High Quality Chainsaw Bars Husqvarna Toys

What's on your bench?

beaglebriar

The Peanut Gallery
GoldMember
Local time
7:57 AM
User ID
377
Joined
Jan 1, 2016
Messages
18,500
Reaction score
103,330
Location
Warren Center, PA
Country flag
039 rebuild... chicken chit into chicken salad.. maybe?? lol

Cleaned up the cylinder. Might as well grind on it.

Widen and square the intake, widen exhaust a bit also. Just roughed in.. I'll finish it tomorrow.
db6979b4a0c0465dc9763474bdebecdd.jpg
45811fc7d72c9a71838b81c8d7aa0aab.jpg
475d9ca8d8fecc7a97908c79487b0957.jpg
91a3b5db3e36b25a221ec142cc8478d7.jpg
 

Duane(Pa)

It's the chain...
GoldMember
Local time
7:57 AM
User ID
325
Joined
Dec 30, 2015
Messages
4,680
Reaction score
23,766
Location
Centre County
Country flag
MS362 M-tronic with a scored piston. Tree guy I know who takes real good care of his stuff. Vac/pres tested before tearing it down and it was tight as a drum all the way around. Good mix. Didn't lean out from an air leak or get straight gassed. No significant transfer on the cylinder, but some gouging below the exhaust port.

I did find the air filter loose and some fines in the strato intake but no scoring on the intake side of the piston, just the exhaust side. I also found this under the piston crown. I'm guessing carbonized debris ingestion from the loose air filter and the piston damage is related. I've never seen carbon buildup under a piston before.

Thoughts / opinions?

I have to think you may be onto something with your diagnosis. Maybe @drf256 will show a pic of the 562 piston once he has it apart. The 362 piston in your pic sure has an aerodynamic shape. Just wonder if Husky has a similar evolution.
 

beaglebriar

The Peanut Gallery
GoldMember
Local time
7:57 AM
User ID
377
Joined
Jan 1, 2016
Messages
18,500
Reaction score
103,330
Location
Warren Center, PA
Country flag
MS362 M-tronic with a scored piston. Tree guy I know who takes real good care of his stuff. Vac/pres tested before tearing it down and it was tight as a drum all the way around. Good mix. Didn't lean out from an air leak or get straight gassed. No significant transfer on the cylinder, but some gouging below the exhaust port.

I did find the air filter loose and some fines in the strato intake but no scoring on the intake side of the piston, just the exhaust side. I also found this under the piston crown. I'm guessing carbonized debris ingestion from the loose air filter and the piston damage is related. I've never seen carbon buildup under a piston before.

Thoughts / opinions?

I'd guess it got hot...burnt oil.
 

PogoInTheWoods

Pinnacle OPE Member
Local time
7:57 AM
User ID
1190
Joined
Apr 23, 2016
Messages
1,943
Reaction score
3,848
Location
Ohio
Country flag
No way for oil to get there without a crack in the case or a bad gasket. Bottom end still well lubed with mix when I pulled the cylinder and no evidence of excessive heat on any of the components that would typically show it in a meltdown.

Nice work on that 039 cylinder, btw. Needs a popup now. LOL

HLS has the Cross on sale today for like 8 bux or somethin' like that.
 

beaglebriar

The Peanut Gallery
GoldMember
Local time
7:57 AM
User ID
377
Joined
Jan 1, 2016
Messages
18,500
Reaction score
103,330
Location
Warren Center, PA
Country flag
No way for oil to get there without a crack in the case or a bad gasket. Bottom end still well lubed with mix when I pulled the cylinder and no evidence of excessive heat on any of the components that would typically show it in a meltdown.

Nice work on that 039 cylinder, btw. Needs a popup now. LOL

HLS has the Cross on sale today for like 8 bux or somethin' like that.
Mix oil collects under the piston during normal operation. Something like cutting with a dull chain on a hot day could cause it to burn under the piston with the added heat.

I have a cross pop up to put in the 039.
 

PogoInTheWoods

Pinnacle OPE Member
Local time
7:57 AM
User ID
1190
Joined
Apr 23, 2016
Messages
1,943
Reaction score
3,848
Location
Ohio
Country flag
Mix oil collects under the piston during normal operation. Something like cutting with a dull chain on a hot day could cause it to burn under the piston with the added heat.

Maybe so, but I've never seen this before even in completely seized top ends. As mentioned, there was no evidence of a severe heat condition, just debris ingestion. Even the rings were still free. That said, and keeping in mind this is a strato saw, I can see fines collecting and baking to the underside of the piston crown when injected through the strato port but not making it all the way through the exhaust cycle (even though that would happen toward the end of it) -- unlike being sucked straight through the intake and blown out muffler after combustion.

