ISC, ISCe, QSC8.3, ISL, ISLe3, ISLe4 and QSL9 Engines – 005-229   Fuel Injection Pump

Disconnect the injection pump supply line. Refer to Procedure
006-024.

Remove the injector supply lines. Refer to Procedure
006-051.

Disconnect the fuel drain line. Refer to Procedure
006-013.

Disconnect the pumping control valve 4-pin Deutsch connector.

Disconnect the injection control valve 4-pin Deutsch connector.

Disconnect the accumulator pressure sensor.

Disconnect the accumulator temperature sensor.

Remove the injection pump upper support bracket.

Remove the injection pump tail support bracket.

Remove the fuel pump gear access plug.

Locate top dead center for cylinder number 1 by barring the engine slowly until the line on the pump gear lines up with the line on the gear cover.

Remove the fuel pump drive gear retaining nut and washer.

Pull the fuel injection pump drive gear loose from the pump driveshaft.

Remove the four mounting nuts.

Remove the fuel injection pump.

The fuel pump driveshaft key
must not be sheared.

If the key is sheared, the cam housing module of the fuel pump
must be replaced and the drive gear
must be replaced.

Check that the locating dowel is installed in the cam housing.

Be sure the engine is at number 1 cylinder top dead center. The fuel pump gear timing mark should align with the top dead center mark on the gear housing.

Clean the fuel injection pump drive shaft with an evaporative cleaner.

Clean the fuel pump gear inside diameter with an evaporative cleaner.

The fuel pump drive gear inside diameter and the drive shaft outside diameter
must be clean and dry before installing the gear.

Make sure the fuel injection pump is at its top dead center position.

The fuel injection pump is at number 1 cylinder top dead center when the dowel pin in the shaft (A) is perpendicular to the top of the accumulator.

Be sure that the dowel is installed in the pump driveshaft.

Make sure the o-ring seals for the oil feed orifice (A) and pilot (B) are correctly installed and are
not damaged.

Lubricate the mounting flange with cleaner.

The fuel pump drive gear inside diameter and the shaft outside diameter
must be clean and dry before installing the gear.

Slide the fuel injector pump shaft through the drive gear and position the fuel injection pump flange onto the mounting studs.

Make sure the dowel pin in the shaft (A) lines up with the keyway in the fuel injection pump gear.

Make sure the dowel pin in the fuel injection pump flange lines up with the hole in the gear housing.

Install the mounting nuts.

Install the fuel injection pump upper support bracket.

Install the fuel injection pump tail support bracket.

Tighten the fuel injection pump drive gear nut.

Install the gear cover access cap hand tight.

Connect the injection pump supply line. Refer to Procedure
006-024.

Connect the injector supply lines. Refer to Procedure
006-051.

Connect the fuel drain line. Refer to Procedure
006-013.

Connect the pumping control valve 4-pin Deutsch connector.

Connect the injection control valve 4-pin Deutsch connector.

Connect the accumulator pressure sensor to the engine harness.

Connect the accumulator temperature sensor to the engine harness.

Operate the engine and check for leaks.