McCulloch Chain Saws

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I only go to the extra effort of blocking off the impulse oiler if I have a leak that I cannot otherwise identify.

Usually I will check the seals and the crankcase for pressure leaks (bubbles) and if that is good I don't worry too much about the little bit of leakage through the pulse passage.

Mark
 
I have a Pro-mac 55 I bought new in about 1975, I haven't started it in many years...

SR
Thats pretty cool. I have several mcculloch saws made in the 60s 70s or 80s but only really a couple i could pinpoint to a year. Thats not even a guarantee. Only 1 i can guarantee when it was bought originally. My cp125 came with the guys original receipt which is a really neat item. Not being mean but i too was made in 1975. Haha
 
Looks like you’re getting it figured out! Every saw has its unique challenges when it comes to vacuum pressure tests. I’ve never tested any of my Macs though. When I have tested other saws though, I have always just cut rubber gaskets like your using and then bolted the carburetor and mufflers back on good and tight over the gaskets and hooked my Mityvac into the spark plug hole. Spray soapy water around if you’re losing pressure to find the leak.
 
Thats pretty cool. I have several mcculloch saws made in the 60s 70s or 80s but only really a couple i could pinpoint to a year. Thats not even a guarantee. Only 1 i can guarantee when it was bought originally. My cp125 came with the guys original receipt which is a really neat item. Not being mean but i too was made in 1975. Haha
Depends on your birth date, you may have been made in "74". LOL

SR
 
Looks like you’re getting it figured out! Every saw has its unique challenges when it comes to vacuum pressure tests. I’ve never tested any of my Macs though. When I have tested other saws though, I have always just cut rubber gaskets like your using and then bolted the carburetor and mufflers back on good and tight over the gaskets and hooked my Mityvac into the spark plug hole. Spray soapy water around if you’re losing pressure to find the leak.
Going to get it soon enough! Was thinking about testing from the spark plug hole with the piston at BDC, but my vacuum/pressure tester kit from Amazon didn’t have anything I could make work. I think I’ve read somewhere about making a fitting out of an old spark plug.
 

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