Jonsered CS 2166

[JeffreyZirkle]

Tore the saw down today and found this. So whats my best option to fix this. And except the piston and head, should I replace anything else.
Aftermarket parts ?
If so, what Husqvarna model is equivalent ?

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[Bob Hedgecutter]

Tore the saw down today and found this. So whats my best option to fix this. And except the piston and head, should I replace anything else.
Aftermarket parts ?

And except the piston and head, should I replace anything else.

I'd say bearings and seals at the very least- possibly crank as well.
You should split the cases and figure out which hard metal bit fell apart, took a loop through the transfers and destroyed the piston before you bolt a new top end on and cross your fingers.

 

[JeffreyZirkle]

And except the piston and head, should I replace anything else.

I'd say bearings and seals at the very least- possibly crank as well.
You should split the cases and figure out which hard metal bit fell apart, took a loop through the transfers and destroyed the piston before you bolt a new top end on and cross your fingers.

Rings blew apart but yes I agree that I probably should replace all the bearings

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[Bob Hedgecutter]

Rings blew apart but yes I agree that I probably should replace all the bearings

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Never seen rings just blow apart- something made that big gouged area through the lands and broke the rings in the process.

 

[JeffreyZirkle]

Never seen rings just blow apart- something made that big gouged area through the lands and broke the rings in the process.

The bearing inside the piston was intact so only other thing it could be is the bearing on the crank. Only thing I have not done yet is split the case in half

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[JeffreyZirkle]

I have not ran this saw much, I bet I have not cut more than 5 to 10 cords of wood with it

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[Bob Hedgecutter]

I have not ran this saw much, I bet I have not cut more than 5 to 10 cords of wood with it

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From new? Or you buy it secondhand?
If not the bottom end bearing- it could be part of the crank bearing cage from either side, or broken off bearing shell.
Possible it may have come from the intake side of the saw if the carb butterfly is missing a screw, or the earth strap burns off the sparkplug and falls down.

If it was bouncing around for a while before it caught in the lands- the top of the piston should look like someone took to it with a jackhammer.

 

[JeffreyZirkle]

From new? Or you buy it secondhand?
If not the bottom end bearing- it could be part of the crank bearing cage from either side, or broken off bearing shell.
Possible it may have come from the intake side of the saw if the carb butterfly is missing a screw, or the earth strap burns off the sparkplug and falls down.

If it was bouncing around for a while before it caught in the lands- the top of the piston should look like someone took to it with a jackhammer.

No,I bought it brand new and was a back up saw. Maybe 4 gallons of fuel ran through it.

Top of the piston looks good. But I can take pics of it when I get back over to the shop.

My problems all started with the compression switch. A few weeks before the saw went down, I pulled and pulled and pulled and like to never got it started. I pulled the compression plug out after discovered that it was depressed. Once I popped it up, the saw fired up first pull.

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[Bob Hedgecutter]

No,I bought it brand new and was a back up saw. Maybe 4 gallons of fuel ran through it.

Top of the piston looks good. But I can take pics of it when I get back over to the shop.

My problems all started with the compression switch. A few weeks before the saw went down, I pulled and pulled and pulled and like to never got it started. I pulled the compression plug out after discovered that it was depressed. Once I popped it up, the saw fired up first pull.

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Thats another option.
Decomp pushed in, saw stored, shaft of decomp rusted up- end broke off when you pulled it out, rust sealed the hole up, saw started- decomp nub destroyed saw.

 

[JeffreyZirkle]

Thats another option.
Decomp pushed in, saw stored, shaft of decomp rusted up- end broke off when you pulled it out, rust sealed the hole up, saw started- decomp nub destroyed saw.

I looked at the cylinder pics, decompression plug is still in it and looks fine. I will look at a pic on line, but it appears to be a flat bottom

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[Jasent]

Looks like sir clip let go to me. Or someone stuffed a rope in it for piston stop and it fed in the transfer and chopped a chunk off

 

[JeffreyZirkle]

Looks like sir clip let go to me. Or someone stuffed a rope in it for piston stop and it fed in the transfer and chopped a chunk off

Sir clip ?
No rope has ever been in it

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[tomalophicon]

Sir clip ?
No rope has ever been in it

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Circlip.

 

[Jasent]

Circlip. Clip that holds wrist pin in piston

 

[JeffreyZirkle]

Circlip. Clip that holds wrist pin in piston

No, that was good, clip was present and in place

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[Jasent]

What about the bearing cage?

 

[JeffreyZirkle]

What about the bearing cage?

Educate me of what bearing we are talking about, if we are talking about the bearing that is in the piston, it was good and all the roller bearings are there.
The only other bearing I know of is the one at the cam

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[Bob Hedgecutter]

Educate me of what bearing we are talking about, if we are talking about the bearing that is in the piston, it was good and all the roller bearings are there.
The only other bearing I know of is the one at the cam

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Go back to #7, there are three more bearings that can start breaking up and letting bits of hard metal into the bore- the big end bearing between crank lobes and inside the big bottom end of the con rod, then either of the two crank shaft case bearings that hold the crank itself in correct orientation in relationship to the bore of the cylinder.
If your saw has a cam- maybe it was the timing chain.

 

[Lee192233]

Aren't most Jonsereds turbocharged? Maybe the turbo blew up?!?

 

[Lee192233]

Sorry.....couldn't resist.