Broken Threading, oil plate screw (stihl ms260) help needed!

[MartDalb]

Hi all!


I need some help with an old Stihl MS260.

I got it for near free and it's used but working, after some cleanup/carb replacement etc.


Anyho, my problem is that the threading in the hole for the oil plate, see picture 2, has been wrecked inside.
This means that the plate is loose, and the M4*8 screw holding the plate simply doesnt work in the hole anymore.


I have made an M4*11 screw, that does hold the plate, probably because the threading in the end isn't too worn out/broken yet.


But, will this solution last? Or is there a better workaround here?



Thanks for all help!

 

[Ronie]

I would tap it for an m5 screw.

 

[MartDalb]

Could you elaborate? Any method to do it would help alot.

Thanks

 

[Ronie]

Could you elaborate? Any method to do it would help alot.

Thanks

Here's a video.

 

[Ronie]

If you think the m4 screw has enough threads catching, you could put some thread locker on it and if it doesn't hold tap it for the next size up.

 

[MartDalb]

ah! that makes sense!
I was unfamiliar with the word "tap", I'm from Euro

Thanks for the help!

 

[TheTone]

If you think the m4 screw has enough threads catching, you could put some thread locker on it and if it doesn't hold tap it for the next size up.

+1 Try the easy solution first.

 

[HarleyT]

I was unfamiliar with the word "tap", I'm from Euro

 

[Vintage Engine Repairs]

Yes tap to m5 by .8

that screw should have been m4 by .7

don’t go too deep, it may go into something you don’t want it to hehe

Measure the current depth, then transfer that depth to a 4.2mm drill bit (4mm will work perfectly fine) and then drill away. Tap m5/.8 and voila

 

[atpchas]

Be aware that a larger screw will likely have a larger head that may interfere with the bar seating properly. The excess diameter can be ground off but it's one more step in the repair.

 

[av8or3]

That little screw holds the guide plate on while the bar is off. If the screw fell out, the saw would run fine without it.

 

[Haironyourchest]

As above, you don't really need a screw at all. My Husq 254xp oil plate has no screws, or screw holes, by design. The bar nut studs keep it from falling off anyway, unless I turn the saw sideways and shake it.