Stihl 028 wood boss

[Kidneycutter]

i bought this saw spares/repair. Base gasket seems to have perished but I cant remove the cylinder as my t27 has too big a shank to get the right angle. (ordered a t handle torx). Anyway I wanted to buy the rings and gasket but it appears there are different size piston rings for this model 44mm and 46mm I’m guessing the wood boss ans av super are different sizes?
does anybody know what size I need?

 

[64poncho]

Looking at the 028 specs. It shows the 028 uses the 44mm piston. The 028S uses the 46 mm piston.
Also the workshop manual has a NOTE: Older machines ( up to serial No. 6 111 990) had a 42mm piston.
Hope this helps.

 

[Mad Professor]

i bought this saw spares/repair. Base gasket seems to have perished but I cant remove the cylinder as my t27 has too big a shank to get the right angle. (ordered a t handle torx). Anyway I wanted to buy the rings and gasket but it appears there are different size piston rings for this model 44mm and 46mm I’m guessing the wood boss ans av super are different sizes?
does anybody know what size I need?

Best to measure as 028 has been around so long a lot of Frankensaws with parts from various vintages. There was a 42mm piston too.

You could try to measure bore through the ex port. But easy to mistake a 2mm difference.

Another way to tell a Super 46mm, is the piston is domed, the 42-44mm are flat.

A handy tool to have is a scrench, that has a T27 torx rather than flat tip screwdriver tip. I carry both type screnches when I'm out cutting.

For shop I think a Whia (sp?) or Snapon tools work good

 

[Kidneycutter]

Best to measure as 028 has been around so long a lot of Frankensaws with parts from various vintages. There was a 42mm piston too.

You could try to measure bore through the ex port. But easy to mistake a 2mm difference.

Another way to tell a Super 46mm, is the piston is domed, the 42-44mm are flat.

A handy tool to have is a scrench, that has a T27 torx rather than flat tip screwdriver tip. I carry both type screnches when I'm out cutting.

For shop I think a Whia (sp?) or Snapon tools work good

View attachment 919201

Yeah I’ve got a torx 27 scrench but the shank is too thick to locate the screw head. Anyway I think I’ll wait for the right tool then measure and order.
never had this problem had plenty of pots off in the past I think the holes in the cylinder fins are not quite aligned with the cylinder bolt hole. a thinner shank should help get the right angle otherwise ill Have to get the file out.
thanks for replies ….I hope it’s 44mm…

 

[Mad Professor]

Yeah I’ve got a torx 27 scrench but the shank is too thick to locate the screw head. Anyway I think I’ll wait for the right tool then measure and order.
never had this problem had plenty of pots off in the past I think the holes in the cylinder fins are not quite aligned with the cylinder bolt hole. a thinner shank should help get the right angle otherwise ill Have to get the file out.
thanks for replies ….I hope it’s 44mm…

I've taken a saw file to open up the holes in the fins on my 038S ----> 038M conversions. Best done when jug is off.

Check to that the screw heads are not just full of sawdust crap. Thin piece of stiff wire works good for that

 

[farmer steve]

Yeah I’ve got a torx 27 scrench but the shank is too thick to locate the screw head. Anyway I think I’ll wait for the right tool then measure and order.
never had this problem had plenty of pots off in the past I think the holes in the cylinder fins are not quite aligned with the cylinder bolt hole. a thinner shank should help get the right angle otherwise ill Have to get the file out.
thanks for replies ….I hope it’s 44mm…

Had the same problem with a couple older stihls we worked on. Bought one from my Stihl dealer that fits my drill. Thinner diameter. $6 or 7.

 

[HarleyT]

Lotsa variations. Disassemble it first and make sure what you need. I seem to even remember a 1 ring piston once.

 

[Mad Professor]

Yeah I’ve got a torx 27 scrench but the shank is too thick to locate the screw head. Anyway I think I’ll wait for the right tool then measure and order.
never had this problem had plenty of pots off in the past I think the holes in the cylinder fins are not quite aligned with the cylinder bolt hole. a thinner shank should help get the right angle otherwise ill Have to get the file out.
thanks for replies ….I hope it’s 44mm…

If you can see a piston dome through the ex port it's 46mm for sure.

Concerning tools, on new saws does Stihl still give you a basic tool kit? Way back when , when I purchased my 066 they gave a kit with: Scrench, basic T27 driver, 2 screwdrivers, in a plastic pouch.

 

[HarleyT]

They had some nice WIHA drivers, that were black and had the Stihl logo.

 

[cscltd]

If it uses t27 torx for cyl bolts then more than likely not a 42mm as the old ones uses Allen head bolts(unless Frankensteind)

 

[Kidneycutter]

All good advice. However, bad news. it’s a farmertec pot and piston! I think I’ve been had twice as the the 038 I also bought looks like it’s got a cheap piston and pot too.

 

[Kidneycutter]

Can I put a 46mm piston and pot on the wood boss?

 

[Mad Professor]

Can I put a 46mm piston and pot on the wood boss?

yes, get OEM

 

[Clyde85]

Are OEM cylinders still available?

 

[Mad Professor]

Are OEM cylinders still available?

I don't have current price list, 2019 does not show P/C assy but does 46mm piston ($97!!!).

Meteor has P/C, pistons, rings. Might want to find good used OEM cyl and get meteor piston.

Note that the pistons are sized. OEM cylinders are marked A B C for size. I'd measure cylinder and go for ~0.0025" skirt clearance

 

[HarleyT]

Didn't I send you the current price list?

 

[Mad Professor]

Didn't I send you the current price list?

All I got were older ones (2019). Thanks for new one is that 2021? txt format make's it hard to find right stuff.

Regardless thanks!

Seems same as 2019, no P/C and pi$ton cost$ more!!!

 

[HarleyT]

Yeah, they switched over to their new parts lookup, so the prices are integrated in that.

 

[Clyde85]

Thanks guys I have two of them here that I just picked up the other day. Both need top ends.

 

[Clyde85]

What do you guys think of this cylinder? This is after I have polished wit scotch Brite.