Author Topic: McCulloch pulse oiler  (Read 723 times)

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Offline Al Smith

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McCulloch pulse oiler
« on: June 27, 2011, 08:09:44 pm »
I think I've got this thing figured out . It appears to me the oil inlet is on the right hand top hole in one of the pictures .It shares the same supply as the thumb oiler .

The outlet is on the right hand top of the picture ,shared again with the thumb oiler .Blurry pic,sorry .

The large fiber disc is exposed to the impulse of the saw and recipricates  thousands of  times minute .Evidently the pump portion is just a tiny little metal shaft from what I gather .A little drop each pulsation ,but a lot of little drops in a minute .

The output is governed by a set screw should in the pic of the oiler in place on the saw .It only allows the pump piston a certain amount of travel by resticting a plastic sleeve within the assembley and also houses the recoil spring for the pump .A couple of check valves also .

I suppose about the only thing that wouls cause it to suck bar oil into the crankcase would either be a leaking disc or a non sealing gasket which is rather hard plastic of some sort .

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Offline Al Smith

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Re: McCulloch pulse oiler
« Reply #1 on: June 27, 2011, 08:10:39 pm »
I couldn't get the other two pics in the first post .

Offline Al Smith

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Re: McCulloch pulse oiler
« Reply #2 on: June 27, 2011, 08:15:20 pm »
Now in spite of all my efforts that freaking saw is causing me fits .I had the damned thing runnng just a few days ago but it smoked like it was burning pine knots .Which I assumed to be sucking bar oil .I'll be damned if it didn't loose compression all the sudden .

I'll get to the bottom of it as soon as I have the time .I'm tellin ya you might think you know it all and have seen it all then along comes a danged saw and makes a monkey out of you . :-[

Offline brokenbudget

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Re: McCulloch pulse oiler
« Reply #3 on: October 09, 2011, 11:15:35 am »
al, those gaskets are supposed to be flexible rubber, not hard plastic. i've tried to make some gaskets but without the little raised lip around the surface they tend to leak and pull oil into the engine.
another place to watch out for on the 10 series saws is the 4 bolts that hold the tank to the cylinder. they are suppose to have either an aluminum or a firm fibrous gasket washer behind the heads to seal them. i can't remember how many times i have fiddled with the oiler thinking it was the culprit only to find out after hours of labour it was an easier fix than the oiler :D
when I grow up, i wanna be an adult.

Offline Al Smith

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Re: McCulloch pulse oiler
« Reply #4 on: October 09, 2011, 01:23:47 pm »
It's been some time since those original posts in this thread .I got tired of fiddling with the 805 oiler and put a one from a 700 in it's place . Problem solved .

However after all that I stuck the danged piston and now the 805 is basically an 850 in 805 clothing .The 850 has better chrome anyway so in essence it's a win .

McBob may debate it but factually Mac didn't do so good on the later chrome cylinders .If you think about it though those days with apartite or whatever it was called the hard Rhodision chrome was in short supply . The chrome started dissapearing from automobiles and if they did chrome them it wasn't very good stuff .Lawdy the bumpers from those years models Olds Cutlasses would about disappear in about 4-5 years .

 

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