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Chainsaw Repair
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#Post#: 84823--------------------------------------------------
Sthil 031 AV.
DIR By: trail twister
Date: April 4, 2019, 5:19 pm
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Saw was bought mid 1970's by my dad. I used it a little bit but
was really disapointed in it.
After I got married in 1985 I didn't get to cut with dad much
and I don't know any history of the saw after 1985.
I owned the farm where my folks were living and had a big garage
52x24 garage there so when dad passed I was cleaning it up and
displaceing all the people who thought it was their private work
shop with some unique door lock systems.
I went all thru that shop and never saw dads saw so I asked my
brother about it when I seen hi. He said dad had some problem
with it and took it to a small engine repair guy who told him it
was not worth repairing. I called that guy and he said my dad
had picked it up when it wasn't worth fixing.
Funny thing that missing saw next time I was there about 3 weeks
later the saw sat in front of one of the big over head doors.
It is locked up so I brought it home and poured some diesel
acetone mix in there. It has been sitting under my bench for
about 5 years full of that mix and it is still locked up.
I see I can buy a new Jug, Piston, wrist pin and bearings for
it.
I sure can't figure out how to get to the jug to get it off the
case.
Is there an IPL I can down load and use?
:D Al
#Post#: 84825--------------------------------------------------
Re: Sthil 031 AV.
DIR By: ray benson
Date: April 5, 2019, 8:04 am
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Check your messages for an ipl and service manual
#Post#: 84826--------------------------------------------------
Re: Sthil 031 AV.
DIR By: trail twister
Date: April 5, 2019, 8:35 am
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Will do.
Thank you very much.
:D Al
#Post#: 84831--------------------------------------------------
Re: Sthil 031 AV.
DIR By: trail twister
Date: April 6, 2019, 7:09 am
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Been reading how to expose the cylinder and also reading a
couple different replacement cylinder reviews.
Is there any certien company that stands above the others?
:D Al
#Post#: 84832--------------------------------------------------
Re: Sthil 031 AV.
DIR By: Al Smith
Date: April 6, 2019, 8:31 am
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They are kind of an odd ball and I've only ever seen two of them
.One I tuned for a neighbor and one in the dead pile at a
dealers .They are only 48 cc's so you can't expect much out of
them .
A little trick to unstick one is first letting them soak in some
type of penetrating oil for a while.Then if it's stuck above
the ports use the threaded part of a spark plug and braze in a
grease zert and use a grease gun full of oil to hydraulically
move the piston .A standard grease gun puts out about 5,000 PSI
so it will either come or bleed .You only have to move the
piston about 1/8 of an inch to free it .Unbolt the cylinder
first in case it's stuck on the bearings .
Something like this a dealer really doesn't want to deal with
.At most likely at least 60 bucks an hour it won't take long
before the repair bill would far exceeded the value of the saw
.Which is not to say it can't be DIY because I do it all the
time.All this said if you do get it running it will cut wood it
just won't be very fast .---good luck---
#Post#: 84833--------------------------------------------------
Re: Sthil 031 AV.
DIR By: Al Smith
Date: April 6, 2019, 8:47 am
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Here's another trick .I had a guy give me a McCulloch 700 with a
bad recoil he found in a dumpster ,bar ,chain and every thing
.Stuck tight as a bulls butt in fly time .I gave it the Kroil
treatment and after about a week used a hardwood block and a
little ball peen and gave a few light taps on the flywheel every
day or so .After about a week it freed up .Rebuilt the cab,fixed
the recoil and never did another thing else to it and it runs
like a top .
#Post#: 84834--------------------------------------------------
Re: Sthil 031 AV.
DIR By: trail twister
Date: April 6, 2019, 12:01 pm
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Thanks Al I will be doing the work as it was my dads. Other wise
I would scrap it out. Never really impressed me back in the day.
I have a Husky 55 EPA is right around 50CC's and it impresses me
a lot more.
:D Al
#Post#: 84853--------------------------------------------------
Re: Sthil 031 AV.
DIR By: Al Smith
Date: April 12, 2019, 6:00 am
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You have to remember when these things were made ,1971 and 48 cc
.I looked at the parts list and it shows both points type
ignition plus two types of solid state trigger units .I would
guess on the points some where between 18 to 20 thou. gap .Tight
would fire late and wider would fire early .Most Stihls are set
to fire around 27 thou before top dead center.A couple degrees
advance might pep it up some but too much you'd have a hard time
starting it .
Just about any saw can be enhanced to preform better ,just
depends on how much you want to do to them .On any engine you
have to remember if the exhaust can't get out the fuel and air
can't get in .So you start with the exhaust .That saw does not
show a two piece muffler so in order the rework the muffler it
could be a problem .In order the cut the baffles out you have to
cut the muffler cover off and weld or braze it back on .Not
doing that perhaps enlarging the exit hole would help just don't
get carried away with it .Hugely bigger is not always better
.You are safe if you don't go any larger on the hole than about
80-85 percent of the area of the exhaust port .After that it
just gets louder with no or very little gains and take a chance
of cooking the piston because it's over running the carb .On the
other hand if you just want to make it run just leave things
alone .Which is probably what I would do . Good luck
#Post#: 84855--------------------------------------------------
Re: Sthil 031 AV.
DIR By: trail twister
Date: April 12, 2019, 7:08 am
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Just want to get dads old saw back running. Not really wanting
to modfy it at all. I have it soaking right now.
I see where they were changeing the ones with points to a
module. I have not shopped to see if they still sell a module or
not but that I think would be the way to go I bet.
Thank you for all the information.
:D Al
#Post#: 84856--------------------------------------------------
Re: Sthil 031 AV.
DIR By: Al Smith
Date: April 12, 2019, 11:57 am
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If the IPL is correct it shows a couple of plugs in the flywheel
which I assume is for access to the points .If it does indeed
have points about the only thing that would go wrong usually
would be the points themselves need burnished and set .It might
even have spark once you get it shook loose .
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