Chainsaw Repair
Husqvarna - Stihl - Poulan - Jonsered - Dolmar chainsaws and more => Stihl => Topic started by: Al Smith on June 15, 2012, 10:03:04 pm
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I picked up an 024 on the cheap today .It runs they say,piston is little rough ,has good compression etc .I've saved worse looking .
Now the big question which I don't know is will an 026 cylinder bolt on the this little pup ? I've never worked on one so I have no idea .
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Al I think it was a 024 super that the 026 was a bolt on. Specs below.
024 42mm bore 30mm stroke 41.6cc
024 Super 42mm bore 32mm stroke 44.3cc 024AVS
026 44mm bore 32mm stroke 48.7cc
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More info when I was looking at a 024AV myself and input from others. http://chainsawrepair.createaforum.com/stihl/stihl-024/
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I'm going to have to investigate the little thing I guess .I have no idea what the stroke is on that thing .
Norwood shows an aftemarket bolt on for an 026 with an odd ball 44.7 mm bore which should bring it up to about 50 cc more or less .
On the other hand it might be such a deal as taking an 038 av up to 38 Mag specs with all that carving and twittering to get the cylinder to fit .Might just as well start out with another saw than try to make a silk purse from a sow's ear .
I'll get the little pup running good ,that's not going to be a problem at all .How well remains to be seen . ;D
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026
48.7 cm3 (2.97 cu.in)
44 mm (1.73 in) Bore
32 mm (1.26 in) Stroke
2.6 kW (3.5 bhp)
at 7,000 rpm
024 Super
44.3 cm3 (2.70 cu.in)
42 mm (1.65 in) Bore
32 mm (1.26 in) Stroke
2.3 kW (3.1 bhp)
at 7,000 rpm
024
42 cm3 (2.56 cu.in)
42 mm (1.65 in) Bore
30 mm (1.18 in) Stroke
2.1 kW (2.85 bhp)
at 7,000 rpm
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MS 240 MS 260
41.6 cc 50.2 cc
42 mm 44.7 mm Bore
30 mm 32 mm Stroke
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Your max kW (hp) rpm specs are way off, otherwise you are right. ;D
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That is from an old Stihl workshop manual. I never put much faith in those HP or KW figures anyway. Those were supposedly measured at 7000 rpm? I always figure that the numbers are just something they pulled out of the air?
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Well according to the specs as per Stihl micro fitche they give max torque at 7,000 on that series of saws .I'm thinking like the 024 they set max RPMs at 12 thou and on the 026 13 thou maybe .Of course that doesn't mean much if you doctor with the porting .
Itty bitty little engine like that it wouldn't take much to crank it on a 15 if you wanted it to .
Might sound hard to believe but a few years back according to some a pair of 024's showed up a GTG and ran an astouding 22 thou and held together .They didn't say for how long though. ;)
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Well good grief now I feel about half stupid .All this deal with this little saw was simpley to get a 3 cuber I could play with at the GTG's and all along I have an 028 in the shed .All this time I thought it was over the 3 cube limit .Then I did some research and find it's 47 cc's . :D
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Copy and paste ;)
The 026 P&C will bolt on 024. There are 2 cranks in 024. One has non caged rod brg. (old AV model I think). Late model has caged rod brg. (AV Wood Boss) it's good to go for 026. One prob. converting is 024 cylinder cover won't work. 024 cyl is shorter ( has flat top) 026 cyl. has vertical cooling fins on top of cyl. (taller). I converted one a couple of years ago. I changed the 024 cyl cover, AF cover and AF to 026. 026 has a bigger AF. There are two different 026 AF style depends on fuel tank vent. You'll probably need the old style 026 AF.
Al just do a little "Al magic" to the 024 and she would be OK as an 024. I wouldn't do it again unless I had a bunch of 026 parts. I wound up with way too many dollars in it. After buying all the stuff I needed to convert. I'd do a WP one the 024 cyl. and call it good.
