clutch not clearing-could be operating arm broken, clutch ratchet slipping, clutch quadrant broken [adjustable type], release fork notpushing bearing square to cover. [fork fractured,roll pins broken],could also be clutch plate spring broken and stuck between cover/plate/flywheel. reason for grating in rev is its not syncrho whereas forward gears are thats why they wont engage!
k, March 2009