47 UL engine sprocket shaft nut removal

[Martin Pettingell]

Hi,

I am in the proces of removing the transmission from my 47 UL for a thorough overhaul. At present i have been unable to remove the engine sprocket shaft nut.

The manual suggest a special tool that i dont have and Palmer's book suggests locking the chain / sprocket with a piece of wood to prevent movement while trying to release the nut.

This hasnt worked - i cant seem to lock it down enough to avoid some movement and the nut wont budge.

Is there a simple trick here to get the nut off or do i need to source the proper tool ? If i need the proper tool any idea who might carry them - i'm in the UK

Thanks

Martin

[pete reeves]

Martin.
I would use an air impact wrench (Anti clockwise) the nut should fly off.

Pete Reeves 860 also from the uk

[Rub]

If you don't have an impact use a breaker bar and the correct socket size. Put the breaker bar on and hold it against the engines compression. Give the handle a good whack with a mallet of any sort, preferably a dead blow type, repeat if necessary.
The nut will come off. I've never had one not come off in 40 years!
Robbie

[pete reeves]

If I’m honest that’s the way I would do it if I did not have an impact wrench readily at hand. I was worried that suggesting using a bar and mallet would invite criticism.
Pete Reeves 860

[Chuck#1848]

That is the way I do it breaker bar,correct socket and dead blow hammer work's every time

[Martin Pettingell]

Thanks for the help guys - i dont have access to an air impact wrench but have the break bar and mallet - i'll give it a go.

Martin

[harleytoprock]

If someone has used red loctite when the nut was tighten , the nut will have to be heated to 500 degrees before the loctite lets go. Something wedged between chain and sprocket should pevent the crank from turning. In my youth I have used rags. There is a cheap delrin stepped block tool that works good. The wedge should be placed top,against sprocket and chain, so that the couterclockwise movement makes it wedge tighter. Good Luck?

[Martin Pettingell]

Grateful for the feed back. The job is done now.

After chewing my way through a few bits of wood i used an old 45 sprocket set between the chain and clutch sprocket to lock the crank down a bit more and it did the trick in combination with the socket and brake bar. Just another tip i guess.

Thanks again everybody.

Martin