Valve Clearance: Adjustments
INTAKE AND EXHAUST VALVE CLEARANCE (INSPECT AND ADJUST)
[2.4L ENGINE]
NOTE:
Perform the valve clearance check and adjustment at the engine cold state.
1. Remove all of the ignition coils.
2. Remove the cylinder head cover.
CAUTION:
Turn the crankshaft always clockwise.
3. Turn the crankshaft clockwise, and align the timing mark on the exhaust camshaft sprocket against the upper face of the cylinder head as shown in Figure. Therefore, No.1 cylinder goes to the compression top dead center.
4. Using a thickness gauge, measure the valve clearance with the arrow shown in Figure. If deviated from the standard value, make note for the valve clearance.
Standard value:
Intake valve 0.20 ± 0.03 mm (0.008 ± 0.0012 inch)
Exhaust valve 0.30 ± 0.03 mm (0.012 ± 0.0012 inch)
5. Turn the crankshaft clockwise 360 degrees, and put the timing mark on the exhaust camshaft sprocket in position shown in Figure. Therefore, No.4 cylinder goes to the compression top dead center.
6. Check the valve clearance with the arrow shown in Figure. In the same procedure as 4.
7. If the valve clearance is deviated from the standard value, remove the camshaft and the valve tappet. For the camshaft removal, refer to Camshaft Removal and Installation Service and Repair.
8. Using a micrometer, measure the thickness of the removed valve tappet.
9. Calculate the thickness of the newly installed valve tappet through the following equation.
A: thickness of newly installed valve tappet
B: thickness of removed valve tappet
C: measured valve clearance
Equation
Intake valve: A = B + [C - 0.20 mm (0.008 inch)]
Exhaust valve: A = B + [C - 0.30 mm (0.012 inch)]
NOTE:
The valve tappet ranges 3,000 - 3,690 mm (0.1181 - 0.1453 inch) and has 47 types per 0.015 mm (0.0006 inch). The thickness below a decimal point is stamped on the reverse side of the valve tappet.
10. Install the valve tappet selected through the procedure 9, and put the camshaft in position. For the camshaft installation, refer to Camshaft Removal and Installation Service and Repair.
11. After installing the timing chain, measure the valve clearance using the procedure 3 to 6. Confirm the clearance is within the standard value.
CAUTION:
Completely remove all the old liquid gasket, which might be remaining among the components.
12. After completely removing the liquid gasket adhering on the timing chain case, cylinder block and cylinder head, degrease them with white gasoline.
CAUTION:
The cylinder head cover should be installed within 3 minutes of applying liquid gasket.
13. Apply a 4 mm bead of liquid gasket as illustrated.
Specified sealant:
THREE BOND 1217G or equivalent
14. Install the cylinder head cover and tighten the tightening bolts using the following procedures.
(1) Temporarily tighten to the following torque in order shown in the illustration.
Tightening torque: 3.0 ± 1.0 Nm (27 ± 9 in-lb)
(2) Tighten to the specified torque in order shown in the illustration.
Specified torque: 5.5 ± 0.5 Nm (49 ± 9 in-lb)
15. Install the ignition coils.
[3.0L ENGINE (INTAKE SIDE ONLY) ]
NOTE:
Perform the valve clearance check and adjustment at the engine cold state.
1. Remove all of the ignition coils.
2. Remove the rocker cover.
3. Turn the crankshaft clockwise until the notch on the pulley is lined up with the "T" mark on the timing indicator.
4. Valve clearance inspection and adjustment can be performed on rocker arms indicated by white arrow mark when the No. 1 cylinder piston is at the top dead center on the compression stroke, and on rocker arms indicated by black arrow mark when the No. 4 cylinder piston is at the top dead center on the compression stroke.
NOTE:
If the rocker arm of No. 6 cylinder at the intake side is moved up and down and the rocker arm is moved, No. 1 cylinder is at top dead center on compression stroke. If the rocker arm of No. 6 cylinder at the intake side is moved up and down and the rocker arm is not moved, No.
4 cylinder is at top dead center on compression stroke.
5. Measure the valve clearance for intake side.
If the valve clearance is not as specified, loosen the rocker arm lock nut and adjust the clearance using a thickness gauge while turning the adjusting screw.
Standard value (cold engine): 0.10 mm (0.004 inch)
NOTE:
Valve clearance check and adjustment is unnecessary for exhaust side due to auto lash adjuster installed.
6. While holding the adjusting screw with a screwdriver to prevent it from turning, tighten the lock nut to the specified torque.
Tightening torque: 9 ± 1 Nm (80 ± 9 in-lb)
7. Turn the crankshaft 360 degrees to line up the notch on the crankshaft pulley with the "T" mark on the timing indicator.
8. Repeat steps 5 and 6 on other valves for clearance adjustment.
9. Install the rocker cover.
10. Install the ignition coils.