McCulloch Chain Saws

[promac850]

Bout' time to link in here...

http://www.arboristsite.com/chainsaw/71126-250.htm#post2493567

Oh dear...

 

[8433jeff]

They are yellow and black. They were not something painted yellow and black, were designed by Mac engineers to do a job they did well.
Some a long time, some a short while. Mac was cutting edge for a long time, and here they were on that edge, the disposable saw like white on rice.
But thats not how they were marketed, and I don't think designed.
Think Chevette in the car realm.

 

[Brian13]

Why no love on my oil pump question tonight

I looked at the IPL and see no way to solve the issue without tanking the tank off. Is all that keeps the oil pump piston from leaking back an oring? and a tank gasket? from what I am seeing.

Also the IPL shows a two gaskets and a spacer for the top removable part of the oil pump and I do not recall seing a spacer in mine just on gasket that has pulled all apart

Could the stuffer be rotted thru? Any oil leaking past the pump piston would be miniscule. Possible the gasket around the pulse port is blown out. But then the saw would have to be upside down or nose up to fill the case with oil. Taking the oil tank off is extremely easy. In fact, if have to get at the oiler, I would rather pull the oil tank than fight that fuel tank.

Chris B.

I agree with cbfarmall. Take the oil tank off, and pull the stuffer and see what is going on. Every saw I have taken apart that has sat for some time the stuffer is always covered in crud anyways, and should probably be cleaned. From there you can pull the oiler off and see what is going on. But my bet is on a crack in the stuffer like cb said.

 

[struggle]

Could the stuffer be rotted thru? Any oil leaking past the pump piston would be miniscule. Possible the gasket around the pulse port is blown out. But then the saw would have to be upside down or nose up to fill the case with oil. Taking the oil tank off is extremely easy. In fact, if have to get at the oiler, I would rather pull the oil tank than fight that fuel tank.

Chris B.

I will remove the tank this evening and see what is going on. The fuel tank really needed to come off anyway as it is cracked and a close look at the intake boot seems like a must do thing since parts are so hard to come by on these saws. I would hate to risk getting everything right and find out the intake boot burned the piston.

I agree with cbfarmall. Take the oil tank off, and pull the stuffer and see what is going on. Every saw I have taken apart that has sat for some time the stuffer is always covered in crud anyways, and should probably be cleaned. From there you can pull the oiler off and see what is going on. But my bet is on a crack in the stuffer like cb said.

I am feeling the love now. Group hug for the responses everyone
The plan is to keep this beast once running so I can terrorize the neighborhood with it:hmm3grin2orange:

 

[promac850]

I will remove the tank this evening and see what is going on. The fuel tank really needed to come off anyway as it is cracked and a close look at the intake boot seems like a must do thing since parts are so hard to come by on these saws. I would hate to risk getting everything right and find out the intake boot burned the piston.



I am feeling the love now. Group hug for the responses everyone
The plan is to keep this beast once running so I can terrorize the neighborhood with it:hmm3grin2orange:

That's it right there... put on that Jason hockey mask and go chase little kiddies and big babies, make them piss their pants...

 

[cbfarmall]

Just finished putting the mains and seals in my Super 250 (2nd from the top). Pulled all my 250s and 550s together for a little picture. I love this series of saws.

BTW, the clutch keyway on the crank was totally shelled out. As in 1/3 of the taper was gone. No chunks and no woodruff key fell out when I pulled the clutch. I did replace the drum on this saw when I got it and I don't recall any damage so I have no idea what happened. Anyway, the only 87cc junker I had was a 440 and the crank did bolt into the Super. Crank counterweights looked a tad less beefier is all I could see different.

Chris B.

 

[promac850]

Alright, the parts I need are listed below:

Entire tank assembly, not including air filter cover, but including the air filter and related mounting hardware. (parts 5-54 on 790 IPL, pg 4; parts 5, 8, 13, 23, and 36-41 would be bonuses and should be coming in from CPR, IIRC)

Front handle and all related mounting hardware. (parts 1-12 on IPL, pg 2)

Oil tank and all oiler components, and mounting hardware. (parts 51-53 on pg 2, and 1-40 on pg 8)

.404 pitch clutch drum, part #51774B, or better yet, a suitable rim drive drum, so only a .404 rim has to be changed when it wears out.

Case O-ring, part #104523

Will add more, gonna go check on some details a minute.

 

[struggle]

I removed the tank on the SP125 and pretty much found nothing real obviously wrong other than a bunch of crud in the bottom of the tank.

The gasket to wards the oil tank is mush and shredded when I pulled the tank off. I will try and get both gaskets.

I am thinking now that there must be a problem with the oil pump itself that it allowed oil to be pulled while running as I see no way that it did it while sitting still over the years unless I am missing something obvious.

I will clean everything up and inspect closer on the oil pump itself. The manual oiler worked I know prior to tank removal. Internally the saw looks like new and such my be the result of it being full of oil which was not such a bad thing over the years while sitting waiting for me to gently bring it back to life:hmm3grin2orange:

 

[promac850]

Alright, the parts I need are listed below:

Entire tank assembly, not including air filter cover, but including the air filter and related mounting hardware. (parts 5-54 on 790 IPL, pg 4; parts 5, 8, 13, 23, and 36-41 would be bonuses and should be coming in from CPR, IIRC)

Front handle and all related mounting hardware. (parts 1-12 on IPL, pg 2)

Oil tank and all oiler components, and mounting hardware. (parts 51-53 on pg 2, and 1-40 on pg 8)

.404 pitch clutch drum, part #51774B, or better yet, a suitable rim drive drum, so only a .404 rim has to be changed when it wears out.

