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#Post#: 76144--------------------------------------------------
Compression problems
By: shoesnsocks Date: February 21, 2017, 2:01 pm
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Not sure if this is the right place to post this question. I'm a
total noob mechanic without someone to train me. I'm working on
a hand held blower right now that has a compression of 85 and
the minimum in the book says 90. The customer used too much oil
in there fuel, but the cylinder doesn't look that crazy bad ( a
little varnish but the piston is clean on the sides I can see.)
Someone already told me it might have a stuck ring on it but
they can't see it to be sure (Tech service on the phone).
Basically I'm not so sure the customer even wants to spend too
much and he already needs a new carb, spark plug, and fuel tank
grommet. How poorly will it run if the compression is 5 lbs
below the book's minimum?
#Post#: 76145--------------------------------------------------
Re: Compression problems
By: RoyM Date: February 21, 2017, 2:11 pm
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What is the make and model? It sounds like it may be simply worn
out, a new carb and plug may already make it uneconomical to
fix.
#Post#: 76146--------------------------------------------------
Re: Compression problems
By: shoesnsocks Date: February 21, 2017, 2:35 pm
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It's an echo PB-250, It looks pretty new too, at least purchased
within the last 5 years. the thing that gets me is the cylinder
looks pretty clean except for the varnish around the bottom rim,
no scoring or anything.
#Post#: 76147--------------------------------------------------
Re: Compression problems
By: Chainsawrepair Date: February 21, 2017, 2:48 pm
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I had one that had a stuck ring. I unstuck the ring and still
running. Clean the ring groove etc. IMO 120psi min, below that
they are iffy
#Post#: 76149--------------------------------------------------
Re: Compression problems
By: shoesnsocks Date: February 21, 2017, 2:58 pm
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[quote author=Cut4fun . link=topic=6331.msg76147#msg76147
date=1487710102]
I had one that had a stuck ring. I unstuck the ring and still
running. Clean the ring groove etc. IMO 120psi min, below that
they are iffy
[/quote]
Is it easy to put the cylinder and piston back together? I
haven't done it before and my boss would not be to happy with me
if it was something I couldn't put back together. We do have a
kid that could do it but he won't be here till friday
#Post#: 76150--------------------------------------------------
Re: Compression problems
By: shoesnsocks Date: February 21, 2017, 3:26 pm
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I actually got some info about it in the service manual. Is it
necessary to get a new cylinder gasket?
#Post#: 76153--------------------------------------------------
Re: Compression problems
By: Chainsawrepair Date: February 21, 2017, 5:11 pm
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I reuse base gasket if in good shape. Be careful not to tear it
on removal.
#Post#: 76165--------------------------------------------------
Re: Compression problems
By: shoesnsocks Date: February 21, 2017, 9:27 pm
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[quote author=Cut4fun . link=topic=6331.msg76153#msg76153
date=1487718712]
I reuse base gasket if in good shape. Be careful not to tear it
on removal.
[/quote]
Right on thanks man. I'm going to talk to the boss about it all
tomorrow.
#Post#: 76177--------------------------------------------------
Re: Compression problems
By: Al Smith Date: February 22, 2017, 3:07 pm
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More times than not if you just squirt some WD-40. kroil or
something in the cylinder and let it soak a couple days it will
free a stuck ring .
#Post#: 76186--------------------------------------------------
Re: Compression problems
By: RoyM Date: February 22, 2017, 9:41 pm
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That is a good blower, I would go deeper. As was suggested, a
stuck ring may be the problem. Check the air intake. Is the carb
throat reasonably clean? If it is gritty air filter maintenance
or lack thereof may be an issue.
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