Hi
I cant get the cush dive nut off (B31 1955 Plunger) ...its been really butchered by a previous owner but I cant get it to move; There doesn't appear to be a tab washer behind it- between the nut and the spring- I've tried stiltsons and a big hammer but cant shift it.......any tips gratefully received !!
It's not a left hand thread by any chance?
If it is seized you could try heat, if you have good access use a socket rather than stilson's for better grip, heat the assembly using a hot air gun, (the sort electricians use to shrink plastic heat shrink) then shock the socket bar with a hammer. Applying heat to the nut expands it more than the threads it is screwed onto.
These nuts can be done up very tight and have often been done up and undone over the years with drifts and chisels.
The nut is a right hand thread 3/4 inch x 20 tpi cycle.
There is provision for a lock washer between nut and cush drive sleeve. They get left out sometimes. It folds into the back of the nut where the arrow points on photo.
A soft drift and hammer is the tool of necessity if the nut is too damaged to get the tool on it but locking the shaft against rotation can be a problem. If loctite has been used you may need heat to break it. Locking on the clutch sometimes just causes the cush drive to operate - you might stop this using a suitable strip of metal between the spring coils or you might have to lock it through the small end eye.
Thanks guys...I'll have another go in the morning
cheers
I don't think a hot air gun will be up to the task. You may need a propane/butane gas torch and get the nut good and hot. If it's hot enough for oil to sizzle out of the threads a good clout with a hammer and a drift should shift it.
Well that proved to be a real **********.... got it off eventually ...lots of heat and a big hammer !... the nut is completely butchered but at least its off. A lot of the problem was stopping things moving- the rear brake has seized so couldn't use that so ended up cutting a large wedge of wood and wedging this - with a rubber mat, between the rear wheel and the gearbox/frame.
Anyhoo ...thanks for you help guys :)