ISC, ISCe, QSC8.3, ISL, ISLe3, ISLe4 and QSL9 Engines – 005-037   Fuel Pump Timing

WARNING  Batteries can emit explosive gases. To reduce the possibility of personal injury, always ventilate the compartment before servicing the batteries. To reduce the possibility of arcing, remove the negative (-) battery cable first and attach the negative (-) battery cable last.

• Disconnect the batteries. Refer to Procedure 013-009 in Section 13.
• Remove the gear cover. Refer to Procedure 001-031 in Section 1.
• Remove the fuel pump camshaft nut. Refer to Procedure 005-016 in Section 5.

Check that the fuel pump camshaft alignment dowel is present in the fuel pump drive gear keyway. If the alignment dowel is not visible, remove the injection pump, determine the cause of misalignment, and repair or replace any damaged components.

1. Fuel pump gear keyway
2. Fuel pump timing dowel pin
3. Fuel pump camshaft
4. Fuel pump gear

If this inspection is being performed due to a performance complaint, and the problem first occurred after gear train removal and replacement, then check the timing of the camshaft gear to the crankshaft gear and the camshaft gear to the fuel pump drive gear.

If this inspection is being performed due to a performance complaint, and the problem first occurred after gear train removal and replacement, then check the timing of the camshaft gear to the crankshaft gear and the camshaft gear to the fuel pump drive gear. Refer to Procedure 001-012 in Section 1.

If the engine camshaft gear is mistimed in relation to the crankshaft gear, intake and exhaust valve events will not be optimized. Also, for CAPS injection pump fuel systems, the primary speed sensor reads the tonewheel on the camshaft gear and fuel injection timing will be incorrect.

Install and tighten the injection pump camshaft nut. Refer to Procedure 005-016 in Section 5. Refer to Procedure 005-229 in Section 5.

Install the front gear cover. Refer to Procedure 001-031 in Section 1.