Cummins N14 STC, Celect, Celect Plus – Service Manual 006-026   Injector

When installing injectors for reuse, new o-rings must be installed on the injector.

NOTE: The CELECT™ Plus injectors require three different injector o-rings. The traditional black, brown, and black with white dot colors have been changed to red, white, and blue respectively. The coloring is a Teflon® casting; the o-ring material has not been changed. There is no change in part numbers for these o-rings. The old colors will be present until existing stock is depleted. It is okay to mix the black and the red o-ring, the brown and the white o-ring, or the black with the white dot and blue o-ring.

• Top – red
• Middle – white
• Bottom – blue.

Lubricate the o-rings with lubricating oil just before installation.

CAUTION  To reduce the possibility of injector damage, do not strike the top stop spring cage when installing CELECT™ Plus injectors.

Use the CELECT™ Plus injector puller/installer, Part Number 3823579, to install the injector into the cylinder head injector bore with the injector solenoid valve facing the intake side of the engine.

CAUTION  Do not strike or pry on the solenoid. Otherwise, injector damage will occur.

After partial installation of the injector, take precautions to center the solenoid valve between the valve springs. Avoid contact with the spring coils. If the injector is contacting a valve spring, use a screwdriver to position the injector again.

Continue driving the injector into the bore, use the injector puller/installer, Part Number 3823579.

If an injector puller/installer, Part Number 3823579, is not available, a screwdriver can be used to install the injector by putting the screwdriver on the injector body at the base of the injector solenoid and striking the screwdriver with a soft mallet. Do not strike on the injector solenoid or on the top stop spring cage.

CAUTION  The injector must be fully seated before installing the hold-down clamp. The hold-down clamp can not pull the injector into the bore. Engine damage can occur if the injector is not fully seated.

Install the hold-down clamp capscrew.

Take care to route the injector solenoid leads to avoid contact with the valve and injector push tubes.

Connect the injector solenoid leads to the pass-through connector in the rocker housing. Push the lead into the connector until a “snap” is heard.

Check the wire connector to make sure the connector is properly locked in position.

If the wire connector will not lock into position properly, refer to the CELECT™ Plus Fuel System Troubleshooting and Repair Manual, Bulletin 3666130.

Install the crossheads into their original location to prevent excessive wear.

Install a set of new injectors, use the 8-qt 10-hole cup configuration that was removed from the engine. This will make sure the injectors will not have any unseen cavitation damage internal to the injector cup at the time of kit installation.

Install three new o-rings over the injector and into the retaining grooves. Do not twist the o-rings.

Lubricate the o-rings with clean engine oil just before installation.

Check the bores in the cylinder head for burrs or sharp edges that can damage the o-rings. Repair damaged injector bores.

Install new o-rings on the step timing control oil manifold connections.

Align the injector with the oil manifold connections and install the injector into the cylinder head injector bore.

CAUTION  Make sure to place the instrument used to install the injectors on the top cap of the injector, not on the plunger or link. The plungers will be damaged.

Install a 27 mm [1-1/16 in] deep well socket over the top link of the injector. The socket must rest completely on the top surface of the injector top cap to avoid bending the inner part of the top cap.

Use a clean, blunt instrument to seat the injector in the bore.

A snap will be heard and felt as the injector is seated.

If the injector does not seat, remove it and check the o-rings for damage. Replace any damaged o-rings.

CAUTION  The injector must be fully seated before installing the hold-down clamp. The hold-down clamp can not pull the injector into the bore. Engine damage can occur if the injector is not fully seated.

Install the injector hold-down clamp and capscrew.

Install the crossheads on the valves.

NOTE: The crossheads must be installed in the same positions from which they were removed.

Rotate the rocker levers down, and install the push rods and push tubes.

NOTE: It is necessary to bar the engine over and install the push rods and push tubes as camshaft position allows.

Make sure the push rods are properly seated in the cam follower sockets.

Turn the adjusting screw for each rocker lever in until it is properly seated in the push rod socket.