High Clutch Piston

WARNING: This page is about a different variant/trim than selected.

Make sure that check balls are not fixed.
Apply compressed air to check ball oil hole opposite the return spring. Make sure there is no air leakage.
Apply compressed air to oil hole on return spring side to make sure that air leaks past ball.

Fig 1: Applying Compressed Air To Oil Hole
Courtesy of NISSAN MOTOR CO., U.S.A.