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Stihl 036 rebuild

flh69

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A friend of mine has an 036 that the dealer said the piston had a hole and the cyl. was scored. Said it may have been caused by a partially blocked air cleaner causing it to run lean.
They wanted 300 plus for the rebuild kit plus labor. He bought a new 311 & is giving me the old 036. I do not have it yet but I have looked @ aftermarket rebuild kits online for a fraction of that price. If in fact that is what it needs are these rebuild kits worth fooling with. I tinker with them but have never done a rebuild.
 

fossil

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Wait until you get a look. Dealers don't clean up cylinders and frequently lie through their teeth.

I can't say I've heard of any pistons with holes in them unless someone was cranking on it with a steel piston stop.

That was my first BS signal
 

Adamski

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I had a local dealer tell my farm mate that his ms290 was knackered and due a new saw. He gave it to me to look at. The fuel line was squashed closed with the air box being packed full of ears of corn and barley straw bits etc. I clean it out and have it a service and it’s ran like new. Albeit it like a ms290 runs. I offered to muffler mod and retune it but he was happy as is with it. I thinned some woodland with him and used my Makita 6100 next to the 290. He is now rather disappointed with the 290. Anyway I went off topic.

Moral of the story is dealers are not very honest.
 

flh69

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Just pulled the carb & the muffler. There is a gouge running in the vertical direction of the piston on the carb side. Can not see any cyl. damage at this point.
 

Gord

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I have seen a hole through the top of a piston on a 441 right below the comp release (that leaked), saw was only about a year old - first and last one I have seen like that.
 

Wonkydonkey

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Yeh... I be inclined to do a p&v test first.. see if you find a leak..

Then rip the jug off and go from there..oh and what’s the plug colour.. keep us in the loop..
 

flh69

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cyl.JPG piston 2.JPG piston.JPG Thread update. I took the cyl. off. The piston is scored & the top of it has gouges. The cyl. wall looks good, no gouges but there are gouges up in the spark plug chamber. The rings are not broken but are seized on one side. The connecting rod has a lot of play on the crank. I have never had one of these apart but the play seems excessive??????
 

Michael Rupley

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Is it up and down play? The big end maybe spit a bearing and it danced around until it did the damage you found. Time for a new crank.
 

Lightning Performance

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A friend of mine has an 036 that the dealer said the piston had a hole and the cyl. was scored. Said it may have been caused by a partially blocked air cleaner causing it to run lean.
They wanted 300 plus for the rebuild kit plus labor. He bought a new 311 & is giving me the old 036. I do not have it yet but I have looked @ aftermarket rebuild kits online for a fraction of that price. If in fact that is what it needs are these rebuild kits worth fooling with. I tinker with them but have never done a rebuild.
You found the right place to Gitter Done.
Maybe the jug will live on.
 

Jimmy in NC

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A piece of a bearing went through there. Find the bearing that let go and decide from there. I am betting big end rod bearing but it could be bearing cage from a crank bearing or a piston pin bearing.
 

Stump Shot

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Clogged filter caused it to run LEANo_O? That tells you all you need to know about this dealer.

A Stihl dealer that doesn't know the saw has an intellicarb is one to stay clear of.

View attachment 208240 View attachment 208241 View attachment 208242 Thread update. I took the cyl. off. The piston is scored & the top of it has gouges. The cyl. wall looks good, no gouges but there are gouges up in the spark plug chamber. The rings are not broken but are seized on one side. The connecting rod has a lot of play on the crank. I have never had one of these apart but the play seems excessive??????

Side to side play is normal for the connecting rod, up and down is not.

Million dollar question is what was the foreign object and more importantly where did it come from.

You might be looking at a full rebuild with new bearings and seals.

If there is no scoring in the cylinder wall plating that cylinder can be cleaned up fairly easily. Save that old piston it can be the tool to do the job. Clean the top of the piston with a wire wheel removing all the carbon and oil. File off the gouges in the skirts and flatten the top of the piston on a true flat surface on a piece of sandpaper. Now take a piece of self adhesive sandpaper and stick the piston to it and cut off the excess with a razor knife close to the piston so none extends past the outside. Find yourself an eye bolt that will fit in the piston pin that will be tall enough to attach a cordless drill and give it a spin on the squish band, it should not take much to take of the high spots.
If aluminum transfer is present this will also need to be cleaned off, there are vidja's around here on how to go about that.
Now you're down to just needing a piston and can use your reclaimed cylinder. A quality AM piston will be just fine here.

Making sure there is no other damage is important so as not to repeat. If even the littlest bit of doubt remains split the case and do a full rebuild.

If this is rebuilt now is the time to assess the rubber parts such as the intake boot, impulse and fuel lines, as well as the carburetor diaphragms for possible replacement and new fuel and air filters and a new spark plug.

Note: this saw can be successfully rebuilt without disconnecting the oil pump from its output line, just ease it out of the way, this way the "fun" job of replacing said line doesn't have to be done if not needed to begin with.
 

flh69

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Thanks to all who replied. I am going to tear the bottom end apart to try to find what caused the damage. If I don't rebuild it I will keep it for parts as I have an 036 of my own. Matter of fact me & the friend that gave me this saw bought them together many years ago.
 

Al Smith

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I think they nailed it .Crank bearing broke,blew a chunk out which gouged the piston,got blowed up the transfer and hammered the piston .It should not be hard to possibly find a doner with a cooked top end to snatch a crank from if the big end cut loose .Piston,Meteor makes good ones that usually come with Caber rings .If OEM I have no idea what the freight would be Could be high might not be .Good saws for the size .
 

Wonkydonkey

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Just a thought,, is the top ring pin still in place,, I can see the lower ring pin in the pic
 

Al Smith

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A couple of cranks on flea bay at about 30 bucks a pop FWIW . AM piston around 30 . Seals ,maybe bearings, 100 and change maybe total everything .
 
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