Helio -Coil

How to keep the Cessna 170 flying and airworthy.

Moderators: GAHorn, Karl Towle, Bruce Fenstermacher

Post Reply
skydreamer
Posts: 5
Joined: Mon May 12, 2014 10:58 pm

Helio -Coil

Post by skydreamer »

Can Helio - coil be inserted without removing the tire and tube?
User avatar
daedaluscan
Posts: 497
Joined: Fri Apr 20, 2012 7:03 pm

Re: Helio -Coil

Post by daedaluscan »

In a wheel for the cover? If you drill through the rim the wheel would be toast any way, but much easier to do on a bench. One of my wheels has been drilled and tapped for a size up, which while a pain is simpler. I think it may be a bit shalllow for a heli-coil anyway?
Charlie

1956 170B C-GDRG #27019
skydreamer
Posts: 5
Joined: Mon May 12, 2014 10:58 pm

Re: Helio -Coil

Post by skydreamer »

Thanks for the info
n3833v
Posts: 857
Joined: Tue Apr 23, 2002 6:02 pm

Re: Helio -Coil

Post by n3833v »

You can shorten heli-coils. You just want a couple coils to hold. We use them a lot.

John
John Hess
Past President 2018-2021
President 2016-2018, TIC170A
Vice President 2014-2016, TIC170A
Director 2005-2014, TIC170A
N3833V Flying for Fun
'67 XLH 900 Harley Sportster
EAA Chapter 390 Pres since 2006
K3KNT
User avatar
n2582d
Posts: 2808
Joined: Mon Apr 29, 2002 4:58 am

Re: Helio -Coil

Post by n2582d »

I like Pete’s advice here:
pdb wrote:Just a heads up. I went into our local aviation parts store, found a new Cleveland wheel and bought a number of the machine screws that fitted perfectly and were the correct match. At the field I took the new screws out and discovered that the previous owner (>20years ago) had already drilled out and retapped my wheels to the next size up. Now those threads are mostly stripped.

I was given one word of caution about the use of helicoils worth considering. A steel helicoil in a magnesium wheel presents the potential for corrosion as a result of the contact between dissimilar metals.

I still haven't fixed my wheels and I am now leaning towards cleaning out the holes, filling with JB Weld, and retapping.
Looking online for epoxies to use for thread repair I’ve seen mixed reviews ... but wouldn’t hurt to try.
Gary
User avatar
ghostflyer
Posts: 1390
Joined: Mon Apr 21, 2008 3:06 am

Re: Helio -Coil

Post by ghostflyer »

One unauthorised repair that I have seen on a rim that has been drilled all the way through when going up a size on the hub cap attachment screws was the repair was carried out with heli-coils and then the area was filled with PRC1422 and the screw was inserted with grease on it so the PRC doesn’t stick to the screw.
Post Reply