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 the point marks of the camshaft timing sprockets are in straight line on the timing chain cover surface 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.
1. Using a feeler gauge, measure the clearance between the valve lifter and camshaft.
2. Record the out-of-specification valve clearance measurements. They will be used later to determine the required replacement adjusting shim.
Valve clearance (Cold)
b. Turn the crankshaft 1 revolution (360°) and align the mark as above (See step 2).
c. Check only the valves indicated as shown. Measure the valve clearance (See step (a)).
4. ADJUST VALVE CLEARANCE
a. Set the No. 1 cylinder to the TDC/compression (See step 2).
b. Place matchmarks on the timing chain and camshaft timing sprockets.
c. Remove the 2 nuts and chain tensioner.
d. Remove the 2 camshaft and timing sprocket assemblies.
1. Remove the 19 bolts and 9 camshaft bearing caps.
2. Remove the 2 camshaft and timing sprocket assemblies.
e. Tie the timing chain 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.
f. Remove the valve lifter.
g. 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: Lifters 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).
h. Reinstall the valve lifter.
i. Align the crankshaft pulley groove with the timing mark O of the timing chain cover.
j. Hold the timing chain, and place the intake camshaft and timing sprocket assembly.
k. Align the matchmarks on the timing chain and camshaft timing sprocket.
l. Reinstall the 2 camshaft and timing sprocket assemblies.
m. Check that the point marks of the camshaft timing sprocket and VVT timing sprocket are in straight line on the timing chain cover surface, as shown in the illustration.
n. Check that the matchmarks on the timing chain and 2 timing sprockets.
o. Install the chain tensioner.
p. Recheck the valve clearance (See step 3).
q. Check the valve timing.
5. REINSTALL CYLINDER HEAD COVER