Isuzu 4LE2 — Injection Timing
Adjustments · Injection pump / shim
For the Isuzu 4LE2, from the Isuzu service manual.
Applies to: Isuzu 4LE2, Isuzu 4LE2 engine
Before you start
- Take care to avoid entry of dust or foreign particles into the pump interior when the timing adjustment is made.
Procedure
- Remove injection pipe of No. 1 cylinder.
- Remove delivery valve holder of No. 1 cylinder injection pump and pull out delivery spring.
- With spring removed, install the delivery valve holder.
- Slowly turn crankshaft pulley clockwise while feeding fuel; stop when fuel stops flowing from No. 1 delivery valve holder.
- Confirm degree of crank pulley groove mark against timing mark on timing gear case.
- Adjust injection timing with a shim between injection pump and cylinder block if out of range.
Specs & values
- Injection timing: BTDC 14°
- Reference: 0.1 mm shim thickness corresponds to 1 degree of crankshaft angle advance
Full service-parts list: Isuzu 4LE2 →, Isuzu 4LE2 engine →
Source: Isuzu service manual. Steps and values are as documented; always cross-check against the official manual and any later revisions for your exact serial number before servicing.