thompson1600
ArboristSite Guru
I have an 028 crankcase. I don't know which version it is. Can anyone tell me a way to measure the cylinder bolts or some other way to tell whether it is an AV case or a Super case. Thanks
Tom
Tom
Stihl 028 crankcase question
- Thread starter thompson1600
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TonyM
ArboristSite Guru
I Believe they are the same, with the exception I've seen 028AVs with 3 screws on the recoil cover, and an 028 Super with 4. Are the crank and bearings okay, because if so, I'm interested in buying it if you want to part with it.
From my understanding an 028 Super Piston and cylinder will fit on a 028 woodboss crankcase. But dont take it as the gospel. I hadnt heard of the 3 & 4 screw hole theory with the recoil before. But learning is a good thing.
Curt
Curt
Tony M., you have taught me something 
. I have checked the screw hole theory and it seems to be accurate. Thanks for the info. Never noticed it before.
Curt
. I have checked the screw hole theory and it seems to be accurate. Thanks for the info. Never noticed it before.Curt
tony marks
Addicted to ArboristSite
just wondering how they can be the same if the displacement is 4 cc difference..what am i not understanding about the subject.. other than most everything..
TonyM
ArboristSite Guru
It was accidental that I discovered it. I had two 028's in the shop, a parts 028 Super, and an 028AV. The recoil spring broke on the AV, so I thought, no big deal, I'll swap the entire recoil. That's when I realized the difference.
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Picked up an 028AV Wood Boss the other day and it had 4 screw holes on it. Not sure on what the deal is there. But it was original. Thought we had something going there...lol.
Curt
Curt
TonyM
ArboristSite Guru
I just put together an 028 Super using an 028 Woodboss crankcase. The Woodboss recoil uses the four screws. It is the plain 028AV that uses three on the recoil. Also discovered some minor differences in the bar tensioner on the 028 woodboss. Looks like the crankcase is designed to uses the side chain tensioner, but then it actually uses a standard behind the bar tensioner that is different from the 028 Super and 028AV tensioner. As a result, the screw the holds the inner wear plate on has been slightly moved, and the little projection on the clutch/brake plastic cover has to be trimmed off (not the sprocket cover, but the inner plastic cover that covers the clutch/oil pump/and chain brake.) Just though I'd throw that out there incase this question comes up again. At least now it's documented.
Excellent information Tony M. Thanks.
Curt
Curt
