Stihl 056 Piston

[XD40SW]

Hey,
I’m working on an old 056 at the moment. It had a piston failure, but I think the cylinder is salvageable. The IPL that I have doesn’t show 52mm for the 056, only 54mm & 56mm.

I found an old thread on the subject, and it appears the piston I need is 1115 020 2001.
My only question is... my piston had a “C” stamped into the top of it. What does it mean? Is there more than one 52mm piston? Is the part number I mentioned correct?

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[Wonkydonkey]

My 2c is,,, clean up the cylinder, to see if there are any bad marks, and then look for a piston.
As to the size, you may find that some one has used parts from another saw or just put a top cover from another saw , ie 051 is a 52mm

Edit, I see some of the eBay listings quote the number you say (1115 030 2001) number and say 045/056
@Definitive Dave should know
Cheers
Sean

 

[cus_deluxe]

If its like others, that c stamp is an indication of bore tolerance. A being smallest (pretty sure),C being biggest, but these are very small variations.

 

[XD40SW]

My 2c is,,, clean up the cylinder, to see if there are any bad marks, and then look for a piston.
As to the size, you may find that some one has used parts from another saw or just put a top cover from another saw , ie 051 is a 52mm

Cheers
Sean

Yeah, I plan on trying to clean up and reuse the cylinder. I’ll need a piston though...

I was just reading an old thread on this same topic. I believe some of the early 056’s were 52mm. The saw is serial #112568856.


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[brshephard]

Hey,
I’m working on an old 056 at the moment. It had a piston failure, but I think the cylinder is salvageable. The IPL that I have doesn’t show 52mm for the 056, only 54mm & 56mm.

I found an old thread on the subject, and it appears the piston I need is 1115 020 2001.
My only question is... my piston had a “C” stamped into the top of it. What does it mean? Is there more than one 52mm piston? Is the part number I mentioned correct?

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They have aftermarket:
https://m.ebay.com/itm/STIHL-056-04...119046?hash=item2a5d6e0a06:g:PNUAAOSwGvhT8lFl

NOS OEM:
https://m.ebay.com/itm/NOS-OEM-STIH...556839&hash=item2ab26ea24b:g:H6sAAOSw5kBbTWCQ

Or you could upgrade to a bigger P+C:
https://m.ebay.com/itm/Stihl-056-AV...:6q8AAOSwil5bOnMQ:sc:USPSPriority!59701!US!-1

 

[XD40SW]

I saw that OEM piston on eBay. I was just curious about the letters stamped on them. The one for sale is clearly labeled “B”. Whereas mine is a “C”.

 

[Adirondackstihl]

I saw that OEM piston on eBay. I was just curious about the letters stamped on them. The one for sale is clearly labeled “B”. Whereas mine is a “C”.

Tolerance designation

 

[XD40SW]

Tolerance designation

Thanks. Could you elaborate a little more? Is it safe to run a “B” piston in a “C” cylinder?

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[Adirondackstihl]

I think you’d be fine, but let’s hear from
@jacob j. , our resident sexpert

 

[XD40SW]

I’m curious what the letters mean too. I could see “A” being right on spec, and B/C being under or over. Or something like that.


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[brshephard]

Maybe this would work?
https://www.ebay.com/itm/Stihl-056A...117694?hash=item5d80751e7e:g:gcYAAOSwJnRbffvo

 

[XD40SW]

Maybe this would work?
https://www.ebay.com/itm/Stihl-056A...117694?hash=item5d80751e7e:g:gcYAAOSwJnRbffvo

Thanks for the help looking, but I’m really skeptical of that one. No good pics of the cylinder bore or piston.


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[XD40SW]

Well,
I ordered that OEM “B” piston off eBay. Hopefully it fits...

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[Adirondackstihl]

From memory....

A & B can go together
B & C can go together
But shouldn’t mix A & C

 

[PA Dan]

Well,
I ordered that OEM “B” piston off eBay. Hopefully it fits...

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Did your cylinder clean up? That Ebay listed said it looked unused! I would ask for a cylinder pic! That would be a steal if it was unused!

 

[XD40SW]

Did your cylinder clean up? That Ebay listed said it looked unused! I would ask for a cylinder pic! That would be a steal if it was unused!

I just picked up some muriatic acid. I’m gonna try to clean it up tonight. I think it will. It only has a little bit of transfer on one side of the exhaust port.


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[PA Dan]

I just picked up some muriatic acid. I’m gonna try to clean it up tonight. I think it will. It only has a little bit of transfer on one side of the exhaust port.


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If it only has a little try sand paper and some oil!

 

[jacob j.]

From memory....

A & B can go together
B & C can go together
But shouldn’t mix A & C

I think you're right on the money. The tolerance differences are tiny, but enough that mixing two sizes up or down is a problem.

I know for some of the Poulan saws, they made all the way out to an "E" sized piston and bore, and the E piston wouldn't even fit in an A or B cylinder.

 

[XD40SW]

The cylinder cleaned up very nice. I just got my piston installed, everything was looking good. Then I realized that I forgot to find a base gasket.

When I pulled the cylinder off, the old base gasket stayed pretty much intact, attached to the crankcase. Very little if any was stuck to the cylinder base. I feel pretty good about reusing it for now just to get this project moving.

I have a couple questions for you guys though. I have Motoseal and 518 on hand right now. Which one would you recommend for dressing the existing gasket? The other is, while looking for a base gasket for the 056, I kept stumbling across an aftermarket brand called “Pro-Line”. Is their stuff of usable quality?


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[brshephard]

Have you checked your squish?