hill
Collector wannabe
Posts: 11
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Post by hill on Jun 19, 2008 7:28:55 GMT -5
Hi again guys...I ran the little XL for a half hour or so yesterday cutting some 3" branches. The saw sounded a little rich to me, so I attempted to adjust the carb (first time ever). I didn't really know what I was listening for so I gave up after a little bit, but did notice oil was leaking from under the muffler and there was a good bit being sprayed from that area. Any hints on what to do here? I hope I didn't hurt anything. A little help on adjusting the carb would be great too. Thanks. BTW...I only have two adjustment screws (one small, one big) I don't know what the bigger one is for? The small one is the high speed and the big one is chain oil adjustment?  |
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Post by lesorubcheek on Jun 20, 2008 9:17:06 GMT -5
Hello Hill,
Only 2 adjustment screws means one is for the idle speed (opens the throttle butterfly) and the other is idle mixture (jet for Low speed circuit). If you're seeing lots of oil (and I assume probably smoke too) its usually a sign of the engine sucking in oil from the oiler tank. Most of the little XL/Super XL saws use two lines going to the oiler tank. One is longer and reaches to the bottom of the tank and has a filter bob on the end. The other line has a special porous metal connector with a duck bill valve on the end. The duck bill allows air to pressurize the tank, but doesn't allow oil to be sucked back into the crankcase. When the duckbill falls off, or deteriates, oil can be sucked into the engine and create problems as you've described. The duckbill sits on a porous metal connector that's supposed to be partially exposed so that after the saw is turned off, the pressure can escape the tank and prevent oil from being pushed out the oiler when its not needed.
So, I'd open the oil cap, and look inside. If you see a hose entering that has nothing on the end, or has only a little metal piece, you've probably identified your problem. If you see a orange duckbill valve on the end, then probem is probably elsewhere. I'd start suspecting the oiler body if your duckbill looks OK.
Dan
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hill
Collector wannabe
Posts: 11
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Post by hill on Jun 20, 2008 14:06:33 GMT -5
The duckbill is attached, so that's not the problem. I'm going to take it to the guy who sold me the 5100 and let him take a look/listen to it. I'm hoping to learn a little from him. I'm not familiar enough with saws yet to be tearing it completely down yet. Thanks for the help.....again.
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Post by lesorubcheek on Jun 20, 2008 14:28:25 GMT -5
Rats.. Well, if the duckbill is in place, next thing I'd suspect is a worn pump housing. There's a diaphram that's located behind a cover plate held on by 3 screws. The diaphram is a flat rubber type material with a metal rod in the center. The rod goes into a metal housing that's pressed into the case. If the clearance between the diaphram rod and the housing is too much, lube oil can pass by here and end up in the engine where it doesn't belong.
One way to test if its really lube oil you're seeing (or maybe just a really over-rich carb) is to empty out the lube oil, remove the bar/chain, and run it a bit and see if you're still seeing the oil spray you've described. If the oil stops, then it is lube oil somehow getting into the engine. If it still is oily, then there's something up with the carb being really over-rich.
Dan
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Post by woodplayer on Jun 20, 2008 18:39:40 GMT -5
Hi hill Also check the oil lines to make sure they aren't reversed. Before I found this (HOH) site I had posted over at AS. Just so happens that it was the guys on this site posting over there that helped me out!! www.arboristsite.com/showthread.php?t=63415Some of the photos and diagrams should be helpful. Good luck |
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