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#Post#: 46382--------------------------------------------------
5100s air leak
DIR By: dolmar
Date: September 13, 2014, 9:26 pm
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what is the best way to find a air leak on my 5100s, saw run
great last year but now I got a air leak somewhere any help
would be great thanks.
#Post#: 46383--------------------------------------------------
Re: 5100s air leak
DIR By: 660magnum
Date: September 13, 2014, 9:42 pm
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You can do a close examination but likely the only way you will
find it is with a pressure vacuum test.
#Post#: 46384--------------------------------------------------
Re: 5100s air leak
DIR By: 660magnum
Date: September 13, 2014, 9:55 pm
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Sources of air leaks . . .
Seals around the crankshaft bearings on either the chain or
flywheel side or both sides.
Carburetor intake rubber boot
Compression relief valve but I don't think the 5100s has one?
Impulse line if it has one.
- - - - - - -
The test involves blocking off the carburetor and muffler exits.
Pump up the engine with 7 lbs of air pressure and check for
leaks with soapy water? If you find the seals leaking at the
crankshaft on either side, you have found the problem and no
need to do the vacuum test.
And then draw 15" vacuum on the crankcase and see if it still
has 10" vacuum after 30 seconds. The vacuum test is to check for
bad seals on the crankshaft ends. The vacuum test will show the
seals bad where the pressure test did not.
If it fails, you try some heavy oil on the seals and see if it
changes the leak rate any.
#Post#: 46455--------------------------------------------------
Re: 5100s air leak
DIR By: NathanielVansickle
Date: September 14, 2014, 5:34 pm
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+1 and no decomp on a 5100
#Post#: 46458--------------------------------------------------
Re: 5100s air leak
DIR By: 660magnum
Date: September 14, 2014, 5:39 pm
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I have a 5105 with no decompression but didn't know about the
5100.
#Post#: 46803--------------------------------------------------
Re: 5100s air leak
DIR By: dolmar
Date: September 20, 2014, 7:20 pm
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still cant find the air leak checked everything I could think of
any of you guys had this problem with your dolmar
#Post#: 46804--------------------------------------------------
Re: 5100s air leak
DIR By: 660magnum
Date: September 20, 2014, 7:27 pm
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I have a 2009 5105 but never any trouble with it.
I've seen a couple 5100's with the clutch side bearing spinning.
#Post#: 46807--------------------------------------------------
Re: 5100s air leak
DIR By: farmboy
Date: September 20, 2014, 9:05 pm
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--- Quote from: Nathaniel Vansickle link ---
>
> +1 and no decomp on a 5100
>
--- End Quote ---
I put a decomp on one of my 5100's won't do that again pops it
out every pull. It is pulling 205 psi w/base gasket tho.
Checked it w/2 guages.
Shep
#Post#: 46817--------------------------------------------------
Re: 5100s air leak
DIR By: jmester
Date: September 21, 2014, 6:01 am
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Not real familiar with the Dolmar saws. But may be worth a try
to check the cylinder base screws for tightness. Have seen them
come loose on some 50cc husky saws. Has the saw sat since this
time last year? If so you may need to look for a fuel issue more
so than a air leak.
#Post#: 46864--------------------------------------------------
Re: 5100s air leak
DIR By: aclarke
Date: September 21, 2014, 10:29 pm
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As Jmester mentioned, i'd look into fuel flow issue. Perhaps
pull the carb apart and clean/inspect
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