Isuzu — Injection Timing Confirmation - In-line Type Injection Pump
Adjustments
From a Isuzu service manual — check it applies to your exact model before use.
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Procedure
- Rotate the crankshaft clockwise to align the camshaft gear timing mark "O" with the timing gear case cover pointer.
- Remove the No. 1 fuel injection pipe.
- Remove the delivery valve holder, delivery valve spring, and delivery valve.
- Tighten the delivery valve holder to the specified torque.
- Operate the injection pump priming pump while slowly rotating the crankshaft until fuel stops flowing.
- Confirm that the crankshaft damper pulley notched line is aligned with the timing gear case cover pointer.
- Remove the delivery valve holder, install the delivery valve, spring and holder, and tighten to specified torque.
- Install the fuel injection pipes and tighten to specified torque.
- Bleed air.
Specs & values
- Delivery Valve Holder Torque: 4.0 – 4.5 kgf·m (28.9 – 32.5/39.2 – 44.1)
- Injection Timing (Static BTDC): 14°
- Fuel Injection Pipe Torque: 2.0 – 4.0 kgf·m (14.4 – 28.9/19.6 – 39.2)
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.