My cousins Stihl 029 Question

[Jeff Lary]

Up date

We put the 029 together today the piston just fell in when I pushed in on the rings at the transfer points no problem there. We had to put her together a couple of times as we would discover this had to go on before that but we got her. Choked it 6-8 pulls then she fired right up run fine done a little adjustment of the carb but maybe 1/8 in on high speed jet same on low end adj Idle .Then we cut a few cookies he said before when you enguage the bucking dogs and " put the pressure to her she would die out some" He did it again infront of me I think he was just feeding her too much at once ( bearing down too hard) I told him so but he said "well my 26 will cut good with me about standing on it" So we ran it some more and he decided that maybe I should open up his muffler a little.We put in on the bench and took off the muffler and I walked to the drill press and I heard him say well I'll be dammed ! I turned around and he was looking in the exhaust port at the piston. He said shes scared up already ! so I went over and yep there is a narrow maybe 1mm scratch about dead center of the exhaust port on the new piston. It is small but when you feel it with your finger nail you can feel it just barely.So now he does not know what he wants to do He is thinking of just running her for as long as she will go maybe it will get worse maybe it wont but right now he does not have enough money to buy new. He saw a new pro 62cc stihl that he really wants but for now I guess he is planning on running it for a day then re-checking the scratch? It is our theroy that where the jug had sooo much transfer on it that maybe he didnt get all of it off.Nethier one of us have perfect vision but it did llok good to him and he is the one who knew where the transfer was in the beginning.
I feel really bad I know he needs his saw and he has no money.I am as sure as I can be that I did not do anything wrong on the rebuild. We pulled the plug 3 diffrent times and it was a kind of brownish tan not white/tan.That just leaves the cyl still having a small spot of transfer on the exhaust side some place the we did not see? Thanks to all of you that helped me with questions on this 029 rebuild,... we did piston,grudion pin,circile clips, seals, piston, gas line, Impluse line, fuel filter. The only thing we had left over was one of those a/v plugs?Thanks fo your opinion. Jeff

 

[7sleeper]

That scratch should impair you in any way! Much to small to cause a power loss. But what is really a shame is not going to a 390 kit for a real upgrade.

edit. did you replace the cylinder as well or only the piston?

good luck,

7

 

[tomdcoker]

We put the 029 together today the piston just fell in when I pushed in on the rings at the transfer points no problem there. We had to put her together a couple of times as we would discover this had to go on before that but we got her. Choked it 6-8 pulls then she fired right up run fine done a little adjustment of the carb but maybe 1/8 in on high speed jet same on low end adj Idle .Then we cut a few cookies he said before when you enguage the bucking dogs and " put the pressure to her she would die out some" He did it again infront of me I think he was just feeding her too much at once ( bearing down too hard) I told him so but he said "well my 26 will cut good with me about standing on it" So we ran it some more and he decided that maybe I should open up his muffler a little.We put in on the bench and took off the muffler and I walked to the drill press and I heard him say well I'll be dammed ! I turned around and he was looking in the exhaust port at the piston. He said shes scared up already ! so I went over and yep there is a narrow maybe 1mm scratch about dead center of the exhaust port on the new piston. It is small but when you feel it with your finger nail you can feel it just barely.So now he does not know what he wants to do He is thinking of just running her for as long as she will go maybe it will get worse maybe it wont but right now he does not have enough money to buy new. He saw a new pro 62cc stihl that he really wants but for now I guess he is planning on running it for a day then re-checking the scratch? It is our theroy that where the jug had sooo much transfer on it that maybe he didnt get all of it off.Nethier one of us have perfect vision but it did llok good to him and he is the one who knew where the transfer was in the beginning.
I feel really bad I know he needs his saw and he has no money.I am as sure as I can be that I did not do anything wrong on the rebuild. We pulled the plug 3 diffrent times and it was a kind of brownish tan not white/tan.That just leaves the cyl still having a small spot of transfer on the exhaust side some place the we did not see? Thanks to all of you that helped me with questions on this 029 rebuild,... we did piston,grudion pin,circile clips, seals, piston, gas line, Impluse line, fuel filter. The only thing we had left over was one of those a/v plugs?Thanks fo your opinion. Jeff

