loose stud...

[Mark Lutman]

i have an MS 260 and one of the studs that hold the side panel on has been overtightened one too many times,so i can no longer tighten one of the nuts up without the whole stud turning,i can now unscrew and take out the whole stud,any way of fixing this,have tried araldite,but with no luck...

[skyhuck]

Helicoil (sp)

[spudulike]

Stihl do ovesize ones for their plastic bodied saws but don't know about their alloy ones.

 

Engineering options are making a stud with oversize base and retapping the hole, using a steel insert and locking in place with JB weld or a decent high temp bearing retaining compound or a helicoil.

 

Helicoils need less land around the hole, inserts need more but are stronger.

[GardenKit]

Helicoil is the way to go, simple to use and much stronger than the original. All I ever use and reccomended by Stihl technical.

[Al Smith]

One would have to research it but I believe Stihl does offer over sized studs .

 

They would be relatively easy to make providing one had the skill set plus a good lathe .Now as it is most of us in the USA who might have the knowledge lack the lathe capable of cutting metric threads as is my case .

 

On that side track there's an art to cutting threads on a lathe which some can and many cannot .In the classes of thread fits ,a class one is tight fit .Properly cut this class of threads if properly torqued acts almost like a locking thread and irregardless of thread locker compound or not will not loosen up .

[Mark Lutman]

ok helicoils it is,cheers gents!

[spudulike]

If you get stuck - PM Burrell (Martin) he builds steam trains as a hobby and I have seen his work - excellent doesn't even cover it.

 

He would make a special but buy him some beer if you ask him - he is a generous fella!

[Mark Lutman]

ok,does anyone know the size i would need,or how i find out the size that i need?

[spudulike]

Typically in the simplest form, you get a die set and see what die screws on to the stud or if you have nuts around that size, see what screws on to the stud and then do the same with a tap - see which one screws in to the nut.

 

If you don't have a tap and die set you will not be able to use a helicoil unless yo purchase the correct tap for the helicoil/insert.

 

The threads are designated M and then a number, the M I believe to be metric and the next number is the diameter of the stud including thread.

 

So M5 is Metric 5mm. The number after this is the pitch of the thread so M5 1.5 is 1.5 threads per mm and you will see this as M5 1.5.

 

I don't have a 026 stud out and don't really want to remove one.

 

To do the job you will need to identify the diameter of the stud, the pitch of the thread (may be able the amount of threads in 10mm and divide by 10 to get the pitch), buy the helicoil for this thread and then you will need to purchase the drill and tap that allows you to drill and tap the hole the helicoil needs to fit in to.

 

I always degrease the newly threaded hole and the helicoil and put it in with a little bearing lock to make the repair good.

 

It isn't a particularly easy job for someone that hasn't done thisw sort of work before.

 

The oil tank will need a good flush out after the repair to get rid of the debris!

 

Good luck

[Mark Lutman]

nice one mate,might ask about in a couple of local shops and get a price,might be worth it to save the hassle! thanks