Fairchild Club Forum

On Sat, Aug 4, 2018 at 7:11 PM, Ranchaero Wing Shop david@ranchaerowingshop.com [fairchildclub] wrote:
 
As I mentioned in a previous post, the camshaft housing cover was
leaking oil considerably at the hold down studs. I've removed the cover
with the plan to use Hylomar and silk thread. While removing the cover,
I found that many of the studs are loose, and the gasket seal job looked
a little sloppy around the stud holes. Several of the studs unscrewed
while removing the steel lock nuts holding down the cover. So, I've
started testing each stud using double jammed nuts. When the stud feels
looser than I think it should be, I remove it, clean it, and replace it
using Loctite blue medium strength, turning it down as tight as I dare.
So far so good, but now I'm wondering if I should be using the red
"permanent" grade Loctite instead of blue. What do you Ranger experts do?

Also, it seems to me there should be a procedure for setting the studs
though I can't find it in the overhaul manual. How tight do these studs
need to be? There should be a torque value or some calibrated method for
this process besides just "feel". I'm afraid of over-tightening and
stripping the hole. It appears the person who set these studs also was
worried about over-tightening and left them looser than they need to be.
I see one helicoil type insert already used and damn sure don't want to
go there.

Any advice with this process would be much appreciated.

David

On 5 Aug 2018, at 14:54, Curt Kinchen ptcurt@gmail.com [fairchildclub] wrote:







You are on the right track. I ran into the same issue a few times. I installed the stud, then tested it with the called out torque for the cover attach nuts per the book. If the stud popped, then I used a helicoil. It's simply a matter of too many years with the dissimilar metal corrosion potential of the steel stud and magnesium housing. Installing the studs with loctite or, thinking about it, with some corrosion preventative sealant might help prevent further corrosion.



On Sat, Aug 4, 2018 at 7:11 PM, Ranchaero Wing Shop david@ranchaerowingshop.com [fairchildclub] wrote:





As I mentioned in a previous post, the camshaft housing cover was

leaking oil considerably at the hold down studs. I've removed the cover

with the plan to use Hylomar and silk thread. While removing the cover,

I found that many of the studs are loose, and the gasket seal job looked

a little sloppy around the stud holes. Several of the studs unscrewed

while removing the steel lock nuts holding down the cover. So, I've

started testing each stud using double jammed nuts. When the stud feels

looser than I think it should be, I remove it, clean it, and replace it

using Loctite blue medium strength, turning it down as tight as I dare.

So far so good, but now I'm wondering if I should be using the red

"permanent" grade Loctite instead of blue. What do you Ranger experts do?



Also, it seems to me there should be a procedure for setting the studs

though I can't find it in the overhaul manual. How tight do these studs

need to be? There should be a torque value or some calibrated method for

this process besides just "feel". I'm afraid of over-tightening and

stripping the hole. It appears the person who set these studs also was

worried about over-tightening and left them looser than they need to be.

I see one helicoil type insert already used and damn sure don't want to

go there.



Any advice with this process would be much appreciated.



David









--

Curt Kinchen

ptcurt@gmail.com







[Non-text portions of this message have been removed]

 
Hi
I have a couple of helicoils in my cam cover, they seem to be fairing well. I made a good fitting gasket plus small amount of good quality gasket sealant on my Ranger and it does the job, been 150 hours without an issue. Use a small ratchet and feel them down.
All the best
Richard
[image1.png]

Sent from my iPhone

On 5 Aug 2018, at 14:54, Curt Kinchen ptcurt@gmail.comptcurt@gmail.com [fairchildclub] wrote:



You are on the right track. I ran into the same issue a few times. I installed the stud, then tested it with the called out torque for the cover attach nuts per the book. If the stud popped, then I used a helicoil. It's simply a matter of too many years with the dissimilar metal corrosion potential of the steel stud and magnesium housing. Installing the studs with loctite or, thinking about it, with some corrosion preventative sealant might help prevent further corrosion.