All I do know is an OEM top end for a MS362 is $235 and I'm only speculating on the cause of how the original one got damaged, though I am inclined to stick with the loose air filter theory considering I can't find any other reasonable explanation. Just makes me nervous putting it back together without absolutely knowing what happened.

Don't get me wrong. I'm grateful for the input. Just hoping for something more conclusive before I commit to putting a new top end on it.

Otherwise, Hooray Hot Rod 039! LOL That thing is gonna rip.
 

Onan18

OPE Sponsor
GoldMember
Local time
7:57 AM
User ID
344
Joined
Dec 30, 2015
Messages
4,444
Reaction score
24,735
Location
Georgia
Country flag
20180705_131252.jpg

20180705_131257.jpg

20180705_131410.jpg



Just got through short blocking this Echo SRM 265T (got replaced with a 266 short block) and all I can say is man this thing rips!!! While everything was apart I evicted the CAT and re-tuned the carb, sounds nasty to only be 25.4cc
 
Last edited:

huskihl

Muh fingers look really big
GoldMember
Local time
7:57 AM
User ID
360
Joined
Dec 31, 2015
Messages
22,456
Reaction score
143,009
Location
East Jordan, MI
Country flag
Maybe so, but I've never seen this before even in completely seized top ends. As mentioned, there was no evidence of a severe heat condition, just debris ingestion. Even the rings were still free. That said, and keeping in mind this is a strato saw, I can see fines collecting and baking to the underside of the piston crown when injected through the strato port but not making it all the way through the exhaust cycle (even though that would happen toward the end of it) -- unlike being sucked straight through the intake and blown out muffler after combustion.

All I do know is an OEM top end for a MS362 is $235 and I'm only speculating on the cause of how the original one got damaged, though I am inclined to stick with the loose air filter theory considering I can't find any other reasonable explanation. Just makes me nervous putting it back together without absolutely knowing what happened.

Don't get me wrong. I'm grateful for the input. Just hoping for something more conclusive before I commit to putting a new top end on it.

Otherwise, Hooray Hot Rod 039! LOL That thing is gonna rip.
Being a strato, there is already less fuel/oil getting into the bottom end. Combine that with 50:1 and an oil that is light on detergents, and there isn't enough detergent going through it to wash it off or keep it clean.
I've seen it on 8 or 10 saws now. Not all stratos, either. In every one, they were run on 50:1 with cheap oil and probably tuned a little lean
 

Tor R

Newbie
GoldMember
Local time
12:57 PM
User ID
439
Joined
Jan 8, 2016
Messages
5,142
Reaction score
33,055
Location
Mandal, Norway
Country flag
Them Husky boys never gone get them 550/560/562's right...560 year 2017 week 41, blown flywheel bearing, I paid 300$ for the project.
_DSC4884.jpg

While doing preasure/vacuum test, I got the time to put in a couple more tool kits, think I'm covered, at least for now...
_DSC4886.jpg

went nice and through vac/preasure tests, starting & oil etc... left to dress it with a bar & chain and cut some wood
_DSC4889.jpg

_DSC4887.jpg
 

Redfin

Meh...
Local time
7:57 AM
User ID
159
Joined
Dec 24, 2015
Messages
7,645
Reaction score
39,980
Location
Central Pa
Country flag
Maybe so, but I've never seen this before even in completely seized top ends. As mentioned, there was no evidence of a severe heat condition, just debris ingestion. Even the rings were still free. That said, and keeping in mind this is a strato saw, I can see fines collecting and baking to the underside of the piston crown when injected through the strato port but not making it all the way through the exhaust cycle (even though that would happen toward the end of it) -- unlike being sucked straight through the intake and blown out muffler after combustion.

All I do know is an OEM top end for a MS362 is $235 and I'm only speculating on the cause of how the original one got damaged, though I am inclined to stick with the loose air filter theory considering I can't find any other reasonable explanation. Just makes me nervous putting it back together without absolutely knowing what happened.

Don't get me wrong. I'm grateful for the input. Just hoping for something more conclusive before I commit to putting a new top end on it.

Otherwise, Hooray Hot Rod 039! LOL That thing is gonna rip.
Check the screen in the carb.
 

GCJenks204

"Special Buns"
Local time
6:57 AM
User ID
367
Joined
Dec 31, 2015
Messages
14,423
Reaction score
89,606
Location
Winnipeg, MB
Country flag
Them Husky boys never gone get them 550/560/562's right...560 year 2017 week 41, blown flywheel bearing, I paid 300$ for the project.
View attachment 131530

While doing preasure/vacuum test, I got the time to put in a couple more tool kits, think I'm covered, at least for now...
View attachment 131529

went nice and through vac/preasure tests, starting & oil etc... left to dress it with a bar & chain and cut some wood
View attachment 131531

View attachment 131534

Damn fine looking saw you have there Tor. What do you do with all your finished projects?
 
Top