Check the av mount by the muffler. That is probably the one you left out. Tom

 

[Jeff Lary]

That scratch should impair you in any way! Much to small to cause a power loss. But what is really a shame is not going to a 390 kit for a real upgrade.

edit. did you replace the cylinder as well or only the piston?

good luck,

7

He could not afford a cylinder he thought , atleast through the dealer anyway. I told him about the 39 kit but he wanted to keep it the way it was. After all it was HIS saw not mine. did you mean to say " should not impare you in any way ,or should impare you in any way ?"

 

[Jeff Lary]

Check the av mount by the muffler. That is probably the one you left out. Tom

It's one of those things, we rolled that saw 20 times and cannot see any missing anywhere but I will tell him to look near the muffler. Thanks tom

 

[7sleeper]

He could not afford a cylinder he thought , atleast through the dealer anyway. I told him about the 39 kit but he wanted to keep it the way it was. After all it was HIS saw not mine. did you mean to say " should not impare you in any way ,or should impare you in any way ?"

Yeah you got me. Oh course should not!

7

 

[Fish]

The one lone scratch sounds like a piece that wasn't buffed out, the saw may be saved, possibly by tearing it down again, rebuffing out the
cylinder correctly, removing the rings{carefully} and cleaning the grooves.

If you continue to run it, as the scratch has already partially pinned the rings down, is totally burn up the new piston.
Take it back apart.

 

[Jeff Lary]

The one lone scratch sounds like a piece that wasn't buffed out, the saw may be saved, possibly by tearing it down again, rebuffing out the
cylinder correctly, removing the rings{carefully} and cleaning the grooves.

If you continue to run it, as the scratch has already partially pinned the rings down, is totally burn up the new piston.
Take it back apart.

Ok I will try to talk him into it. Thanks for the reply fish

 

[Fish]

We put the 029 together today the piston just fell in when I pushed in on the rings at the transfer points no problem there. Jeff

This one phrase has stuck in my brain for a day or so.

I don't remember the details of the begining of this. Are you sure that you put in the correct piston/rings?

What was the replacement part number of the piston assy. you used???

 

[Fish]

Up date to my cousins 029. Turns out it is a 029 super he brought it up today and we tore it apart my first time touchin a Stihl. The piston and cylinder are both toast the jug is scared some and the piston is just all groved up bad. He has taken them to a guy that is supposed to have a bunch of parts to see what he can find.
I will tell you this from my prospective at least man is that thing a pain to get it to the point of getting the cylinder off compared to my Partners. I am a little worried about trying to put it all back together espically the handle/ top cover/ carb mouting section. But I will try.
How do you get the clutch off is that nut left hand thread? I would guess it is. We did end up taking the flywheel off and probably should have the clutch as well? But I did not,.. just a little nervous with another persons saw ( did not want to take any more off than needed I guess) I took off enough to suit me let me tell you !! ha ha. I will let you know how we make out. Jeff

This scares me a tad.......

 

[Jeff Lary]

Yea I knew the "fell in would someones attention ha ha " no all I meant was after I got the rings past the transfer beginings the assembly slipped in nicely. Remember how I was worried about getting the rings colapsed enough to get the Piston into the cly. I was just saying basically that It went together well. as far as the part number? I have no idea the box I think is still in the shop someplace.He bought the piston from a reputable dealer up here. I just spoke to him and told him to take the plug out so it cannot be run untill we tear it down again.He did just tell me somthing interesting though.
I called him and explained that I wanted to tear it down and look at the cly wall myself as there must still be a bad spot some place. I honestly did not look the cyl over too much as he had it with him the whole time. He did the acid cleaning and he told me that he got it all cleaned up good. So when he came up we put it in the vice and slipped the piston into place and put it together.
Like I said he just told me , " yea I may have left some aluminum behind up above the exhaust port I remember there was some there but it was hard to reach" I should have looked inside myself obviously but I trusted him after all it was his saw and his money I figured if it was not clean he would have said somthing. What is the best method to remove all transfer from the cyl? You mentioned buffing it out right? how would you "buff up inside there" I have no way of doing so, at least I dont think I do.I do have a lot of tools so maybe I can do somthing better than he did?