Shep
Al, I did a reply on the other site (Competition Saws) with what I knew about 024's. Too much to retype.
http://competitionsaws.createaforum.com/stock-appearing/024-ideas/msg1050/#new
Shep
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Yeah after thinking it over I'll just use it for a light duty saw and call it a day .For the 50 bucks I have in it I certainly didn't hurt myself by buying it .
Usually for a lot of limbing I either use an old s-25 Poulan or one of the 200T's .This I think might work better .
My guess is they have it tuned lean .A seal out would have cooked it like a turkey which it isn't .Probabley some 3M green abrasive and kerosine will polish it up nicely and a set of seals just to be on the safe side .After market seals for that thing are only about 5 bucks a pop from Norwood .
I would have got on it except at the moment I'm dodging rain drops and fighting with a new screen door which seems to be winning at the moment .
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I have a 026 PRO with a flat top cover (1999) that has a PRO cylinder with the later high fins filed off so the cover would fit.
The PRO cylinder had a compression release whereas the others were not drilled and tapped for the CR.
It is nice for limbing
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Well good grief now I feel about half stupid .All this deal with this little saw was simpley to get a 3 cuber I could play with at the GTG's and all along I have an 028 in the shed .All this time I thought it was over the 3 cube limit .Then I did some research and find it's 47 cc's . :D
Which 028 do you have Al?
Per Acres site so info could be hit or miss :P
028AV = 42mmx31mm 43cc http://www.acresinternet.com/cscc.nsf/ed1d619968136da688256af40002b8f7/5f352eae1aecdc9288256ba20048eb6b?OpenDocument
028AV type 2 = 44mmx31mm 47cc http://www.acresinternet.com/cscc.nsf/ed1d619968136da688256af40002b8f7/be0d5cdb019bd35e88256ba200493999?OpenDocument
028 woodboss = 47cc http://www.acresinternet.com/cscc.nsf/ed1d619968136da688256af40002b8f7/83971384aaeecdb288256ded0075d27f?OpenDocument
028 SUPER = 46mmx31mm 52cc
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I'm not sure but I think it says farm boss whatever that is .I'll trot out to the shed and find out .
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52cc one that is super will be in red or black. This one had 028AV Super woodboss.
(http://i59.photobucket.com/albums/g289/doemaster789/Partner550/550028super003.jpg)
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It's a wood boss so it will fit in the 3 cube . ;D
I forgot exactly how it went ,but it was a pile of parts in boxes ,lots of them .
Tom my little bud in the tree biz experianced some theft losses and ran out of saws to conduct business .Early it the season and he was broke as a church mouse .
I revived the 028 plus the 034/036 you ended up with plus a 700 Mac .In addition my souped up 038 Mag and one of the 200T's got him through until some money came rolling in .
In addition to those mentioned was another 038 Mag I'd nurse maided for ten years plus a 281 Huskie which are now both mine . ;D
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A little up date on this little thing .My curiosity got the best of me so about a half hour ago I fired it up .No muffler because the dealer pulled it to examine the cylinder .Well it idled with no muffler so that tells me the carb is not set lean .
I made a cut with it and considering it had a well worn guard chain it did pretty good . So this is my conclusion . I imagine someone sent the saw to the shop for a chain grind and tune up .They found a slightly abraided cylinder and advised the owner who bought a new saw .
Due to the fact it has one of those long tie strap type guard chains and the chain was machine ground it did not come from a more professional user .Those chains cut terrible when new and worse as the cutters wear down .
I'd imagine given the choice of a rebuild that with new parts and labor at 65 bucks an hour would equal what the saw cost new the guy opted to buy a new one .It isn't neccessarily the dealer steered him wrong because it could have died on the vine given enough time .
I think I'm just going to peel it down to the bones and buff it up and use it as it is without too much soup .For a little pup it doesn't do bad at all .First thing to go is that freakin guard chain .
