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Post by edju1958 on Dec 7, 2018 14:00:33 GMT -5
I picked up a 540 last Jan.& have had it sitting around now for almost a yr.The piston is scorerd so I got a piston with rings.I haven't gotten to tearing it down just yet to check on the cylinder.Right now I'm trying to find an intake boot for it without much success.It seems to me that I read somewhere that guys were using Stihl intake boots with good success,the problem is I can't remember which Stihl boot they used.If anyone has any info on this I'd greatly appreciate it if you could share it.Thanks!
I just found the intake boot for the 540 at Randy's Engine Repair for $29.99.I know he was selling them on Ebay last yr.for around $40.I guess when you cut out the middle man you can drop your price & still have a nice profit. The next thing to do is to start tearing down that old girl & see what the cylinder looks like.
Ed
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Post by undee70ss on Dec 7, 2018 21:15:13 GMT -5
You get that piston from eBay? Pistons/cylinders for those are hard to find.
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Post by edju1958 on Dec 7, 2018 21:19:16 GMT -5
You get that piston from eBay? Pistons/cylinders for those are hard to find. No,I picked it up last winter from Bob Johnson.There's a cylinder on Ebay right now with gasket for $230,he came down $20 since the last listing.It says it's for a 25cc 540(?) Ed
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Post by edju1958 on Feb 20, 2019 17:45:32 GMT -5
I had to go back & hunt this thread up.I finally got around to pulling the cylinder on the 540 today,not as bad as I thought.The intake boot was actually not in that bad of shape,but I'm replacing it when the saw goes back together.I didn't know how bad the cylinder was till I pulled it off,it's not that bad,I think I can salvage it.It has some scoring on the exhaust side,but like new on the intake side.The piston is the same.I'm waiting for the pics to load to my email,then I'll post them.There are no gouges in the cylinder either.I'll need some help in getting the cylinder cleaned up,in that I've never done this before & I don't know what aluminum transfer looks like,& what grit sandpaper I should use.There are some dark spots that almost look like rust. Ed
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Post by edju1958 on Feb 21, 2019 17:04:02 GMT -5
I started sanding the cylinder last night by hand & thought it'd take forever.Trying to get my hand way up in the cylinderr was a bit on the painful side too.Today I had a dr.appointment & on the way home stopped at a hardware store to buy some emery cloth.I don't know how younger people don't know what a stove bolt is or even what emery cloth is.The worker thought I wanted a tack cloth.I told him no,it was kinda like sandpaper.We were in the sandpaper aisle & he didn't know if they even had any emery cloth.He went to ask his boss & his boss came back & pointed it out to him.I needed three different grits - #80,#120,& #320.Of course they only had #80 & #150,the next step up was #800,which was a big step in between grits,so I went home with the two grits I needed.I got home & thought there had to be an easier way than sanding by hand.I thought about an extra long sanding drum,which would've been the cat's meow,but they didn't have them at the hardware store.I picked up a piece of 1 1/4 in.pipe,it was just too small.I came in the house to have lunch & it hit me that I had a piece of 1 3/4 PVC pipe in the basement.I'd measured the cylinder & it was a hair over 2 in.The PVC pipe wrapped with the emery cloth was perfect,so I inserted it in the cylinder & turned it & turned it & turned it.I checked periodically to see my progress.You'll see in my pics below how nice it turned out.I'll just need to get a new gasket & it'll be ready for installation after I clean the cylinder up & put the new piston on. Ed Before cleaning After cleaning  thumbnail by edju1958, on Flickr |
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Post by rowdy235 on Feb 21, 2019 20:24:10 GMT -5
Wow Ed, that really came out nice! Looking forward to seeing it come together!
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Post by edju1958 on Feb 21, 2019 21:12:54 GMT -5
Thanks Rowdy! I'm looking forward top it too.I can't really do much right now till I get the gasket & a eing compressor set.I can rebuild the carb. Ed
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Post by onlyhomelites on Feb 23, 2019 9:38:00 GMT -5
Looks like new...nicely done!
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Post by edju1958 on Feb 23, 2019 11:22:37 GMT -5
Thanks Leon! I rebuilt the carb yesterday for it.There was something that I thought to be strange - the Hi needle was turned out 3 full turns & the Lo needle was turned out only 1 full turn.When I took the carb apart it was unbelievably clean,it looked like the carb was rebuilt just prior to it being pronounced dead.There wasn't even a tiny speck of dirt in the screen.The cylinder & piston were only scored on the exhaust side.I've been told that if the whole cylinder & piston were scored it was most likely straight gassed.If the scoring occurs only on the exhaust side it's usually an indication of an air leak. The cylinder gasket & conical washers are ordered & I should get them by the end of next week. Ed
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Post by onlyhomelites on Feb 23, 2019 11:39:15 GMT -5
Another common occurrence in the boot saws is that the boot is torn and the operator opens the carb up to try and keep it running. Of course that's a terrible idea, so it's possible that this was done with your saw and it overheated on that final use.
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Post by edju1958 on Feb 23, 2019 11:55:51 GMT -5
Actually Leon the boot was in good shape,there were no tears that I could see,but I didn't inspect it that closely either.I did notice that the boot was getting hard,loss of pliability,but then again the saw has been sitting since 2011.I'll take a pic of the boot & post it later. Ed
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Post by onlyhomelites on Feb 23, 2019 17:40:26 GMT -5
Sounds good Ed...if the boot wasn't the culprit, I'd check the crank seals closely while it's apart, just for good measure!
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Post by edju1958 on Feb 23, 2019 18:58:01 GMT -5
Thanks Leon,good idea! I checked the impulse line & the fuel line & they're both like new,so that eliminates an air leak at those two sources. Ed
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