Cummins N14 STC, Celect, Celect Plus – Service Manual 003-009   Rocker Lever Assembly

Remove the rocker lever covers.

Refer to Procedure 003-011 in Section 3.

Remove the engine brake. Refer to Procedure 020-024 in Section 20.

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  Wear appropriate eye and face protection when using compressed air. Flying debris and dirt can cause personal injury.

WARNING  When using solvents, acids, or alkaline materials for cleaning, follow the manufacturer’s recommendations for use. Wear goggles and protective clothing to reduce the possibility of personal injury.

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.

Make sure to blow out the oil passages.

Inspect the shaft for cracks or other damage.

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

Rocker Lever Shaft Outside Diameter

Replace the rocker lever shafts as necessary.

WARNING  When using solvents, acids, or alkaline materials for cleaning, follow the manufacturer’s recommendations for use. Wear goggles and protective clothing to reduce the possibility of personal injury.

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

WARNING  Wear appropriate eye and face protection when using compressed air. Flying debris and dirt can cause personal injury.

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

NOTE: Make sure to blow out the oil passages.

Inspect the rocker levers for cracks or excessive wear and thread condition.

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

Dry with compressed air.

Inspect the adjusting screws and the nuts for distorted threads.

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 without resetting the lash.

Loosen the rocker lever adjusting screws so there is a maximum of 32 mm [1.250 in] 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:

Adjust the valves and injectors. Refer to Procedure 003-004 in Section 3.

• Install and adjust the engine brake. Refer to Procedure 020-024 in Section 20.
• Install the rocker lever covers. Refer to Procedure 003-011 in Section 3.