MCCULLOCH The official McCulloch thread

[edju1958]

I had heard those were pretty nifty Ed.
Only 57 cc ive dealt with is a 1010S.
Think ive got three of those.
I like them over a 1010A for better torque.
1010A is a bit lighter in hand though.
PM55 compared to a PM1010S seems to be a bit like a 7-10A compared to a PM700.

I'd compare the 10-10S to a PM610 McBrick & the PM55 to a 10-10A weight-wise.Throw a 20 in.bar on the PM55 & you've got a demon of a saw!

 

[heimannm]

The PM55 and the 7-10 are noticeably better than the 10-10S and the PM700 both weight wise and performance wise. The short clutch covers, even with a brake and much lighter and make the saws that much more nimble.



I may be slightly prejudiced.

Mark

 

[Squareground3691]

The PM55 and the 7-10 are noticeably better than the 10-10S and the PM700 both weight wise and performance wise. The short clutch covers, even with a brake and much lighter and make the saws that much more nimble.

View attachment 404289

I may be slightly prejudiced.

Mark

Take 7-10 all day ,

 

[fossil]

 

[Yukon Stihl]

View attachment 404465

Love the protective gear back then...

 

[bogieboy]

Out of curiosity, as i really need to thin the herd, what would be a fair price to ask for a running mac 1-10? With the gamut of newer stihls that i have, i have no need for this saw, and as you can see it has been collecting dust LOL

I still need to go thru the carb to verify that the duckbill valves are good to go, but i got it running this week again... scary how loud this is, its louder than a ported and muff modded ms661....

 

[jacob j.]

View attachment 404465

Rich Dougan had an original copy of that picture he'd gotten from Jeri hanging on the wall of his shop for many years.

She was a long time customer at the shop and Rich went to school with her son.

 

[heimannm]

Last week...







New piston assembly, wrist pin, crankshaft seals, PTO side bearings, gaskets, flattened the front of the oil tank (badly worn, would not seal), rebuilt the starter with a new spring and installed the missing retaining ring. Fired right off on a prime...

It went downhill after that...if you haven't had one apart, the fuel tank top does not have a full channel like the other models so the gasket "squishes" out when you tighten the top down. I ended up giving it the Red Kote treatment to solve the fuel tank leaking issues but discovered the carburetor body and throttle shaft were badly worn making tuning impossible, I did find another SDC2 in better condition so we'll see what happens once the Red Kote fully cures.



Mark

 

[heimannm]

I did learn a good (not necessarily easy) way to install the screen in the oiler pick up hose, just roll the edges back, lay the screen in there, and roll it back again. This was on the PM10-10 I did before the 6-10.





Mark

 

[heimannm]

Max AKA Knightmax was asking about some oiler parts and sent me down a bit of a rabbit trail. In the end I concluded there were 4 different part numbers for the pulse pump (automatic oiler) on the large frame saws and in the end, they can all be used interchangeably.

60253, 67917, 83135, 89498





Aside from the pump body differences, the other variations were pretty minor, different adjuster screws, different part numbers for the sleeve and ring, and some mounting hardware differences. The only difference between 83135 and 89489 shown above are the adjuster screw and mounting hardware. I guess McCulloch was confused as well, as both of those came from factory packaging as 89489 yet one is painted and has a hex adjuster screw, the other is bare aluminum and has the set screw with lock nut.

The investigation of the pumps led me to look through the gaskets I have and try to determine what is what. From the various IPL's I came up with a list of gasket numbers (60264, 61473, 62338, 65668, 65673, 68794, and 86186) and tried to then determine what I actually had.

Here's a start:



As you may imagine, having parts come from multiple sources over 10 years or so, there was a lot of confusion on the real part numbers.

The same pumps are used on the later 450 and all 550 model front tank saws, but use a different gasket. With the gasket PN and a fuel tank to look at, I could determine that 62338 is in fact the only gasket that will work with either pump on those front tank saws.



I also confirmed that all of the top tank saws have the same mount for the oil pump. Shown L-R the rigid saws, CP, and SP type oil tanks.



Mark

 

[heimannm]

60264 is the only gasket that actually matches the contour of the 60253 pump.

62338 is the only gasket I actually have that will work on the front tank saws, but I see that 65673 is listed for the later 550 models so it must also look like 62338.

Early models used only one gasket between the oil tank and the pump.

Later models used two gaskets and a spacer (why???). There were even two different spacers, one magnesium and one steel.



I have yet to determine what 61473, 65668, and 65673 actually look like, and what are the two rubber gaskets that look most like 60264?

380A and early 450 use a different pulse pump built into the bottom of the fuel tank

440 uses 60253 Pulse Pump and 60264 gasket

Late 450 uses 60253 Pulse Pump and 62338 gasket

Early 550 (PN63450) uses 60253 Pulse Pump and 62338 gasket w/60601 fuel tank gasket (crankcase bottom)

Mid 550 (SN10-, 11-) uses 67917 Pulse Pump and 65673 gasket w/65669 fuel tank gasket (crankcase bottom)

Mid 550 (SN11A-, 12-) uses 83135 Pulse Pump and 65673 gasket w/65669 fuel tank gasket (crankcase bottom)

Super 550 (SNA12-, 13-) uses 83135 Pulse Pump and 65673 gasket w/65669 fuel tank gasket (crankcase bottom)

740 use 60253 Pulse Pump and 60264 gasket

790 uses 60253 Pulse Pump and (2 ea) 61473 gaskets with 61472 spacer (square hole)

795 uses 67917 Pulse Pump and (2 ea) 68794 gaskets with 67471 spacer (square hole)

797 uses 67917 Pulse Pump and (2 ea) 61473 gaskets with 67471 spacer (square hole)

