Dismantling a McCulloch 335

Jeff Smith

Hi,

I'm just a ordinary DIY guy with only the occasional tree to saw up so that I can split the logs for wood-burning.

As the cheapest budget chainsaw on the market I bought a McCulloch 335 petrol 14" saw. I haven't treated it very well - I own up. I used some old diesel contaminated petrol for some time - hell, I wasn't about to throw away 10 gallons of the stuff - so I've used it in lawnmowers and the like. After running with a lot of smoke and getting very hot at times it started misfiring and eventually lost all power.

I took it to my local chainsaw repair shop and they advised that the crank seals had gone and it wasn't worth paying to have it repaired.

So - nothing to lose - I have started to dismantle it to get at the seals.

I've managed to get the starter ring/airvane thingy off on one side - but on the other side is the clutch mechaism with the drive sprocket. I can see the end of the crankshaft but have no idea how the clutch mechanism is taken off. Is it a screw on fitting with wrong handed thread or what?

Is there a manual for repair of the chainsaw that I could download anywhere?

Any help would be appreciated.

Thanks.

Jeff Smith. Cheshire UK.

Not many redwoods around here.

newguy18

The clutch is left handed thread,so take a pin punch and a hammer and carefully smack it until the clutch spins on its own and then you should be able to unscrew it with your fingers easily.If yuor not careful you will crack the clutch shoes and have to rebuild the clutch.

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Jeff Smith

Thanks for reply.

I was beginning to think that must be the method of fixing - so that the clutch didn't come off in use. The is no other visible means of fixing.

I have tried a few 'gentle bashes' on the clutch without success at the moment (in the left hand screw direction). The problem is holding the crankshaft still. I have wedged a bar between the blades of the flywheel - but this is an aluminium casting and I am very cautious about doing some damage to it - especially shearing the key.

Is there a better way of stopping the crankshaft from rotating while I am trying to 'encourage' the clutch to spin off?

Thanks for your help.

newguy18

Buy a plastic piston stop,

It looks like this but make sure specify the plasic one as that one can strip the thread in your plug hole.

Attached Thumbnails

 

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