Valve Clearance: Adjustments
ADJUSTMENTHINT: Inspect and adjust the valve clearance when the engine is cold.
1. REMOVE CYLINDER HEAD COVER
2. SET NO.1 CYLINDER TO TDC/COMPRESSION
a. Turn the crankshaft pulley, and align its groove with the timing mark "0" of the timing chain cover.
b. Check that both timing marks on the camshaft timing sprocket and valve timing controller assembly are facing right as shown in the illustration.
If not, turn the crankshaft 1 revolution (360°) and align the marks as above.
3. INSPECT VALVE CLEARANCE
a. Check only the valves indicated.
- Using a feeler gauge, measure the clearance between the valve lifter and camshaft.
- Record the out-of-specification valve clearance measurements. They will be used later to determine the required replacement adjusting shim.
Valve clearance (Cold):
Intake: 0.15 - 0.25 mm (0.006 - 0.010 inch)
Exhaust: 0.25 - 0.35 mm (0.010 - 0.014 inch)
b. Turn the crankshaft 1 revolution (360°) and align the mark as above. (See procedure in step 2)
c. Check only the valves indicated as shown. Measure the valve clearance. (See procedure in step a.)
4. ADJUST VALVE CLEARANCE
a. Set the No.1 cylinder to the TDC/compression (See procedure in step 2).
b. Place matchmarks on the timing chain and camshaft timing sprockets.
c. Remove the 2 plug from the timing chain cover.
d. Using drivers or equipment, while rotating the stopper plate of the tensioner downward, turn the exhaust camshaft right a little and push in the plunger of the chain tensioner as shown in the illustration.
HINT: When the stopper plate cannot be lowered easily, rotate the exhaust camshaft right and left a little.
e. Insert a bar of [0] 2 - 3 mm (0.08 - 0.12 inch) into the holes in the stopper plate and tensioner to fix the stopper plate.
HINT:
- At this time, it is easier to fix by installing the bar while rotate the camshaft right and left a little.
- Fix the bar with tape so that the bar does not come off.
f. Remove the timing chain from the camshaft timing sprocket.
NOTICE:
- Never rotate the crankshaft with the timing chain removed.
- When rotating the camshaft with the timing chain removed, rotate the crankshaft counterclockwise 40° from the TDC and align the oil jet hole with the paint mark before rotating it.
- When installing the timing chain, make sure to return it to the position of the matchmarks for camshaft and then rotate the crankshaft clockwise to return.
HINT: When the chain cannot be removed easily, rotate the intake camshaft right and left a little.
g. Hold the hexagonal portion of the camshaft with a wrench, and remove the bolt and valve timing controller assembly with the chain.
NOTICE: Do not disassembled the valve timing controller assembly.
h. Remove the intake and exhaust camshaft assembly.
HINT: When disconnect the timing chain from the camshaft timing sprocket, holding the timing chain.
i. Tie the timing chain with a string as shown in the illustration.
NOTICE:
- Be careful not to drop anything inside the timing chain cover.
- Do not allow the chain to come into contact with water or dust.
j. Remove the valve lifters.
Lifter Selection Chart (Intake)
Lifter Selection Chart (Exhaust)
k. Determine the replacement valve lifter size according to these Formula or Charts:
- Using a micrometer, measure the thickness of the removed lifter.
- Calculate the thickness of a new lifter so the valve clearance comes within the specified value.
T: Thickness of used lifter
A: Measured valve clearance
N: Thickness of new lifter
Intake: N = T + (A - 0.20 mm (0.008 inch))
Exhaust: N = T + (A - 0.30 mm (0.012 inch))
- Select a new lifter with a thickness as close as possible to the calculated values.
HINT: Lifter are available in 35 sizes in increments of 0.020 mm (0.0008 inch), from 5.060 mm (0.1992 inch) to 5.740 mm (0.2260 inch).
l. Reinstall the valve lifters.
m. Align the crankshaft pulley groove with the timing mark "0" of the timing chain cover.
n. Hold the timing chain, and place the exhaust camshaft and timing sprocket assembly.
o. Align the matchmarks on the timing chain and camshaft timing sprocket.
p. Reinstall the intake camshaft, valve timing controller assembly and camshaft bearing caps.
q. Remove the bar from the timing chain tensioner.
r. Check that both timing marks on the camshaft timing sprocket and valve timing controller assembly are facing right as shown in the illustration.
s. Check that the matchmarks on the timing chain and camshaft timing sprockets.
t. Install a new plug to the timing chain cover.
Torque: 15 Nm (150 kgf-cm, 11 ft. lbs.)
u. Recheck the valve clearance.
v. Check the valve timing.
5. REINSTALL CYLINDER HEAD COVER