Adjusting The Valve Clearance - Isuzu 4LE2 Owner's Manual

Perform periodic inspections and cleanings in accordance with the periodic inspection
and maintenance list. Also, perform an inspection and maintenance when the sound
of rocker arm is loud or when the engine is not working well without a failure in the
fuel system.
CAUTION
• Adjustment of the valve clearance should be performed when the engine is
cold.
IDE-6450A_4500781_ALL.indd 5-29 IDE-6450A_4500781_ALL.indd 5-29
INSPECTION AND MAINTENANCE

Adjusting the Valve Clearance

Periodic Inspection and Maintenance
1. Move the piston of the No. 1 cylinder or No.
4 cylinder to top dead center by rotating the
crankshaft in the forward direction until the
timing mark on the crank pulley aligns with
the TDC mark of the timing gear case cover.
• Before adjusting the valve clearance,
confirm that the rocker arm shaft is not
loosened, and tighten it as necessary.
2. Remove the cylinder head cover to check
which piston is at top dead center. When
free play is present on the rocker arms of the
No.1 cylinder's intake and exhaust valves, it
indicates that the piston of the No.1 cylinder
is at top dead center.
When free play is not present on the rocker
arms of the No.1 cylinder, it indicates that
the piston of the No.4 cylinder is at top dead
center.
3. Adjust the valve clearance with the piston of
the No. 1 cylinder or No. 4 cylinder set at the
relevant top dead center.
The " " mark in the table indicates the
cylinder and valve to be adjusted when the
piston of the No. 1 cylinder or the No. 4
cylinder is at the relevant top dead center.
List → Refer to Page 5-36
CAUTION
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2014/04/18 14:20:06 2014/04/18 14:20:06