Last week I decided to (finally) balance the Raptor's engine.
The first step was to remove the engine and remove the clutch shoe and cooling fan. The plan was:-
a) balance the fan hub
b) measure the engine runout
First, using the Dubro Tru-Spin balancer I placed a spirit level to ensure we have a level base to place the cooling fan:-
Next we place the cooling fan and identify the high-point:-
This cooling fan was way out of balance, so I removed a little material from the cooling fan such that you can rotate it and there is no obvious high point:-