S797 uses 83135 Pulse Pump and (2 ea) 68794 gaskets with 67471 spacer (square hole)

PM105 uses 83135 Pulse Pump and (2 ea) 86186 gaskets with 67471 spacer (square hole)

CP125/S uses 83136 Pulse Pump and (2 ea) 68794 gaskets with 67471 spacer (square hole)

SP105 uses 83135 Pulse Pump with 86186 gasket (pump side), 67471 spacer, 68794 gasket (tank side)

SP125 (SN 10-) uses 83135 Pulse Pump and (2 ea) 68794 gaskets with 67471 spacer

SP125 (SN 11-, 12-, 13-, 14-, 15-) use 89498 Pulse Pump with 86186 gasket (pump side), 67471 spacer, 68794 gasket (tank side)

My poor brain is getting tired.

If anyone has input on additional part numbers, or can explain why some models had two gaskets and a spacer, I'd love to know more.

Mark

 

[heimannm]

From the 740 IPL



From the S797 IPL




From the '77 SP125 IPL



Mark

 

[edju1958]

Mark,if I were sorting through all that oil pump & gasket business,I'd be in a rubber room.

 

[jacob j.]

Max AKA Knightmax was asking about some oiler parts and sent me down a bit of a rabbit trail. In the end I concluded there were 4 different part numbers for the pulse pump (automatic oiler) on the large frame saws and in the end, they can all be used interchangeably.

60253, 67917, 83135, 89498

View attachment 405043

View attachment 405045

Aside from the pump body differences, the other variations were pretty minor, different adjuster screws, different part numbers for the sleeve and ring, and some mounting hardware differences. The only difference between 83135 and 89489 shown above are the adjuster screw and mounting hardware. I guess McCulloch was confused as well, as both of those came from factory packaging as 89489 yet one is painted and has a hex adjuster screw, the other is bare aluminum and has the set screw with lock nut.

The investigation of the pumps led me to look through the gaskets I have and try to determine what is what. From the various IPL's I came up with a list of gasket numbers (60264, 61473, 62338, 65668, 65673, 68794, and 86186) and tried to then determine what I actually had.

Here's a start:

View attachment 405046

As you may imagine, having parts come from multiple sources over 10 years or so, there was a lot of confusion on the real part numbers.

The same pumps are used on the later 450 and all 550 model front tank saws, but use a different gasket. With the gasket PN and a fuel tank to look at, I could determine that 62338 is in fact the only gasket that will work with either pump on those front tank saws.

View attachment 405047

I also confirmed that all of the top tank saws have the same mount for the oil pump. Shown L-R the rigid saws, CP, and SP type oil tanks.

View attachment 405048

Mark

This is great information Mark - Thank you. I've never even seen the 60253 style pump, only the 89498 style pumps. I do have different types of gaskets for the pulse pumps so now I should be able to figure out what they fit. They came with a large lot of stuff I bought from a retired dealer in 2005.

 

[legdelimber]

Do any of the oil pump and gasket sets change at a given serial number or other production or batch identifier?

Working in machine/fabrication shops, I saw a few "glitches" get through the system.
Once saw where (a portion of) the blueprints got reversed/mirrored, somehow, during the trip from the Engineers desk to the printing shop. Was a large printing press frame.
Then there were some textile parts (castings no less) that we cut spacer plates for, in order to cope with a customer math error.
I've seen fixtures with blind corners that trapped swarf and held parts a bit "proud" and caused some scrap metal to happen.
I've reworked tooling in a couple of places. Subtlety changed banking points to not have any more blind corners that would catch weld spatter, saw crud or a burr and cause miss-locations so readily.
You just never know what small stuff happened, that will live with us for a long time.

And yes, I left my oopsies along the way too. Ya just find a few more repair tricks in the processes. right?

 

[heimannm]

leg - if you look at the list in post 9,851 you will see on the 550 models in particular they seemed to change the pump and gasket PN's with each year of production.

I suppose if I had more IPL's for the different models I may discover even more variations, I guess I should be relieved that I only have a representative sample of all the documents McCulloch may have published.

I did edit post 9,851 as I realized from the list that some 550 models use gasket 65673 rather than 62338 so they must be similar...

Mark

 

[cinci5]

Putting the SP125 back together and was wondering why a stepped area around the exhaust gasket section.
I made a copper gasket on the CNC Mill to fill in but why is there a step there to begin with.

 

[heimannm]

The OEM gaskets fit over those two "projections" and lay flat against the cylinder.



I think part of the idea on that large gasket is to form a sort of heat shield between the muffler and the cylinder.

You will see more clearly on Saturday...

Mark

 

[cinci5]

The OEM gaskets fit over those two "projections" and lay flat against the cylinder.

View attachment 405103

I think part of the idea on that large gasket is to form a sort of heat shield between the muffler and the cylinder.

You will see more clearly on Saturday...

Mark

I understand it just doesn't make any sense, but some of the things that got done also don't.
Why not a flat surface to absorb more heat into the say aluminum or copper heat shield/gasket something like Stihl.
Oh well thanks

 

[Rallyeguy]

Putting the SP125 back together and was wondering why a stepped area around the exhaust gasket section.
I made a copper gasket on the CNC Mill to fill in but why is there a step there to begin with.

Hi Jeff,

I would assume that small raised line cast into the cylinder is to create a pressure or crush point on a soft gasket. My Printing company screen prints silicone beading on gaskets for local gasket companies and this is used to help seal better than a gasket alone by creating this high pressure "ridge".

I don't see a step so much as a raised "row" of material that would essentially do the same thing.

Brian Genrich
Old Saw Shop