On Sat, Aug 4, 2018 at 7:11 PM, Ranchaero Wing Shop david@ranchaerowingshop.comdavid@ranchaerowingshop.com [fairchildclub] wrote:


As I mentioned in a previous post, the camshaft housing cover was
leaking oil considerably at the hold down studs. I've removed the cover
with the plan to use Hylomar and silk thread. While removing the cover,
I found that many of the studs are loose, and the gasket seal job looked
a little sloppy around the stud holes. Several of the studs unscrewed
while removing the steel lock nuts holding down the cover. So, I've
started testing each stud using double jammed nuts. When the stud feels
looser than I think it should be, I remove it, clean it, and replace it
using Loctite blue medium strength, turning it down as tight as I dare.
So far so good, but now I'm wondering if I should be using the red
"permanent" grade Loctite instead of blue. What do you Ranger experts do?

Also, it seems to me there should be a procedure for setting the studs
though I can't find it in the overhaul manual. How tight do these studs
need to be? There should be a torque value or some calibrated method for
this process besides just "feel". I'm afraid of over-tightening and
stripping the hole. It appears the person who set these studs also was
worried about over-tightening and left them looser than they need to be.
I see one helicoil type insert already used and damn sure don't want to
go there.

Any advice with this process would be much appreciated.

David




--
Curt Kinchen
ptcurt@gmail.comptcurt@gmail.com



[Non-text portions of this message have been removed]

 



What method do you employ to drill straight for the helicoil?

DAvid

On 08/05/2018 11:25 AM, Richard Ellingworth richardecho@hotmail.com [fairchildclub] wrote:


 


Hi
I have a couple of helicoils in my cam cover, they seem to be fairing well. I made a good fitting gasket plus small amount of good quality gasket sealant on my Ranger and it does the job, been 150 hours without an issue. Use a small ratchet and feel them down.

All the best
Richard
[image1.png]

Sent from my iPhone

On 5 Aug 2018, at 14:54, Curt Kinchen ptcurt@gmail.comptcurt@gmail.com [fairchildclub]
wrote:



You are on the right track. I ran into the same issue a few times. I installed the stud, then tested it with the called out torque for the cover attach nuts per the book. If the stud popped, then I used a helicoil. It's simply a matter of too many years with
the dissimilar metal corrosion potential of the steel stud and magnesium housing. Installing the studs with loctite or, thinking about it, with some corrosion preventative sealant might help prevent further corrosion.


On Sat, Aug 4, 2018 at 7:11 PM, Ranchaero Wing Shop david@ranchaerowingshop.comdavid@ranchaerowingshop.com [fairchildclub]
wrote:


As I mentioned in a previous post, the camshaft housing cover was
leaking oil considerably at the hold down studs. I've removed the cover
with the plan to use Hylomar and silk thread. While removing the cover,
I found that many of the studs are loose, and the gasket seal job looked
a little sloppy around the stud holes. Several of the studs unscrewed
while removing the steel lock nuts holding down the cover. So, I've
started testing each stud using double jammed nuts. When the stud feels
looser than I think it should be, I remove it, clean it, and replace it
using Loctite blue medium strength, turning it down as tight as I dare.
So far so good, but now I'm wondering if I should be using the red
"permanent" grade Loctite instead of blue. What do you Ranger experts do?

Also, it seems to me there should be a procedure for setting the studs
though I can't find it in the overhaul manual. How tight do these studs
need to be? There should be a torque value or some calibrated method for
this process besides just "feel". I'm afraid of over-tightening and
stripping the hole. It appears the person who set these studs also was
worried about over-tightening and left them looser than they need to be.
I see one helicoil type insert already used and damn sure don't want to
go there.

Any advice with this process would be much appreciated.

David




--
Curt Kinchen
ptcurt@gmail.comptcurt@gmail.com




[Non-text portions of this message have been removed]