A Stihl 024 that i Converted to a 026

[a. palmer jr.]

I don't like to get into this kinda thing. I have an 024 but I think I'll keep it stock because some day someone else will own it and have to figure out how to rebuild it. I did experiment with an 034, changed it to an 036 and got into changing more than the P/C, had to buy the plastic in order to use compression release of the 036. I could have plugged the hole in the cylinder but thought I might use the comp. release. I'll probably etch "036" on top of the cylinder to let the next owner know.

 

[stihl saws]

Unless you do have an 024 super case you need an 026 case to go with the crank.
I'm still interested how the op got around this.

Me too. Mines just a standard 024.

 

[drf256]

I have a feeling the OP wont be back anytime soon.

I'll post my findings when I can as well.

 

[dall]

id say al is right

 

[stihl saws]

I have a feeling the OP wont be back anytime soon.

I'll post my findings when I can as well.

That's my thoughts, also. Can't wait to see what you figure out.

 

[huskihl]

Crickets......

 

[Tpagel]

Pics of 024 case with a 026 crank in it.
I do not have an 026 case for comparison. But when side by side you can see the difference in the angle.

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[stihl saws]

This may be a stupid question, but here's what I'm working on. The saw on the left, I'm confident is a standard 024. Number on the rod is 1114. The one on the right, I bought as a 026, had no cylinder/piston with it, rod # 1121. On my scientific folding table the cranks line up perfect. If the crank case centerlines are different, how do I know if it's a true 026 case. Maybe I'm not understanding something?

 

[Tpagel]

My post was just show what that the 026 crank is not to be a direct substitute to the shorter 024 crank.
The geometry is different in the case. The 026 crank rides too high in an 024 case on the saws I was working on.
I am curious what others found.
I am by no means an authority on saws.


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[stihl saws]

My post was just show what that the 026 crank is not to be a direct substitute to the shorter 024 crank.
The geometry is different in the case. The 026 crank rides too high in an 024 case on the saws I was working on.
I am curious what others found.
I am by no means an authority on saws.


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I've never worked on a 024 myself. Lot's of 026's though. I'm just wondering what saw I'm working on now and if it will work. I don't know the history of the supposed 026. It just has me a little worried. I'll just put the new cylinder on tomorrow and see what happens.

 

[drf256]

Interested to see what you find out. Unfortunately, I don't presently have the time to experiment right now, I will in the fall though.

If one could look at the 024 vs 024S piston on a website for a manufacturer, the answer should be there.

The jug is exactly the same in the 024/024S to the best of my knowledge. So if they lowered the crank in the case 1mm to account for the 2mm difference in stroke, the compression height of the Pistons should be the same. The overall height should not be as the Pistons are supposedly different. The skirts should differ in length.

 

[Brush Ape]

That's why it wasn't running right. Flower pot for a piston. mmm never gonna work.

 

[stihl saws]

That's why it wasn't running right. Flower pot for a piston. mmm never gonna work.

If that were mine, I'd say I used the pot for a bolt holder and lost them all. I worked late and didn't get a chance to work on what I hope is a 026 today. Maybe tomorrow.

 

[jake wells]

just a 026 with a 024 cover.

 

[Tpagel]

The flower pot may be good for something, organic chainsaw cylinder? already has a spark plug hole in top.

just a 026 with a 024 cover.

Easy to tell if this is the case, 026 cylinder would need the fins on top ground off to fit the 024 cover they are much lower on the cylinder.

 

[Al Smith]

It's all perception I guess .I can't figure why you would convert an 024,which is a nice little saw when 026's are so plentiful .Nor for that matter convert an 038 AV to an 038 Mag .They made a million Mags already and they are not hard to find .

 

[stihl saws]

Interested to see what you find out. Unfortunately, I don't presently have the time to experiment right now, I will in the fall though.

If one could look at the 024 vs 024S piston on a website for a manufacturer, the answer should be there.

The jug is exactly the same in the 024/024S to the best of my knowledge. So if they lowered the crank in the case 1mm to account for the 2mm difference in stroke, the compression height of the Pistons should be the same. The overall height should not be as the Pistons are supposedly different. The skirts should differ in length.

Just for comparison. Here are a standard 024 vs 44mm 026. 024 is more domed and the skirts are about 1mm longer.

 

[stihl saws]

It's all perception I guess .I can't figure why you would convert an 024,which is a nice little saw when 026's are so plentiful .Nor for that matter convert an 038 AV to an 038 Mag .They made a million Mags already and they are not hard to find .

I'm just going to leave the 024 alone. The cylinder is good and I think the cranks fine, so really no need to mess with it. I've already got four 026's to play with.

 

[drf256]

Just for comparison. Here are a standard 024 vs 44mm 026. 024 is more domed and the skirts are about 1mm longer.
View attachment 27096 View attachment 27097

Pretty sure this proves that the distance from the tip of the connecting rod at TDC to the squish band "should" be exactly the same on the 024/024S/026.

They must have set the crank lower in the case when they went to the 32mm stroke.

 

[stihl saws]

Ok, I just checked ipl's for the 026, 024, and the super. They share the same cases (1121 020 2117). Which would make sense, it would be an expensive change to make with casting molds and such. The 026 and the 024 super share the same crank (1121 030 0405). I'm thinking Tpagel may just have a weird combo of parts that just can't work together. It would be easy to do given how much they all look the same with just mm's of difference.
My disclaimer: I am not a internet chainsaw guru, nor a keyboard warrior. Just trying to help.