Case O-ring, part #104523

Will add more, gonna go check on some details a minute.

Here are more:

Bar nuts and washers, part #103729 and #100006... cuz I like original.

Clutch cover and spark arrester shroud (parts 45-50 on pg 2)

All of the pushrods for the handle (parts 19-21 on pg 14) Part #53583A, #51857B, and #61907

Bar protector plates, both LH and RH, part #61995 and #61996

****
Two things that would make this the cat's ass would be a lightly worn vintage bar, either 24" #51405A or 30" #51409A... or any old bar of vintage that would really pull off 'the old logging saw' look.

Another thing for making the cat's ass even more awesome would be a McCulloch Scrench, part #51445A

All help is greatly appreciated and shall be rewarded at a later date in some way.

 

[promac850]

I removed the tank on the SP125 and pretty much found nothing real obviously wrong other than a bunch of crud in the bottom of the tank.

The gasket to wards the oil tank is mush and shredded when I pulled the tank off. I will try and get both gaskets.

I am thinking now that there must be a problem with the oil pump itself that it allowed oil to be pulled while running as I see no way that it did it while sitting still over the years unless I am missing something obvious.

I will clean everything up and inspect closer on the oil pump itself. The manual oiler worked I know prior to tank removal. Internally the saw looks like new and such my be the result of it being full of oil which was not such a bad thing over the years while sitting waiting for me to gently bring it back to life:hmm3grin2orange:

That's the upside of that bar oil leak... it saved the inside of the saw's most important part... the engine.

When are you gonna post pics? I wanna see it all torn apart and how you got it and stuff like that.

 

[struggle]

That's the upside of that bar oil leak... it saved the inside of the saw's most important part... the engine.

When are you gonna post pics? I wanna see it all torn apart and how you got it and stuff like that.

Tomorrow or Monday I can get some pictures of it with where I am at with it now.

I was asked today by DW how many saw do you have now:msp_confused: time to lay low for a bit

 

[Rounder]

895 Update

Picked it up this morning and the rear handle broke at the bolt. ####. Oh well. This saw has had some use.
View attachment 181197

Corroded SOB, hasn't penetrated the surface as far as I can see.

View attachment 181198View attachment 181199

Should look good here when it's done...at least when it's not tagging along to work with me - Sam

View attachment 181200


-Happy Easter-

 

[struggle]

Picked it up this morning and the rear handle broke at the bolt. ####. Oh well. This saw has had some use.
View attachment 181197

Corroded SOB, hasn't penetrated the surface as far as I can see.

View attachment 181198View attachment 181199

Should look good here when it's done...at least when it's not tagging along to work with me - Sam

View attachment 181200


-Happy Easter-

At least there is a little metal left:msp_scared:

 

[Brian13]

Picked it up this morning and the rear handle broke at the bolt. ####. Oh well. This saw has had some use.
View attachment 181197

Corroded SOB, hasn't penetrated the surface as far as I can see.

View attachment 181198View attachment 181199

Should look good here when it's done...at least when it's not tagging along to work with me - Sam

View attachment 181200


-Happy Easter-

Looks like you have some cleaning to do LOL. I might be able to help you with the handle though. I think I have an extra somewhere.

 

[Rounder]

Brian, if you have an extra, that would be great. I never really trust weld repairs on these saws.

Struggle, not as bad looking in person.
Brian raised the bar with his Super 250. The 895 ain't got #### on that thing.

 

[Brian13]

Thanks Sam!! Found it in the box I thought it was going to be in. This is it, its dirty but I think its the same one.

 

[heimannm]

It's been a busy few days.

Chris - I think the suggestions of faulty ground or simply a bad connection makes sense if everything else is right. Don't overlook the plug wire either, I have run into problems with plug wires more than a few times.

Jeff - Mini Mac's are the greatest saws ever designed or built. It is just that we lack the skills needed to service them...

Struggle - Make sure that the gaskets are sound, and go through the whole pump unit making sure the working parts are clean and that the check valves are working properly. I would try to replace the o-ring and make sure the piston washer and piston ring are in good shape.

Sam - I have had pretty good success bead blasting parts like the inside of the tanks to really clean them up. Don't be surprised to find some spots where it has corroded all the way through. piece of tape on the outside and JB weld on the inside works wonders.

Forgive me guys, my eyes don't want to stay focused any longer for any more catching up. I did run my 1-72 some more today cutting up a couple of ash trees that younger son Josh lined up for us. I really like that saw but wish it had an automatic oiler.

Mark

 

[8433jeff]

It's been a busy few days.
Jeff - Mini Mac's are the greatest saws ever designed or built. It is just that we lack the skills needed to service them...

Mark

:msp_lol::msp_lol::msp_lol: I do lack many things,, now I can add ability to the list. lol
If the price of gas goes up any further, I might not be able to attend the GTG, so how many do you want?
Promac is down for three, Eccentric needs one or two, somebody else needs three, I only have six or seven left. Get them before they are gone!

 

[Rounder]

Thanks Sam!! Found it in the box I thought it was going to be in. This is it, its dirty but I think its the same one.

Awesome, I'll pm ya, we'll figure something out. - Sam

 

[Rounder]

"Sam - I have had pretty good success bead blasting parts like the inside of the tanks to really clean them up. Don't be surprised to find some spots where it has corroded all the way through. piece of tape on the outside and JB weld on the inside works wonders."

Mark, the tape and JB is a great idea, thanks for the tip - Sam