waterpump pulley problem

[redkneckracer]

having problems gettin the sheave on my 420's waterpump pulley to come apart so take my main belt off. i loosend the jam nut and i can turn the screw all the way out and the sheave still won't open? any ideas anyone? thanks

[JimAnderson]

Hello,
The water pump pulley is two piece.One part is threaded onto the other.
Just behind the fan you will see four raised lugs which can be tapped on
with a drift to unscrew the front from the rear.
If you are going to do your own work on the machine the service and
parts manuals are priceless,easy to get and pay for themselves in
broken parts alone.Luck,JimAnderson

[redkneckracer]

yeah ive owned a bunch of continental 4 bangers that had two piece sheave like this but were spring loaded not screw type like this. i have the official 420 shop manual for my machine but it don't show a good description of the procedure. im a bit eliterit aswell haha