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Post by muzzleblastm38 on Nov 7, 2020 19:40:27 GMT -5
Why I keep scroring piston when milling
After each day of work I removed exhaust and do a visual check
I burn 2 to 4 saw a year
The tech told me to ingress oil I have tried 40:1 32:1
And luck
Running full synthetic oil also no luck
I have also tried running more riche and luck
Now I have score my xl-76 because It whas the only saw
Not out of services do to parts on order
Please help I need to mill more wood
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Post by undee70ss on Nov 7, 2020 19:47:05 GMT -5
Im no expert on milling, but with milling puts extreme stress on a chainsaw. You're probably burning up saws because they are overheating, assuming they are tuned correctly.
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Post by sparky on Nov 8, 2020 8:08:14 GMT -5
Undee could it be running to lean?
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Post by muzzleblastm38 on Nov 8, 2020 10:15:58 GMT -5
the last one whas almost 4 strocking
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Post by rowdy235 on Nov 9, 2020 17:14:59 GMT -5
I think undee is onto something with overheating. I haven't done a lot of chainsaw milling but I have done enough to know you're running the saw under a heavy load for a long continious period, not like when you are bucking/limbing/felling, where you are running at high speed briefly with lots of pauses in between.
I'd make a test run and use a digital thermometer to keep an eye on the cylinder temps. To get a baseline I'd pry run the same saw doing "normal" cutting for 15 minutes or so. If you see temperatures climbing well above the baseline, that's your issue. When you get into seriously hot temps, no amount of oil or no kind of oil will help.
To remedy the problem, you may look at building a device to force more air into the saw. Maybe something with a flexible duct and blower.
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Post by charles on Nov 9, 2020 17:58:54 GMT -5
Slowing down your feed rate will take some of the load off the saw . Also cleaning out the cooling system after each use
will help it cool better .
Charles
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Post by sweepleader on Nov 9, 2020 21:15:44 GMT -5
Synthetic oil will stand higher temps but I would not count on it to solve this issue. The piston is the most heat vulnerable part in the engine, it is cooled by contact with the cylinder wall and incoming air/fuel/oil mix. As you might imagine, this is not a great situation. Contact with the cylinder wall is only through a film of oil and the incoming charge has very little heat capacity.
I would work on the cooling system as charles and rowdy suggested, I think they are onto your answer.
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Post by sawnami on Nov 12, 2020 10:14:52 GMT -5
The guys in our regional chainsaw group rarely use a saw less than 90cc to mill with. I hate to admit it, but the large displacement Stihl's are their "go-to" saws for milling. They tend to be designed to cool well under sustained load and RPM use and their crank bearings hold up well. One guy has been using an 066 with a 72" bar for years without issues. He goes out to recycling log yards and mills on site.
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Post by muzzleblastm38 on Nov 13, 2020 18:24:38 GMT -5
i run usually my stihl ms660 with 28 inch ,for oil is stihl ultra with ratio 32:1 but my saw is out and waitting for parts
so i decided to run my xl-76 with 24 inch bar
after only 6 slabs when i whas cleaning the saw i nodice the scroring
all my saw i clean them and inspect every days of use
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Post by rarefish383 on Nov 14, 2020 6:55:27 GMT -5
Something is wrong and I can’t figure it out. I mill mostly Red Oak with two saws, a 50 year old Super 1050 with 36” 404 chain and a 660 with 36” 3/8 chain. When I mill it’s not uncommon for me to mill all day. I use Stihl Ultra at 50:1. I have never burned up a saw milling. I touch up the chain after every fourth slab to keep it SHARP, and never lean on it. I don’t use milling chain, out of the box Stihl yellow chain cuts faster. I’ve found that a smooth surface is more technique than cutter design. If you have to push hard on it it’s dull, and you are going to over heat it. BobL over on AS has a video of his saw self feeding as he’s sitting in a chair with a glass of ice tea, and he’s milling Aussie hard woods. I’ve used saws as small as my Echo 305 climbing saw to mill with. I milled two benches out of Black Locust for the Boy Scouts on one outing with it. I just make sure I let it run at full RPM. If you push hard enough to pull the R’s down, you’re going to cook it. Hope you find out what’s going on, Joe.
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Post by 5terrysupersaws on Nov 14, 2020 19:47:20 GMT -5
i run usually my stihl ms660 with 28 inch ,for oil is stihl ultra with ratio 32:1 but my saw is out and waiting for parts so i decided to run my xl-76 with 24 inch bar after only 6 slabs when i was cleaning the saw i noticed the scoring all my saw i clean and inspect them after every day of use Post a picture of the XL-76 piston to help determine the cause of scoring . |
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