesert.com/ ) is a viable option and is ( usually ) easier for a novice than a Heli-Coil