A65 Gearbox sprocket nut

[watts]

I am having trouble tightening the nut because I cannot hold the sprocket tight.
Am I missing something obvious or is there a simple solution.

The engine is on the bench.

Thank you.

[JJC]

Not really!  The best way to get it tightened to the right torque is to do it in-situ with chain on and back brake applied, which of course means a partially disassembled engine in-situ..... and probably isn't a very helpful suggestion... The other option is to make some kind of holding system involving a length of chain that fits around the sprocket and is attached to some sort of lever to hold things while tightening. 

[cdsdorset]

Jam a rag between the sprocket ans casing or the chain.

[DAVE BRADY]

Hi,

As you have the engine on the bench, put the chain on the sprocket and put a screw driver though both runs of the chain just behind cases. Put a piece of wood in to protect the case.
As you turn the sprocket it will pull the screwdriver hard against the case and the sprocket can be tightened.

Dave.

[limeyrob]

Yes, that's how I do it too.

[watts]

Thank you for you suggestions.