13530886

1.

Remove the cylinder head cover.

(Refer to Cylinder Head Assembly - "Cylinder Head Cover")

2.

Set the piston of No.1 cylinder to the TDC (top dead center) on compression stroke.

(1)

Turn the crankshaft pulley clockwise and align its groove with the timing mark of the timing chain cover.

note

Do not rotate engine counterclockwise.

(2)

Check that the TDC marks of the intake CVVT sprocket and exhaust camshaft sprocket are in straight line on the cylinder head surface as shown in the illustration.

caution

If not, turn the crankshaft one revolution (360°). (Do not rotate engine counterclockwise.)

3.

Inspect the valve clearance.

Valve clearance

Intake :

0.17 ~ 0.23 mm (0.0067 ~ 0.0091 in.)

Exhaust :

0.25 ~ 0.31 mm (0.0098 ~ 0.0122 in.)

(1)

Check only the intake valves of the 1st and 2nd cylinders and exhaust valves of the 1st and 3rd cylinders for their clearance.

A.

Using a thickness gauge, measure the clearance between the tappet and the base circle of camshaft.

B.

Record the out-of-specification valve clearance measurements. They will be used later to determine the required tappet for adjusting.

Valve clearance specification (Engine coolant temperature : 20°C [68°F])

(2)

Turn the crankshaft pulley one revolution (clockwise 360°) and align its groove with timing mark of the timing chain cover.

(3)

Check the intake valves of the 3rd and 4th cylinders and exhaust valves of the 2nd and 4th cylinders for their clearance.

4.

Adjust the intake and exhaust valve clearance.

(1)

Remove the intake and exhaust camshafts.

(Refer to Cylinder Head Assembly - "Camshaft")

(2)

Remove the tappet(s) in out-of-specification valve clearance from the cylinder head.

(3)

Measure the thickness of the removed tappet using a micrometer.

(4)

Calculate the thickness of a new tappet so that the valve clearance comes within the specificified value.

Intake : N = T + [A - 0.20 mm (0.0079 in.)]

Exhaust : N = T + [A - 0.28 mm (0.0110 in.)]

N : Thickness of new tappet

T : Thickness of removed tappet

A : Measured valve clearance

(5)

Select a new tappet with a thickness as close as possible to the caculated value.

caution

Tappets are available in 41 size increments of 0.015 mm (0.0006 in.) from 3.000 mm (0.1181 in.) to 3.600 mm (0.1417in.).

(6)

Place a new tappet on the cylinder head.

(7)

Install the intake and exhaust camshafts.

(Refer to Cylinder Head Assembly - "Camshaft")

(8)

Recheck the valve clearance.

5.

Install the cylinder head cover.

(Refer to Cylinder Head Assembly - "Cylinder Head Cover")