Isuzu — Injection Timing Confirmation - Distributor 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 injector pump distributor head plug.
- Fit a dial gauge and set lift to 1 mm (0.039 in).
- Set crankshaft damper pulley Top Dead Center mark about 45° before TDC from the pointer.
- Set dial gauge in the "0" position.
- Turn the crankshaft a little rightwise and leftwise and see if the pointer is stable in the "0" position.
- Turn the crankshaft in the normal direction and read the measuring device's indication at TDC.
- If outside specified range, loosen the injection pump fixing nuts and bracket bolts and adjust the injection pump setting angle.
Tools required
- Measuring device: 5-8840-0145-0 Amazon
Tool links are Amazon searches (affiliate links); manufacturer special tools may only be available from a dealer.
Specs & values
- Starting Timing: 0.5 mm (0.02)
- Pump Fixing Bolt: 1.9 kgf·m (13.7/18.6)
- Injection Pump Distributor Head Plug: 1.7 kgf·m (12.3/16.7)
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.