Valve Clearance Adjustment - Isuzu A-4JA1 Workshop Manual

3 1 2

VALVE CLEARANCE ADJUSTMENT

1. Retighten the rocker arm shaft bracket bolts in
Rocker Arm Shaft Bracket Bolt
Torque
4
2. Bring the piston in either the No. 1 cylinder or the
TDC
3. Check for play in the No. 1 intake and exhaust valve
Adjust the No. 1 or the No. 4 cylinder valve clearances
while their respective cylinders are at TDC on the com-
pression stroke.
Valve Clearance
Loosen each valve clearance adjusting screw as shown
in the illustration. (At TDC on the compression stroke of
the No. 1 cylinder)
Insert a feeler gauge of the appropriate thickness
between the rocker arm and the valve stem end.
4. Turn the valve clearance adjusting screw until a
5. Tighten the lock nut securely.
sequence as shown in the illustration.
5.0 – 6.0 (36.2 – 43.4/49.0 – 58.8)
No. 4 cylinder to TDC on the compression stroke by
turning the crankshaft until the crankshaft damper
pulley TDC line is aligned with the timing pointer.
push rods.
If the No. 1 cylinder intake and exhaust valve push
rods have play, the No. 1 piston is at TDC on the
compression stroke.
If the No. 1 cylinder intake and exhaust valve push
rods are depressed, the No. 4 piston is at TDC on the
compression stroke.
0.40 (0.016)
slight drag can be felt on the feeler gauge.
MAINTENANCE
kgf·m(lb.ft/N·m)
mm(in.)
23