McCulloch Chain Saws

[RolandM]

I have tried to different plugs, same results. The piston skirts are also different, they won't cover the intake port if they're backwards

Mark

Sounds like a worn piston is possible, intake side skirt clearance excessive. You have fixed / ruled out the air leaks and bad carb etc. Compression is not great. I had a Danarm which gave me a similar chase. I think you will be opening this one up.

Roland.

 

[2broke2ride]

Mark, I believe the piston to be in correctly. I had it totally torn down twice due to the leaking crank case parting line.
What about a slightly bent connecting rod? If you remember, I changed the piston due to a small chunk missing from the crown of the original piston like it made contact with something.
I appreciate your efforts and am slightly relieved that I didnt overlook something stupid.

 

[2broke2ride]

Pictures of the original piston.

 

[Timdog]

What caused that

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[2broke2ride]

I do not know. The saw came to me like that and I never ran it prior to complete tear down and rebuild. I did not find anything amiss to indicate what may have been the cause.

 

[Timdog]

I just got a Mac 15 that's just like that I assume someone tried to use a screwdriver as a piston stop just wondering if it could have been something else

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[Maintenance supervisor]

Should I swap this muffler out for a later model?
Fyi the saw dosen't run yet just picked it up today and haven't seen a muffler like this.

 

[Jethro 2t sniffer]

View attachment 732846
Should I swap this muffler out for a later model?
Fyi the saw dosen't run yet just picked it up today and haven't seen a muffler like this.View attachment 732847

Just open it up a bit or add another slot or two. It's a fairly big outlet on a pm10-10 in comparison.

 

[Maintenance supervisor]

Just open it up a bit or add another slot or two. It's a fairly big outlet on a pm10-10 in comparison.View attachment 732860

Haha lizards will get in that! I might do that except for a screen cover also.

 

[Jethro 2t sniffer]

Haha lizards will get in that! I might do that except for a screen cover also.

Yea its deflector is broken it's not normally that large but I'd just cut a slot and bend it open a bit and Bob's your auntie

 

[fossil]

Haha lizards will get in that! I might do that except for a screen cover also.

Out of curiosity, does that 10-10 have an auto oiler?

 

[PogoInTheWoods]

Should I swap this muffler out for a later model?

I'd leave it, myself. Maybe open it up a hair as suggested. Different mufflers among the 10-10's tend to lend a certain degree of distinction to each one if you happen to end up with a few of em (like some of us have..., or will). LOL

 

[Timdog]

Don't all the 10-10s have the auto Oiler

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[PogoInTheWoods]

Just the B's, D's, amd F's according to the 1970 10-10 and 10-10A master IPL..., with the 'A's being the B, D, and F models. Of course there always seems to be an exception somewhere in the mix.

 

[Jethro 2t sniffer]

Haha most of my macs are manuel only lol or dribble a little. I've given up playing with the adjusters

 

[fossil]

I have a RH start model with no auto oiler. Too old to have a tag in the box or it's missing. My 2-10 has a tag but it's attached to the tank hold down screw, rear center in the carb box. No rivets.

 

[Jethro 2t sniffer]

That's a different looking starter Tim

 

[fossil]

Yes. Export saws and old 10-10's. There's a picture of one in the 10 series repair manual.

 

[Jethro 2t sniffer]

Yes. Export saws and old 10-10's. There's a picture of one in the 10 series repair manual.

Ahh right that's interesting

 

[PogoInTheWoods]

Did that roller nose come with the saw, Tim? Definitely a nice touch!