 

[Fish]

You need to pay more attention to part numbers........

You also need to get part numbers and pics here.

Just saying.....

 

[Jeff Lary]

This scares me a tad.......

Oh dont be scared a tad at all ! I was just typing the way I was thinking at this point of the project. Remember I have never had a stihl apart e-v-e-r so I was wondering out loud about some very simple things that needed not be worried about at all.
I am not a pro saw tech absoloutly not and if I ask somthing that is just oh so obivious to you remember I was working on my cousins saw that had about zero wasteable money.I just did not want to screw anything up I have never had all this stuff off before and thinking it would be maybe weeks before he could afford parts and we had a chance to put it all back together I was just worried I would forget the assembly order thats all. "And I did" ha ha ha , but I have much less fear now,... that I have done it once.

 

[Fish]

yes, but what was the original diameter of the original piston???

 

[Jeff Lary]

I will go look for the box and measure the old piston tomorrow sometime.As far as part numbers I guess your right but I have no way of knowing the part number for the orig piston that we were replacing? and Pictures Like I said in the beginning our year old Brittny ate my camera and buying a new one just aint in the cards now. As far a posting a play by play of the ptocess not gonna happen probobly. The reason is,.. cous is not into waiting for me to take a photo and post it then wait for a reply. He is a farmer and is very straight foward in his doings my saw dont run cant afford to buy new can you help me? He could not care less about saws guns ax's cars get in or on or pull it and it either runs or shoots or whatever a no nonsence sort of guy ya know the type I ma sure. If it were my saw and I had all the parts here with me all the time I would have found a way to take a photo or two. The day we got it apart he took the piston and cyl and went to the stihl dealership and ordered parts I guess. In any case he left here with the P/C then showed up a few days later and said I need the saw tomorrow lets put her together.

After thought:: I actually did have an IPL and that would have given me the part number for the orig 029. He had this one given to him for non payment of a bill ,but I am sue it was most likely all orig. I guess to me common sence dictates that a saw shop that sold stihl for 30+ years would have given him the correct parts ?

 

[Saw Dr.]

I guess to me common sence dictates that a saw shop that sold stihl for 30+ years would have given him the correct parts ?

Don't count on it.

Guys like your cousin are great customers. No maintenance or interest in doing it. I can make waaayyyy more money repairing their thrashed stuff than selling them new.

 

[Fish]

Well there is a possibility that you put the 45 mm 029 piston in, since you said it went together easily, which it should not have.

In the beginning of the thread, we all assumed you had an older 029, but then rereading later it turns out it is an 029 Super, which
definitely has the 46mm piston.

So that is my theory.

 

[Jeff Lary]

Ok the old piston measures 45.79mm ( wide ) x 37.00mm tall flat top dual ring. The new piston box ahs this part number on it, 11270030-2003 As far as the correct rings asked about earlier the new rings were on the new piston when I took it from the box.
P.S. I will be working in the woods a while so I wont be able to respond till later today. Jeff

 

[Fish]

Well, good. It puts that worry to rest, that is the number for the 46mm piston.

 

[Saw Dr.]

As Fish said, it looks like you got the right piston. Without pictures, I am not going to offer advice on the saw. I am, however, quite curious as to why you are so interested in repairing the saw for your cousin? It sounds to me like he is just going to shred it again.