Rocker59
ArboristSite Member
Maybe wrong length spark plug or something like a bolt (or broken points) behind the flywheel?
McCulloch Chain Saws
- Thread starter Bruce Hopf
- Start date
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I took the plug out, but I need a puller to remove the flywheel, it would be great if you were right!
Interested in flywheel puller suggestions for an 80cc Mac??
Something off Amazon or EBay?
I tried the hammer technique...nothin doin.
Something off Amazon or EBay?
I tried the hammer technique...nothin doin.
Rocker59
ArboristSite Member
I’ve used my harmonic balance puller for alot of saws. The Husky puller works well also.
Shown here pulling the crankcase cover but the same arrangement would work on the flywheel with smaller O.D. washers.
I like to leave the nut on, loosened a couple of turns. Those flywheels often come off when you least expect it, and with considerable velocity.
Mark
I like to leave the nut on, loosened a couple of turns. Those flywheels often come off when you least expect it, and with considerable velocity.
Mark
So I should just that style puller instead of buying a dedicated chainsaw engine flywheel puller, thanks Mark you saved me some money, I already have that style puller, just need some long 1/4-20 bolts.
Another tip, get the puller snug NOT TIGHT and give it a good rap or two with a metal hammer. Tighten it a bit more, another whack, etc. If it doesn't move easily I've had better luck with mild tension and shock than with a lot of tension and shock.
Support the saw by the puller when you give it a rap, that will allow the puller and flywheel to remain in place while you drive the crankshaft away from your blow.
Mark
Mark
Thanks a lot guys, I'm going to give 'er heck later tonight and see what happens. (The saw that is).
Well i got the 795 today. Im happy to say im excited. Very clean, complete machine. No damage. The cylinder is in great shape, the piston looks fantastic. The carburetor has been swapped out with a tillotson hl119 already. Its not a mac carb. I did see a few fasteners missing. The muffler has very little surface rust. Inside the fuel tank is very clean. Other than some little things....i believe it to be a rather low hour saw. Perhaps this weekend ill have it running.
Im at softball practice or id send photos...sorry.
Im at softball practice or id send photos...sorry.
Success!!! Flywheel is off....now for the big reveal.
Big ol mess....
Question, what comes off next? Fuel tank?
Question, what comes off next? Fuel tank?
What's the end goal? If getting to the guts is your objective pull the clutch side completely apart. Next remove the 6 circular screws around the crank and pull the "case half" off. Fuel tank is next, pop the cover off, then the back half and you will see the cap screws. Pop 'em off, catch the 5 million needle bearings that fall out, tap the crank out the fw side, and pull the rod out or ram a dowel through the plug hole and drive it out.
Yes sir that's my objective!!
A million needle bearings eh... that sounds fun. Haha
Thank you!
The bar studs....and the oil pump / passages... are in the fuel tank? Man oh man....
So at this point....how many of those bolts need to come out to separate the tank from the engine? Can the oil tank stay attached to the fuel tank or does everything have to come apart?
So at this point....how many of those bolts need to come out to separate the tank from the engine? Can the oil tank stay attached to the fuel tank or does everything have to come apart?
Undo the 4 large bolts, they have rubber washers/orings to seal the tank. I don't recall perfectly but I don't thing anything on top around the oil tank is holding that assembly to the case. So, the oil tank can stay attached.
The 450 looks pretty old, probably similar vintage to my 795?? I've never had it apart (runs good) , but if I need to would it be similar procedure as outlined in this thread? Perhaps there is another thread somewhere on take apart the 795? I appreciate your input Mark, thanks
My 450 is dated about 1964 - 1966 according to the Mike Acres site, it is indeed an old beast!
I hope everyone doesn't mind me sharing all these photos of my rebuild, hopefully it can help someone out in a similar project.
I hope everyone doesn't mind me sharing all these photos of my rebuild, hopefully it can help someone out in a similar project.
The 450 looks pretty old, probably similar vintage to my 795?? I've never had it apart (runs good) , but if I need to would it be similar procedure as outlined in this thread? Perhaps there is another thread somewhere on take apart the 795? I appreciate your input Mark, thanks
Look for 797 build threads. Built the exact same way. That said, the 795 comes apart much the same as that 450. Difference being the 795 has a top fuel tank and front oil tank. The 450 is the other way around. The bare motor would come apart identically with the exception of the the decomp. Parts are very swappable with these Super series Macs.
Thank you sir
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