MCCULLOCH The official McCulloch thread

[the 28inch mac man]

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Thanks Mark for the pics!

 

[Sloa]

Couldn’t shake the bad felling I was getting to seal this complete ,so avoiding for a number of years. Will still have 797 tank if I want to revisit. Same tank but a number of differences. No decomp fitting, d-port manifold. Also fitted with govener workings.

 

[edju1958]

Good news - I found my SP125 that I thought was stolen a few months ago.It fired right up after sitting for 2 1/2 yrs.We took it out today to drop a good sizerd oak that we'd been meaning to get for the past 2 yrs.It was a thunderous crash when it hit the ground.My son (Eddie) likes to fell trees & he's damn good at it too.As you can see in the pic the 125 just made it through the tree with a 36 in.bar.He started to cut the main stem,but the saw threw the chain because one basr stud nut got lost & the other nut was loose.Now I gotta see if I can find another nut.I hate losing my nuts,Lol.

 

[heimannm]

I like to use tall nuts (this Amazon lister calls them high nuts) for bar nuts on the large frame saws.

Amazon.com

I'd ask how you can lose an SP125 but I know I misplaced one in my shop recently, I remembered where I put it a week or two later...

Mark

 

[heimannm]

I'm trying to get this 7-55 ready for the Master Mind GTG in a couple of weeks. Starts with good cleaning...





Uncovered a couple of issues that required further disassembly.



If you are not familiar with the older McCulloch two man saws, they included some "syncro gears" to reduce vibration. I will get some better photos during the reassembly.



I needed several gaskets in addition to the crankcase seals, good news was I have everything on hand. Bad news is the gaskets have dried out and shrunk over the years (paper gaskets) so I have them soaking in my part washer solvent in the hopes they will swell up enough to allow me to continue assembly on Monday.

Mark

 

[Sloa]

Is common sponge the stuff I use at work fine for the spit back collection. Seemed to absorb and evaporate out in test piece. Is there a particular product/name.

 

[Sloa]

Good news - I found my SP125 that I thought was stolen a few months ago.It fired right up after sitting for 2 1/2 yrs.We took it out today to drop a good sizerd oak that we'd been meaning to get for the past 2 yrs.It was a thunderous crash when it hit the ground.My son (Eddie) likes to fell trees & he's damn good at it too.As you can see in the pic the 125 just made it through the tree with a 36 in.bar.He started to cut the main stem,but the saw threw the chain because one basr stud nut got lost & the other nut was loose.Now I gotta see if I can find another nut.I hate losing my nuts,Lol.

Also afraid of loosing my nuts, blue locked tightened everything on my way out and placed insulators where specified but like putting a wolverine in a doll house.

 

[nbbt]

Is common sponge the stuff I use at work fine for the spit back collection. Seemed to absorb and evaporate out in test piece. Is there a particular product/name.

If you have any foam air filter material I'd bet that it would likely be more fuel and oil resistant than a piece of common sponge. Just a thought !

 

[edju1958]

I like to use tall nuts (this Amazon lister calls them high nuts) for bar nuts on the large frame saws.

Amazon.com

I'd ask how you can lose an SP125 but I know I misplaced one in my shop recently, I remembered where I put it a week or two later...

Mark

I was a bit frantic when I got robbed back in late May/early June & had picked up the 125 thinking it was another saw & placed it on a plywood covered floor & the put other saws on top of it (probably to conceal it from further theft).

 

[heimannm]

From late in 1974...

 

[the 28inch mac man]

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That's neet. Easy way to date the 50s macs.

 

[edju1958]

Would the bar stud nut from a 1-45 work on the 125?

Never mind,I just looked on the master IPL for the 1-40-1-50 & it's the same nut.

 

[Dream]

So the SP81 and PM55 have been getting some excersize lately.
Took down a 36" willow oak that has stood beside my grandparents house as long as my grandparents could remember.
Today i started storm cleanup at our house.
Been busy with others that had it worse and just getting to ours.
SP81 just makes me smile. Its the perfect size for taking down those larger trees.
PM55 is a snappy little rascal. Makes quick work of limbs and anything up to around 18".

Guy with the SP81 is my dad. Will be 78 on 10-26 and still going strong.
No i didnt let him run it. I was greedy...

 

[Sloa]

If you have any foam air filter material I'd bet that it would likely be more fuel and oil resistant than a piece of common sponge. Just a thought !

Thanks, yes I do. Googled gas absorbing/resisting sponge and nothing fit my need and what I’m thinking I need is right in front of me. Literally!

 

[heimannm]

7-55 in the process of going back together.

Rotary valve is mounted to the crankshaft...



...the port into the crankcase is opened as the crankshaft rotates...



...the rotary valve is keyed to the crankshaft and a spring washer under it keeps it sealed to the crankcase.

Mark

 

[heimannm]

There are loose needle bearing on the crankshaft and a three piece cage for the bearings.



If you do things correctly, you can stick the rod cap to the crankshaft as well.



Be sure to keep the pips on the rod cap and connecting rod in the proper orientation.



The points are externally mounted and operated by a pushrod that rides on an eccentric on the crankshaft.



Mark

 

[heimannm]

The early two man saws (5-49, 12-25, 7-55, and the 99) were all equipped with rotating counterweights to help reduce vibrations.



Counterweight cover and cylinder installed, muffler and carburetor in place with solid rubber "gaskets" to allow pressure testing.



I had to take it mostly apart again in order to apply some Dirko HT to the counterweight cover gasket and cylinder gasket to stop them from leaking.

I also pulled the primer apart to check it over, replaced an o-ring and pressed it back together.



In order to get it the gland pressed to correct depth I put a mark on this piece of tubing. I'll keep it with the two man diaphragms & carburetor parts for the next one.



Mark

 

[dhoey1212]

Got a McCulloch Eager Beaver 428 42cc 18” bar off marketplace. Started and ran for a while, then started bogging down and only running on choke. Sat for a while and then didn’t run at all. When I decided to deal with it this weekend I found one of the gas lines disintegrated in the tank. Replaced gas line, fuel filter, and disassembled and cleaned carb. I put everything back together today and haven’t had any luck getting it to start again. Compression good, plug has spark, when I pull off fuel lines they are full. Any ideas on how to get this thing to fire up?

 

[hacskaroly]

disassembled and cleaned carb.

Welcome to the forum!! Hopefully someone more knowledgeable will answer, but in regards to your carb, what condition was the diaphragm's in? Soft or stiff? Do you have a way to test to see if you might have an airleak in the carb?

I have a Husky 562 with a problem carb that is eluding me. I can get it to prime fuel into the carb, but not into the purge bulb. I know I have an air-leak, but cannot find where. I have had other carbs that leaked around the seams. Adding pressure and spraying soapy water (or dunking it in a tub of water) has showed me where leaks are usually. Typically a new diaphragm kit solves that issue.

 

[NZsaws]

Hello all,
Picked up 3 old macs this week, 250 super,
7-10 and a PM80 for about US$50 all looking a bit sad. The SP80 had a broken rope so threw the 7-10 recoil on it and 5 pulls and it ran!
Further inspection, apart from paint all but gone it has no missing parts and structurally very sound.
When running seems to race slightly when idling so maybe air leak somewhere?
Always wanted to rebuild a 80cc 10-series, is there anything I should look out for? After 50 years would the crank seals need replacing?
Also find it vibrates more than my PM700 anyone have suggestion on what may be causing this?
Cheers!