N14 Base Engine Troubleshooting and Repair Manual – 003-009   Rocker Lever Assembly

Remove the rocker lever covers. Refer to Procedure

003-011-002.

Remove the engine brake. Refer to Procedure

020-001-002.

Loosen the valve and injector adjusting screw lock nuts on each rocker lever.

Turn the adjusting screws

counterclockwise
until the rocker levers are loose.

CAUTION  Do not attempt to remove or install the rocker lever shaft assemblies without resetting the lash.

Remove the rocker lever shaft capscrews and the rocker lever shaft assemblies.

NOTE: To prevent increased wear, mark each rocker lever as it is removed so it can be installed back in its original location.

Remove the rocker levers from the shaft.

Remove the lock nuts and the adjusting screws from the rocker lever.

NOTE: To prevent increased wear, mark each adjusting screw as it is removed so it can be installed back in its original rocker lever.

WARNING  When using a steam cleaner, wear protective clothing, and safety glasses or a face shield. Hot steam can cause serious personal injury.

Use steam or solvent to clean the rocker lever shaft. Dry with compressed air.

Be sure to blow out the oil passages.

Visually inspect the shaft for cracks or damages.

Measure the rocker lever shaft’s outside diameter in the bushing wear area.

Replace the rocker lever shafts as necessary.

Use steam or solvent to clean the rocker levers, and dry with compressed air.

NOTE: Make sure to blow out the oil passages.

Visually inspect the rocker levers for cracks or unusual wear and thread condition.

Measure the rocker lever bushing bore inside diameter.

NOTE: Replace the rocker lever bushings which are worn beyond the maximum limit. Refer to the Engine Shop Manual for detailed instructions.

Use steam or solvent to clean the rocker lever adjusting screw and nuts.

Dry with compressed air.

Visually inspect the adjusting screws and the nuts for distorted threads.

Visually inspect the adjusting screw. The contact area

must
be smooth with an even seating pattern.

If parallel scratches are found in the contact area, the adjusting screw

must
be replaced. This condition is normally found with worn push rods that will also require replacement.

Install the adjusting screw and the lock nut in each rocker lever. Do

not
tighten the lock nuts.

Install the exhaust (1), injector (2), and intake (3) rocker levers onto the shaft.

The two levers closest to the center of the rocker housing are the intake valve rocker levers. The levers closest to the end of the rocker housing are the exhaust valve rocker levers.

CAUTION  If the adjusting screws protrude beyond the maximum listed below, the push rods can be damaged when the rocker shaft capscrews are tightened. Do not attempt to install the rocker lever shaft assemblies again without resetting the lash.

Loosen the rocker lever adjusting screws so there is a maximum of 32 mm [1.250 inch] from the top surface of the lever and the ball end of the adjusting screw.

Place the rocker lever assembly over the dowel pin and dowel ring located in the rocker housing.

NOTE: Do

not
damage the dowel pin and ring located in the rocker housing.

Make sure the push rods are in the cam follower sockets and align the push rods with the injector and valve rocker lever adjusting screws.

Alternately tighten the rocker shaft capscrews:

• Tighten to 54 N•m [40 ft-lb]
• Tighten to 108 N•m [80 ft-lb]
• Tighten to 156 N•m [115 ft-lb]

Adjust the valves and injectors. Refer to Procedure

003-004-029.

Install and adjust the engine brakes. Refer to Procedures

020-001-026 and

020-001-029, respectively.

Install the rocker lever covers. Refer to Procedure

003-011-026.