harmonic balancer and sleeve

[old ford guy]

when i took the harmonic balancer off my truck there was a key in the groove--- i also noticed that the spacer was grooved and the crank was grooved all the way back should there have been a key in the sleeve also or should the key have been longer to fit both or is no key necessary with the sleeve

[fordman]

there should be a key in that grove. it fits for both the sleeve and the balancer.

[70_F100]

There is no key necessary for the spacer.

There should be a key for the timing gear and one for the harmonic balancer.