OS21 xm outboard help.

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Steven Bryant

Well-Known Member
Supporting Member
Joined
Jun 22, 2012
Messages
638
Hey guys I need to replace my crank shaft bearings and I can't get undo the nut that hold the fly wheel on, can someone tell me what direction I need to turn the nut to undo it please.

Cheers
 
Thanks Jerry, I'll give it a go later on. I'm going to be installing the version two air cooled head, piston/liner and rod, is there anything I need to know before fitting and once fitted what head clearance do I need to run on 30% nitro?

Cheers
 
I certainly will Brad, unfortunately I'm having huge problems getting the nut off the crank shaft, I've tried everything and the dam thing will not budge. Any ideas?
 
I like to leave the crank in the case and insert a hard piece of plastic (ground down toothbrush works well) into the crank window (remove carby) then undo the nut (righty loosy, lefty tighty
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I have been known to use a rubber covered handle from pliers when desperate
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I have also been the victim of tightening the crap out of the OS nut and thinking I was in the **** and not getting it off EVER, then finding out it is left hand haha
 
Using Kris's method of holding the crank and Jerry heat suggestion - As well as some PB BLASTER - may require two people or a careful use of a vise to secure the motor

LIGHTLY tap the end of the tool your using while attempting to loosen the nut with turning RIGHT ,With pressure applied- normally the heat / Blaster and light tap will break it loose.

A Brass hammer or dead blow hammer and drift is your friend.

Good Luck.

Andy
 
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Better yet, take two pieces of pine 2x4, drill a hole in each for a machine screw, install a screw that matches the hole size of the 2 holes in the outer circumference of the flywheel, cut off the heads of the screws leaving enough protruding to engage the flywheel holes, clamp the flywheel between the 2 blocks with the protruding screws in the flywheel holes & remove the nut. No fuss, no marks on the flywheel, no risk of internal damage, simple & cheap (-; Another benefit is that the flywheel is held both tight & steady enough to use a torque wrench to install it correctly.
 
Torque wrench,What's a torque wrench.LOL

I tighten the nut untill it strips then back it off a quarter of a turn.
 
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OK then, what's a "quart" of a turn Dave? LOL! My torque wrenches read in inch lbs or foot lbs, not quarts.......
 
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Well finally after an extremely long week at work I've managed to get back to the engine, following your advise guys I managed to remove the flywheel nut and flywheel, thanks for all your helps guys.
 
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