Centinel System – Repair Manual – 020-019   Engine Brake Piston

Remove the rocker lever cover. Refer to Procedure 003-011.

Rotate the engine to the appropriate valve set mark.

Loosen the locknut and back off exhaust valve lash adjusting screw. Refer to Procedure 003-004.

Remove exhaust valve crosshead and crosshead guide pin.

Remove the engine brake valve lash adjusting screw locknut.

Turn the piston adjusting screw clockwise until piston comes out of the Jake Brake® lever, catch it with your hand.

NOTE: If the actuator piston is seized or stuck in the lever, replace the Jake Brake® lever.

Inspect the actuator piston face and the lever piston bore for wear. Replace the Jake Brake® Lever, if excessive wear is found on either the actuator piston or the lever piston bore. Refer to Procedure 003-009
for rocker lever inspection.

NOTE: Normal wear creates a uniform pattern around the piston face. A piston exhibiting normal wear can be used again, if proper running clearance can be obtained.

Place the piston into the rocker arm.

Holding the piston in place, turn the adjusting screw counterclockwise until the piston is seated. Install the locknut.

Install the exhaust valve crosshead and crosshead guide pin.

Adjust the appropriate exhaust valve and engine brake lever. Refer to Procedure 003-004.

Install the rocker lever cover. Refer to Procedure 003-011.