ISC, ISCe, QSC8.3, ISL, ISLe3, ISLe4 and QSL9 Engines – 005-089   Fuel Pump Gear Pump Module

Measure the outlet pressure at the diagnostic fitting on the CAPS pump at a rated flow condition and compare to the following chart.

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 or dirt can cause personal injury.

CAUTION  Make sure that steam does not spray directly on the electrical connections on the top of the accumulator block, or fault codes will possibly occur.

Thoroughly steam-clean the entire fuel pump.

Dry the fuel pump with compressed air.

Remove the air bleed line. Refer to Procedure 006-056.

Remove the fuel pump from the engine. Refer to Procedure 005-016.

Mount the fuel pump in a vise ring. Orient the pump with the distributor facing upward to aid in disassembly.

Remove the rate shape tube. Refer to Procedure 005-090.

Remove the distributor module. Refer to Procedure 005-086.

Remove the gear pump module.

NOTE: Do not remove the two capscrews. The gear pump will slide off the dowel pins once the distributor is removed.

Clean the mounting surfaces of the gear pump and cam housing.

Use QD contact cleaner, Part Number 3824510.

Inspect the drive coupling and shaft ends for excessive wear.

A polished surface is acceptable.

Replace the coupling if wear is visible.

CAUTION  The larger o-rings on either end of the gear pump differ in size. The longer o-ring goes to the side facing the cam housing.

Install new o-rings.

Apply Lubriplate™ 105, or equivalent, to the o-rings to keep them from falling out during assembly.

Install the drive coupling.

Center the coupling in the shaft.

Align the gear pump shaft with drive the coupling and install the gear pump module.

Make sure the o-rings are not pinched.

Make sure the timing dowel pin is facing toward the top of the fuel pump.

Install the distributor module. Refer to Procedure 005-086.

Install the rate shape tube. Refer to Procedure 005-090.

Install the fuel pump on the engine. Refer to Procedure 005-016.

Install the air bleed line. Refer to Procedure 006-056.

Start the engine and check for fuel leaks or active fault codes.

Road-test the vehicle for at least one mile. Recheck for fuel leaks or active fault codes.