56
PERIODIC INSPECTION
20) Engine Valve Clearance Inspection / Adjustment (8 TON only)
[ 8 TON only ]
1. Close the fuel gas valve.
2. Hold and pull the caps to remove the cables
(3 places).
NOTE) Do not pull the cable.
3. Remove 3 spark plugs with plug wrench.
4. Remove the cylinder head cover.
1) Unscrew a bolt to remove the blow-by hose.
2) Unscrew 3 nuts to remove the cylinder head cover.
5. Wipe out the oil on the contact surface between the
removed cover and cylinder head.
6. Turn the crank pulley by hand, and align the top dead
center mark on the crank pulley with the top dead
center mark on the engine block.
7. Check that the intake rocker arm of No. 1 cylinder
does not move when the crank pulley is turned
approximately 60˚ clockwise and counterclockwise.
(Set No. 1 cylinder to the top dead center.)
NOTE) If the intake rocker arm of No. 1 cylinder
moves, turn the crank pulley by another 1
revolution so that the top dead center marks
align with each other again.
8. At the top dead center, adjust the intake valve clear-
ance on No. 1 and No. 3 cylinders and exhaust valve
clearance on No. 1 and No. 2 cylinders by loosening
the adjustment nuts as shown in the illustration.
9. Turn the crank pulley by 1 revolution by hand so that
the top dead center marks align with each other
again.
10. Adjust the intake valve clearance on No. 2 cylinder
and exhaust valve clearance on No. 3 cylinder by
loosening the adjustment nuts as shown in the illus-
tration.
Caps
Spark plugs
Blow-by hose
Bolt
Cylinder head cover
Nuts
Top dead center marks
FRONT side
No.3 exhaust
No.3 intake
No.2 exhaust
No.2 intake
No.1 exhaust
No.1 intake
Front side
Rear side
Adjustment nuts
Front side
Standard value
0.014 ± 0.002 inch(0.35 ± 0.05 mm) When the engine is hot.
0.010 ± 0.002 inch(0.25 ± 0.05 mm) When the engine is cold.
To Next Page
Loading...
Need help?
General