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Home›Repair guides›Fuel Injection Timing Adjustment

Isuzu — Fuel Injection Timing Adjustment

A Isuzu service procedure — check it applies to your exact model before use.

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Before you start

  • Take care to avoid entry of dust or foreign particles into the pump interior when the timing adjustment is made.
  • For each of the injection pumps of three cylinders, the shim adjustment is made at the same time.

Procedure

  1. Remove the injection pipe of the No. 1 cylinder.
  2. Remove the delivery valve holder of the injection pump of the No. 1 cylinder, and then pull out the delivery spring.
  3. With the spring left removed, install the delivery valve holder.
  4. Slowly turn the crankshaft pulley clockwise, at the same time, continue to feed the fuel. When the fuel stops flowing out from the No. 1 delivery valve holder, stop turning the crankshaft. This crank angle position is the starting point of injection.
  5. In the condition at Step (4) above, confirm what degree the groove mark of the crank pulley is at, when seen by the timing mark provided in the timing gear case. When the value is out of the range of the normal injection timing, adjust it accordingly.
  6. Adjust the injection timing with a shim between the injection pump and the cylinder block. Shim is available in 9 types with identification marks stamped on the top face.

Tools required

  • Feeler gauge
  • Shim adjustment tool

Specs & torque values

  • Injection timing: BTDC 14 degrees
  • Shim thickness range: 0.2 to 1.2 mm

Source: manual:Isuzu-4LE2-Workshop.pdf. Figures and steps are as documented; always cross-check against the official manual and any later revisions for your exact serial number before servicing.