Help Stihl MS460 not starting

[spudulike]

That is strange, the circlip looks like a Stihl one and they never fail. It is most likely that it was either not fitted correctly or damaged on fitting. I usually fit them then rotate so the open part faces the top of the piston and then inspect with a magnifying glass to ensure all is 100%. 

Very east to think it is fitted correctly but the thing isn't sitting in the groove correctly.

[adw]

As much as it pains me to say this, but I use the Stihl service tools to refit the tailless circlips on 550/560 etc, vert easy and works every time.

[Trailoftears]

I'm glad its all sorted.Just out of curiosity,why are some circlips tanged and some not? Is it just to help with fitment problems?

[adw]

On a positive much safer and less chance of them coming out, on a negative more difficult to refit.

[spudulike]

33 minutes ago, Trailoftears said:

I'm glad its all sorted.Just out of curiosity,why are some circlips tanged and some not? Is it just to help with fitment problems?

The tanged ones are easier to fit and remove but the danger is that the tang may wear in time and break.

Most of the aftermarket circlips are decidedly iffy at best. Compared to OEM ones, the OEM ones are much harder and springier than the aftermarket ones that can be easily deformed if care isn't taken.

[skc101fc]

Very easy to overstretch a non genuine circlip , beyond its "springiness". If I have to use them I try to wind them in rather than forcing them into a too tight circle,  if that makes sense 

[Muddy42]

Yes my guess is that I messed up the clip on installation 2.5 years ago.

 

[openspaceman]

11 hours ago, Muddy42 said:

Yes my guess is that I messed up the clip on installation 2.5 years ago.

 

I wonder if the orientation of the tang makes a difference, my thought is if it is vertical it suffers a bit less bending stress than horizontal so could fatigue would be less.

[adw]

1 hour ago, openspaceman said:

I wonder if the orientation of the tang makes a difference, my thought is if it is vertical it suffers a bit less bending stress than horizontal so could fatigue would be less.

I was always taught tails to the bottom was good working practice.

[Muddy42]

14 hours ago, adw said:

I was always taught tails to the bottom was good working practice.

I just put the gap in the Stihl OEM circlips to the top (on the same saw this thread refers to). I always though that was the right way to do it.

 

But surely the main thing is that the clips are in properly and not stressed or bent.

Edited April 10 by Muddy42