Isuzu — Valve Clearance Adjustment
Adjustments · Valve train
From a Isuzu service manual — check it applies to your exact model before use.
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Procedure
- Retighten the rocker arm shaft bracket bolts in sequence shown in the illustration.
- Bring the piston in No. 1 or No. 4 cylinder to TDC on the compression stroke.
- Check for play in the No. 1 intake and exhaust valve push rods.
- Insert a feeler gauge of the appropriate thickness between the rocker arm and the valve stem end.
- Turn the valve clearance adjusting screw until a slight drag can be felt on the feeler gauge.
- Tighten the lock nut securely.
- Rotate the crankshaft 360° and realign the TDC line with the timing pointer.
- Adjust the clearances for the remaining valves.
Tools required
- Feeler gauge Amazon
Tool links are Amazon searches (affiliate links); manufacturer special tools may only be available from a dealer.
Specs & values
- Valve Clearance: 0.40 mm (0.016)
- Rocker Arm Shaft Bracket Bolt Torque: 5.0 – 6.0 kgf·m (36.2 – 43.4/49.0 – 58.8)
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.