ISC, ISCe, QSC8.3, ISL, ISLe3, ISLe4 and QSL9 Engines – 005-020   Fuel Pump Delivery Valve

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.

Thoroughly steam-clean the distributor outlet fitting and fuel pump area.

Dry with compressed air.

Remove the high-pressure fuel supply lines. Refer to Procedure 006-051.

Remove the distributor outlet fitting and the seal disk.

NOTE: A tool like the one shown here can be made from a 1/8 in or 3/16 in allen wrench. Use it to remove the seal disc. Refer to Procedure 005-084 for instruction on how to make the tool.

NOTE: The outlet fitting valve and seat are a matched set; do not “mix and match” valves and seats with other outlet fitting assemblies.

If either the outlet fitting valve or seat is damaged, the entire outlet fitting assembly must be replaced. Also, the seal washers must always be replaced.

Check for broken parts, debris, or sticking of the outlet fitting valve. Replace the outlet fitting assembly if any parts are damaged. Always replace the seal washer.

Use QD contact cleaner, Part Number 3824510, to clean the delivery valve port in the distributor.

Install a new seal washer into the distributor outlet fitting hole. Make sure the washer is fully seated in the bottom of the hole.

Install the outlet fitting assembly hand tight.

Tighten the outlet fitting assemblies.

Install the high-pressure fuel supply lines. Refer to Procedure 006-051.

Operate the engine and inspect for fuel leaks.