Author Topic: McCulloch oil pump problem  (Read 7981 times)

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Offline qwerty12

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Re: McCulloch oil pump problem
« Reply #20 on: April 08, 2013, 06:34:20 am »
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

Offline qwerty12

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Re: McCulloch oil pump problem
« Reply #21 on: April 08, 2013, 08:07:16 am »
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

Offline 660magnum

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Re: McCulloch oil pump problem
« Reply #22 on: April 08, 2013, 08:20:07 am »
Check valve not working in pump
We should share what we know... someone may learn...
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Offline brokenbudget

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Re: McCulloch oil pump problem
« Reply #23 on: April 08, 2013, 08:48:42 am »
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.
when I grow up, i wanna be an adult.

Offline qwerty12

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Re: McCulloch oil pump problem
« Reply #24 on: April 08, 2013, 11:37:56 am »
here is a little video....
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
http://www.youtube.com/watch?feature=player_embedded&v=PystUCstQ28

Offline Al Smith

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Re: McCulloch oil pump problem
« Reply #25 on: April 08, 2013, 05:51:54 pm »
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 .

Offline qwerty12

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Re: McCulloch oil pump problem
« Reply #26 on: April 08, 2013, 06:01:24 pm »
dont know what model it is has no letters on the chainsaw at all only on the chainbar it saids mcculloch

Offline brokenbudget

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Re: McCulloch oil pump problem
« Reply #27 on: April 08, 2013, 06:07:46 pm »
like i said al, it's a pm380 on up tp a titan 430.
he needs a new one of these:
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.
when I grow up, i wanna be an adult.

Offline brokenbudget

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Offline qwerty12

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Re: McCulloch oil pump problem
« Reply #29 on: April 08, 2013, 06:35:46 pm »
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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