Originally Posted by Soxx
The front of the cranks do wear where the seal runs, however sleeves can be fitted which last a while.
The head does not need to be removed to R&R the timing cover.
Since when did the front seal run on the crank shaft????. It runs on the balancer snout.
They can flog the key way out if the balancer hasnt been tight, this allowes the bottom gear to mover around and cause cam timing to change.
The gear its self can wear the crank out if they key way starts to chew out causeing the gear to lean over slighlty...
Only ever seen it on 250's which some didnt ever run a bolt to hold the balancer on with.