Author Topic: McCulloch oil pump problem  (Read 7893 times)

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Offline brokenbudget

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Re: McCulloch oil pump problem
« Reply #40 on: June 15, 2013, 08:28:48 pm »
looking at another thread on another site, i think you're missing a ball and spring. it would be the "other" check valve.
notice the "large" spring. right beside it, notice the ball. under that ball is a spring. seems yours is missing.


edit: thought i put this pic in :)
seems the little ball is missing :( not where the arrow is pointing.

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Offline Cut4fun .

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Re: McCulloch oil pump problem
« Reply #41 on: June 15, 2013, 08:49:40 pm »
1st time I have looked at this thread. Nice work guys and Great translation work 660mag..............................................

Way to go the extra mile. 




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Offline brokenbudget

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Re: McCulloch oil pump problem
« Reply #42 on: June 15, 2013, 08:52:51 pm »
i just hope he can find a suitable ball and spring to replace the missing parts. these little macs are actually pretty good runners.
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Offline Al Smith

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Re: McCulloch oil pump problem
« Reply #43 on: June 15, 2013, 09:20:04 pm »
Sorry I couldn't add anything for the simple fact I've never even seen that model nor that type of pump .

Offline brokenbudget

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Re: McCulloch oil pump problem
« Reply #44 on: June 15, 2013, 11:47:00 pm »
it's basicly the same pump, but the italians decided to help mcculloch's design along with a more reliable check valve design. the last time i was into one of these was back in the mid '90's. some of the info has fallen out of my head, but from what i remember, they were a good unit. the only problems were loose screws causing the cloud of death or a no oil to the bar situation. or like the saw the oiler picture is from, somebody drops them hard and they crack the oiler mounting pad. it takes luck for that to happen. need to hit it just right.
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Offline Al Smith

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Re: McCulloch oil pump problem
« Reply #45 on: June 16, 2013, 07:29:31 am »
Well that check valve business it's a known fact that a lot of the 10 series saws had slight failures as they aged . Danged things would suck bar oil back into the crankcase and smoked .Usually not a problem after they had ran a while .In extreme situations though they could flood the cylinder and drown the plug .

If not that bad extended usage on a bottom exhaust 10 series with the screens and baffles in place could lead to pyralized oil carboning up the exhaust port which chewed the piston to pieces given enough time .Good oilers if not for that problem .

Offline brokenbudget

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Re: McCulloch oil pump problem
« Reply #46 on: June 16, 2013, 08:25:05 am »
i've had my share of 10-10's, 700's, 850's etc. with bad pumps. i'm a guy that has no problem drop starting an 088 without the decomp, but when one of those 10 series had any type of oil in them they just wouldn't budge :) of course, it was always when you never expected it so you'd just grab on that pull handle to give her a twist only to find out in a spit second how painful it can be when that cord don't want to come out. can't tell you how many times i've either broken the cord, handle or pulled that handle out of my hand over extending a couple few fingers in the process. damn near make me want to cry like a baby. and them fingers are frikin sore for the rest of the day and week.
good thing today most saws have extrenal pumps and can't really ingest chain oil. i don't think the starters would be up for the abuse.
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Offline Al Smith

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Re: McCulloch oil pump problem
« Reply #47 on: June 16, 2013, 09:03:15 am »
I had an SP-81 close the decomp prematurely on a drop once and climbed the cord .Scared me to death and that's the last time I ever tried that . It that SOB would have started it could have cut my arm off . :o

Offline brokenbudget

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Re: McCulloch oil pump problem
« Reply #48 on: June 16, 2013, 09:48:39 am »
naw she just wanted to cuddle :) and give you love nips ;D
had an old sp-81 that would break it's own pull cord quite often when you shut it down. tried to hold the cord out a few inches once (only once) to see if it helped. i figure she would just love to keep running in reverse if there wasn't anything there to stop it from happening. that saw was a nice easy starter, loads of go and a nice smooth idler. never looked at the points to see what was up, ran too good and didn't have it long enough. got sold on me by mistake when i brought it in to work one day to show john (owner of bentons farm equipment), he wasn't there that day and i was helping the neighbor with some haying, long story short, pete, the other mechanic (very close to retirement at the time and long since dead now, gawd rest his awesome soul),didn't know it was mine as i didn't have a tag on it saying so. and it was in the tree with other saws for sale, sold it to somebody that came in looking for such a saw for some dirty clean up, no price, but that's ok. we'll sell it to you for the same price as the similar saw above and call it good. thank you have a nice day :)
i wasn't mad, honest mistake totally brought on by my own dummass. i did make an extra 40bux ;D and never ever seen it again.

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Offline Al Smith

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Re: McCulloch oil pump problem
« Reply #49 on: June 16, 2013, 11:22:50 am »
There is a very fine line on the points type 10 series saws .If you get just the right amount of advance they run like a scalded ape .Too much they try to break your wrist .

They don't have a very large starter drum .The little ones like the 10-10 aren't bad but 70 cc and larger just the compression alone can hurt you .

On the oilers though I've had some leakers none really were that bad on this style of pump .Now the diaphragm type impulse pumps on the later PM 610-650 will cause lots of problems .Those will hyraulically lock up a cylinder to the point you can't pull them over . You have to blow the oil out to even get them to roll over .

 

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