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#Post#: 18859--------------------------------------------------
Re: McCulloch oil pump problem
By: qwerty12 Date: April 8, 2013, 5:34 am
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Trhe rubber seams fine to me it has no cracks etc
the problem is I live in small town and at local saw shops there
are not anny McC part aviable :-\ eslwhere I would buy whole
new pump this one is giving me headaches
#Post#: 18862--------------------------------------------------
Re: McCulloch oil pump problem
By: qwerty12 Date: April 8, 2013, 7:07 am
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I noticed one strange thing today.
Carb was hard to adjust...saw smokes much. when turned carb
screws clockwise saw would strive and die. so i made it H and L
for biggest rpm and stil god smoke.
Afther that i pour out chain oil and remowed oil pump. turned
saw on and pressed trottle. no smoke and fine rews.
that means that oil pump instead of giwing oil on chain is
returning oil to the crankcase so the saw consumes it. gowd damn
it i have a 4 stroke chainsaw lubricates from oil pump oil ;D
what could that mean ???
@budget...rubber gasket seams ok to me no cracks
#Post#: 18863--------------------------------------------------
Re: McCulloch oil pump problem
By: 660magnum Date: April 8, 2013, 7:20 am
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Check valve not working in pump
#Post#: 18864--------------------------------------------------
Re: McCulloch oil pump problem
By: brokenbudget Date: April 8, 2013, 7:48 am
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660, i thought that as well, but he said he 'bench' tested it
and it worked.
querty, the rubber may seem ok, but over time it looses its
elasticity (rubberyness ;), and won't squish enough to seal. and
i'm pretty sure that's the problem as to why it won't oil. with
the lower cover gasket and the upper rubber one squished into
their shape and thickness you are not getting the clamping force
to stop the leak. this is also why it is smoking badly as the
oil is getting past the bottom gasket and into the engine
through the impuls port.
way back when i was working at bentons farm equipment, we sold
quite a few of those little saws (in titan colors- yours is
probably a pm380) and when ever you touched the oiler on them,
they recieved a new upper rubber grommet and cover gasket. no
questions asked.
make a new thicker gasket for the bottom cover and and flip the
grommet over to see what happens.
#Post#: 18866--------------------------------------------------
Re: McCulloch oil pump problem
By: qwerty12 Date: April 8, 2013, 10:37 am
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here is a little video....
HTML http://youtu.be/uki-IxWaKk4
in diesel can its not pumping fluids
I am beccoming totaly mad
at the end i will use this repair tool
HTML http://www.youtube.com/watch?feature=player_embedded&v=PystUCstQ28
#Post#: 18874--------------------------------------------------
Re: McCulloch oil pump problem
By: Al Smith Date: April 8, 2013, 4:51 pm
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I' m not certain exactly what model that thing is .I'd about
think with a vertical cylinder it would be one of the Italian
made Titans .I thought they all had crankshaft driven pumps ,not
impulse piston .
#Post#: 18875--------------------------------------------------
Re: McCulloch oil pump problem
By: qwerty12 Date: April 8, 2013, 5:01 pm
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dont know what model it is has no letters on the chainsaw at all
only on the chainbar it saids mcculloch
#Post#: 18876--------------------------------------------------
Re: McCulloch oil pump problem
By: brokenbudget Date: April 8, 2013, 5:07 pm
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like i said al, it's a pm380 on up tp a titan 430.
he needs a new one of these:
HTML http://oldmowerparts.com/McCulloch-235159-rubber-GASKET-OIL-PUMP-Power-Mac-380-430-Eager-Beaver-23-NOS-Part-New-OEM-Chain-S-P2375497.aspx
look at his grommet and then the one in the link. notice how the
grommet is shaped? it's squished beyond use.
the oil pump is basicly sandwiched between the ports in the top
of the oil tank and the bottom cover. and it needs to be a tight
fit. the rubber grommet and gasket is squished flat and the fit
isn't tight enough. so the pulse from the crankcase is bleading
off into the oil tank, while the oil is being sucked into the
crankcase.
if he'd take a small amunt of time and do this right, he'd have
a good little saw to run.
#Post#: 18877--------------------------------------------------
Re: McCulloch oil pump problem
By: brokenbudget Date: April 8, 2013, 5:08 pm
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MCCULLOCH PM 380 ON UP TO TITAN 440.
HTML http://www.acresinternet.com/cscc.nsf/ed1d619968136da688256af40002b8f7/16d9fed8dd1b2ad488256c2f001b6b7a?OpenDocument
HTML http://www.acresinternet.com/cscc.nsf/ed1d619968136da688256af40002b8f7/7cda4efda9b4529388256c2f001bcf1e?OpenDocument
i guess the american market went up to the 440.
#Post#: 18878--------------------------------------------------
Re: McCulloch oil pump problem
By: qwerty12 Date: April 8, 2013, 5:35 pm
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I will make new gasket tomorow that is thiner than original so
the pump is pushed harder to the crankcase maybe it wont leak
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