Isuzu Trooper 1999 Workshop Manual page 1548

5. Apply a force of about 113 N (26 lb) to the tip of the
shift fork in the direction of the transmission to engage
the clutch pressure plate and release bearing.
NOTE: A clicking sound is heard when the release
bearing and the tip of the diaphragm spring engage each
other.
Check to see if they are securely engaged by pushing the
tip of the shift fork toward the engine while applying a
force of about 25 N (5.5 lb). If the shift fork will not move,
then they are securely engaged.
MANUAL TRANSMISSION
6. Install three flywheel under cover.
7B–9
225RX001
220RS006