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 up 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) Rotate the crankshaft counterclockwise 40° from the TDC.
d) Remove the plug from the timing chain cover.
e) Using driver to hold the stopper plate of tensioner above the chain tensioner service hole.
f) Turn the exhaust camshaft a little clockwise.
g) Remove the driver from the chain tensioner service hole to lower the stopper plate, then insert the bar of 2 - 3 mm (0.08 - 0.12 inch).
NOTICE:
^ When the bar does not get inserted, turn the exhaust camshaft a little counterclockwise, then clockwise to insert it.
^ Fix the bar with tape or others so that it does not be dropped off.
h) Hold the hexagonal portion of camshaft with a wrench, and loosen the bolt for camshaft timing sprocket.
i) Remove the 19 bolts, No. 1 and No. 2 camshaft bearing caps.
j) Remove the bolt and valve timing sprocket with the chain.
k) 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.
l) Remove the intake and exhaust camshaft assembly.
HINT: When disconnect the timing chain from the camshaft timing sprocket, holding the timing chain.
m) 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.
n) Remove the valve lifters.
o) 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).
p) Reinstall the valve lifters.
q) Align the crankshaft pulley groove with the timing mark "0" of the timing chain cover.
r) Hold the timing chain, and place the exhaust camshaft and timing sprocket assembly.
s) Align the matchmarks on the timing chain and camshaft timing sprocket.
t) Reinstall the intake camshaft, valve timing controller assembly and camshaft bearing caps.
u) Remove the bar from the timing chain tensioner.
v) Check that both timing marks on the camshaft timing sprocket and valve timing controller assembly are facing right up as shown in the illustration.
w) Check that the matchmarks on the timing chain and camshaft timing sprockets.
x) Install a new plug to the timing chain cover.
Torque: 15 Nm (150 kgf-cm, 11 ft. lbs.)
y) Recheck the valve clearance (See procedure in step 3).
z) Check the valve timing.
5. REINSTALL CYLINDER HEAD COVER