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stihl 024 IPL showing 3/8 rim page 11 http://www.keepandshare.com/doc/2059371/024-pl-pdf-july-11-2010-12-52-pm-476k?dn=y&dnad=y
0000 642 1231 1 Rim sprocket 3/8" 7T (B)
1121 007 1035 1 Rim sprocket kit 3/8" 7T (B)
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That's probabley a little later publication than my copy in the big orange book .
What amuses me about some of those smaller Stihl saws is running lo pro 3/8" chain .That stuff is for bumble bee saws .
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We had a bunch of storm damage and today really was the first chance I had to run this little thing .Whoever ground that chain should find another line of work .The dummys ground it like it was 3/8" low .After I hit it with a 3/16 " file that little rascal really impressed me .That thing has a lot more azz than I thought it would have . I think I got a keeper . ;D
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Hope you don't mind me jumping in on your thread. I have an 024 and am trying to remove the plastic cover over the cylinder/spark plug. There is a single through-threaded screw with slots for a screwdriver at the top with a rubber grommet. I can't get the screw loose. I've had the saw for 15 years, 2 bars and 4 chains and never removed the shroud before. It it just a matter of manning up and getting tough with it or is there some technique you can share?
And is there a manual on line?
leo in st. louis
toller@aol.com
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Spray some PB blaster on the thread area from the top. http://www.toolsource.com/blaster-penetrating-catalyst-pi-91999.html
Let set for awhile and get a big screwdriver that takes up most of the slot.
What manuals you looking for IPL, Owners, Service?
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Yeah it just unscrews ---or should .
I'll give anybody a word of advice though which I just learned .These little rascals have such a tiny air filter you have to pay attention to them .It certainly isn't like the 038 Mag you can run all day without shaking the dust out .
Ran just dandy then took a fit on me .What is this ,fiddled with the carb,no go .Finally shook the dust out then back in business .A learning curve I guess .
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i'm thinking 028 SUPER top end on a 026 case ,pop up piston hmmmm................
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I suppose anything is possible. However the 028 is "old school " design. It's the little brother to the 048-042- 038 series . So I doubt the cylinder would be a direct bolt on thing .
You know it probably is about the same as a few that bolted 038 Mag cylinders on an 038 Av .You have to do some machine work for it to work .You'd just as well start off with the Mag to begin with rather than hill billy engineer one .
On the other hand if you have a pile of parts sitting around it might not be a bad project just to see if it would work .
As far as the 028 somebody had a screamer over in Pa. a few years back so they will run with some attention .On that I have one in the shed I'll do exactly that once I feel the ambition which has been rather lax here of late .
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maybe the 034 cyl on the 026 would be a better build :-\
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The 034 cylinder is 2 MM over bore of the 026 and it's highly unlikely to be a direct bolt on deal .Even if with some machining work the problem would be if a person were trying to keep the displacement within 3 cu inchs it would run you over slightly .
If I read it correctly the 026 uses a 2 mm shorter stroke than the 034 so there you'd run into problems with the rod length as well regarding piston /port timing issues .Depending also on the amount of skirt below the pin you might catch it with the crankshaft throws . Then too once if you do get it to work would the shrouding fit ? A lot to think about here .
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I had some time today in between moving logs and waiting for the rain to pass so I played with this thing .
Cut what I could from the baffle cage and removed the front baffle from the muffler front and retuned .The front opening was already large enough with the front baffle removed .No need for a second .
My my it certainly awakened a tiny little sleeping giant I must say .I was a tad sceptical about this thing which for all intents is the smallest displacement next to the 020/200T of the so called professional Stihl saws I do believe .My sceptisism was unfounded because this little mouse has the heart of a lion now .
Took that little rascal non stop though 20 inch oak for 15 minute and it never hiccuped ,farted or protested .Got me a keeper I do believe . ;D