Author Topic: Breaking loose a stuck piston  (Read 172 times)

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Offline Al Smith

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Re: Breaking loose a stuck piston
« Reply #10 on: December 07, 2016, 04:58:42 pm »
Forgot something on the Ford .I also looked at the position of the distributor to determine the cylinder was in fact on the compression stroke ..

Offline Al Smith

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Re: Breaking loose a stuck piston
« Reply #11 on: December 16, 2016, 05:41:10 pm »
Got a couple of pictures showing the piston and the cylinder with the spark plug with a grease zert
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Offline trail twister

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Re: Breaking loose a stuck piston
« Reply #12 on: December 16, 2016, 06:26:57 pm »
I have the sthil o31AV that is seized. But I can't figure out how to get to the cylinder to take it loose from the crank case.

 ;D  Al

Offline Al Smith

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Re: Breaking loose a stuck piston
« Reply #13 on: December 16, 2016, 07:04:01 pm »
According to the IPL it's held on with 4 socket head cap screws 5m by 18 .M5 would be an M4 allen wrench .Rule of thumb,the socket will be one size smaller than the bolt on a standard socket head ,two sizes smaller on a round head or low cap .

Online 3000 FPS

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Re: Breaking loose a stuck piston
« Reply #14 on: December 16, 2016, 11:32:58 pm »
I have the sthil o31AV that is seized. But I can't figure out how to get to the cylinder to take it loose from the crank case.

 ;D  Al

You see those holes in the top of the cylinder.    That is where you put your allen wrench or torq wrench to get to the cylinder bolts.
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Offline trail twister

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Re: Breaking loose a stuck piston
« Reply #15 on: December 17, 2016, 04:31:08 am »
 ??? It's the plastic stuff I can't get past. Got a whole Jar full of screws removed and that plastic keeps hanging on.

 ;D  Al

Offline Al Smith

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Re: Breaking loose a stuck piston
« Reply #16 on: December 17, 2016, 05:25:18 am »
What,the shrouding?The 031 is kind of a weirdo.The cylinder if I remember is at a 45 degree angle,not horizontal and not vertical .Who knows what they were thinking,too much schnapps perhaps .I've only seen two in my lifetime.One I tuned for a guy and the other in a dealers dead pile .

From what appears on the IPL the whole top cover goes from the top part of the rear handle clear up over the top in one piece .You get all the screws out of it it's bound to come off .Some of the older Stihl models they got real creative where to hid the screws ,like it was a game or something.Some models and this is probably one of them you nearly have to field strip them to get to anything.consider who made it .German engineering is fine work but complicated by design .I could ramble on for hours about that but I'll stop now .

Offline trail twister

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Re: Breaking loose a stuck piston
« Reply #17 on: December 17, 2016, 09:26:11 am »
Want it to go from this.


To this for a start.


And possible to this.


I really don't want to run over it with my tractor.

 ;D   Al

Offline Al Smith

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Re: Breaking loose a stuck piston
« Reply #18 on: December 17, 2016, 06:40:25 pm »
In looking at the IPL you're probably going to have to remove the muffler and "air guide".Other than that all I can tell from the drawing are 4 cylinder bolts .

Offline RoyM

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Re: Breaking loose a stuck piston
« Reply #19 on: December 17, 2016, 10:39:49 pm »
The 031 is a bear to work on as were most Stihls of that era. IIRC, the fuel tank and air box come off as a unit. The top handle assembly also needs to come off
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