Stihl ms362c pistons

[Frankavich84]

Is there something I need to know about these? I get more if these in to repair than anything else. Mostly with pistons that look like this. And eventually it takes a ring out and ultimately the cylinder. Bad news is I can’t fix it with a simple piston replace so I’ve got about 4 of them in my shop to repair right now. What I can I tell the guys to avoid this? I don’t mind the money but it is giving Stihl a bad wrap.

Sent from my iPhone using Tapatalk

 

[huskihl]

Did a circlip come out?

 

[Frankavich84]

No both were still in and have been on the saws.


Sent from my iPhone using Tapatalk

 

[huskihl]

No both were still in and have been on the saws.


Sent from my iPhone using Tapatalk

Did a chunk of a bearing or a carb screw get sucked up into it?

 

[Frankavich84]

I couldn’t find anything but the chunk of piston, chunk of cylinder and possibly ring. This thing came in running just a “lack of power” hard to believe the guy has a few other saws and uses the opitx2 or whatever hard to believe it is fuel but possibly.


Sent from my iPhone using Tapatalk

 

[huskihl]

Idk. Looks like something has been trying to come up through both transfers

 

[huskyboy]

Did the top ring pin come out?

 

[Basher]

Bearing cages disintegrating? Something in the bottom end has come up through the transfers to start this mess.

 

[Cobby08]

What ratio is he running it at?

 

[67L36Driver]

I’m not familiar with the 362 but, Stihl saws using twist lock AF covers can loose the pin or break off the end of the stem.

 

[Frankavich84]

I’m going to split the case and look at the bearings closer. 50/1 on fuel. It’s a 362 which has the 1/4 turn lock on filter so nothing came from the intake. It’s got to be the piston pin or the cages of the bearing coming apart but I can’t find them. I guess if it was running maybe it all got blown out the muffler... seems unlikely that all of it is gone.

Needless to say if anyone has 362 piston and cylinders in good used condition contact me. I’m sure I’ll need them if this continues.


Sent from my iPhone using Tapatalk

 

[huskyboy]

What did his bar and chain look like?

 

[pwheel]

Bearing cages disintegrating? Something in the bottom end has come up through the transfers to start this mess.

Main bearing failure, by the looks of the circular pock marks on the piston dome. I heard of some 362 bottom end issues locally several years ago, but nothing since. Maybe sustained high revs are something that this model doesn't handle well.

 

[Frankavich84]

What did his bar and chain look like?

Fine for what it was forester cheap laminated bar. He uses it for firewood so it sees good work but brought in 4 saws 2 362c 1 362 and 1 361. Says they last 1.5-2 years tops for him. I’m about to sell him a 036 and say see you in 5


Sent from my iPhone using Tapatalk

 

[huskyboy]

So he doesn’t run dull chain and they cut alright?

 

[Frankavich84]

When it came to me the chain was fairly sharp and the edges weren’t all burnt out on the bar. First time meeting the guy but he is one of my best customers “friend” so... saws were all clean and not junked up. Filter was fairly clean not perfect but acceptable to me.


Sent from my iPhone using Tapatalk

 

[Cobby08]

I'm not faulting the guy but that doesn't seem long for firewood use only. If it was JUST 362's I'd say maybe but if its been that way on 2 (3 kinda) different models I would say operation or oil issue causing premature wear.

 

[Frankavich84]

I'm not faulting the guy but that doesn't seem long for firewood use only. If it was JUST 362's I'd say maybe but if its been that way on 2 (3 kinda) different models I would say operation or oil issue causing premature wear.

Oh sorry it isn’t homeowner firewood use I should clarify. He does firewood to sell in bulk. So they see good use. I guess I was meaning they aren’t riding around in a truck getting the crap beat out of them and random users each day. It is just him. I’ll be the first to say most issues are operator. However this makes 3 separate outfits I do repairs for and the same issues on the 362/362c. Just hoping someone can point me to how to fix them so it doesn’t happen again. Whether that is direct them to a different saw or some change in the current saw.


Sent from my iPhone using Tapatalk

 

[Basher]

Main bearing failure, by the looks of the circular pock marks on the piston dome. I heard of some 362 bottom end issues locally several years ago, but nothing since. Maybe sustained high revs are something that this model doesn't handle well.

That`s what it looks like to me but I don`t have the saw here to test or work on so we need the OP to take a look and let us know what he can find. There has been a rash of main bearing cages breaking up lately, I blame this on not enough oil getting to the bearings.

 

[Frankavich84]

That`s what it looks like to me but I don`t have the saw here to test or work on so we need the OP to take a look and let us know what he can find. There has been a rash of main bearing cages breaking up lately, I blame this on not enough oil getting to the bearings.

I’ll break it down and show pictures of the bearings. If possible I’ll replace the proprietary bearing with new and the general bearing with a metal caged slacker bearing. Hopefully that will make it last longer this go around.


Sent from my iPhone using Tapatalk