Valve Clearance: Adjustments
ADJUSTMENTHINT: Inspect and adjust the valve clearance when the engine is cold.
1. REMOVE RH ENGINE UNDER COVER
2. REMOVE AIR CLEANER ASSEMBLY
3. REMOVE CYLINDER HEAD COVER
4. SET NO. 1 CYLINDER TO TDC/COMPRESSION
a Turn the crankshaft pulley, and align its groove with timing mark 0 of the timing chain cover.
b Check that the timing marks of the camshaft timing sprocket and VVT timing sprocket are aligned with the timing marks of the No. 1 and No. 2 bearing caps as shown in the illustration. If not, turn the crankshaft 1 revolution (360°) and align the marks.
5. 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 valve lifter.
Valve clearance (Cold)
b Turn the crankshaft 1 revolution (360°) and align the mark (See step 4).
c Check only the valves indicated as shown. Measure the valve clearance (See step (a)).
6. ADJUST VALVE CLEARANCE
a Set the No. 1 cylinder to the TDC/compression (See step 4).
b Place matchmarks on the timing chain and camshaft timing sprockets.
c Remove the 2 nuts, gasket and chain tensioner.
d Hold the hexagonal head portion of the camshaft with a wrench, and loosen the camshaft timing sprocket bolt.
NOTICE: Be careful not to damage the cylinder head and valve lifter with the wrench.
e Uniformly loosen and remove the 10 camshaft bearing cap bolts in several passes, in the sequence shown.
f Remove the 5 camshaft bearing caps.
g Raising the camshaft, remove the camshaft timing sprocket bolt.
h Disconnect the camshaft timing sprocket together with the timing chain from the exhaust camshaft.
i Remove the camshaft timing sprocket from the timing chain.
j Uniformly loosen and remove the 10 camshaft bearing cap bolts in several passes, in the sequence shown.
k Remove the 5 camshaft bearing caps.
l Disconnect the timing chain from the VVT timing sprocket, and remove the intake camshaft with the VVT timing sprocket.
m 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.
n Remove the valve lifter.
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
- Select a new lifter with a thickness as close as possible to the calculated values.
HINT:
- Valve 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).
- Identification number inside the valve lifter shows the value of the 2 decimal places. (The illustration shows 5.380 mm (0.2118 inch)
Valve Lifter Selection Chart (Intake)
Valve Lifter Selection Chart (Exhaust)
p Apply a light coat engine oil to new valve lifter.
q Reinstall the valve lifter.
r Align the crankshaft pulley groove with timing mark 0 of the timing chain cover.
s Hold the timing chain.
7. REINSTALL INTAKE CAMSHAFT
a Align the matchmarks on the timing chain and VVT timing sprocket (See step 6 (b)), and place the intake camshaft on the cylinder head.
b Apply a light coat engine oil on the threads and under the camshaft bearing cap bolts.
c Install the 5 intake camshaft bearing caps in their proper locations.
d Uniformly tighten the 10 bearing cap bolts in several passes, in the sequence shown.
Torque:
29.5 Nm (300 kgf-cm, 22 ft. lbs.) for bolt A
9 Nm (90 kgf-cm, 80 inch lbs.) for others
e Align the matchmarks on the timing chain and camshaft timing sprocket (See step 6 (b)), and install them.
8. REINSTALL EXHAUST CAMSHAFT
a Temporarily install the camshaft timing sprocket with the timing chain to the exhaust camshaft with the bolt.
b Place the exhaust camshaft on the cylinder head.
c Apply a light coat engine oil on the threads and under the camshaft bearing cap bolts.
d Install the 5 exhaust camshaft bearing caps in their proper locations.
e Uniformly tighten the 10 bearing cap bolts in several passes, in the sequence shown.
Torque:
29.5 Nm (300 kgf-cm, 22 ft. lbs.) for bolt A
9 Nm (90 kgf-cm, 80 inch lbs.) for others
f Hold the hexagon head portion of the exhaust camshaft with a wrench, and tighten the bolt.
Torque: 54 Nm (550 kgf-cm, 40 ft. lbs.)
g Check that the each sprocket aligned with the matchmarks as shown in the illustration.
h Install the chain tensioner.
i Recheck the valve clearance (See step 5).
j Check the valve timing.
9. REINSTALL CYLINDER HEAD COVER
10. REINSTALL AIR CLEANER ASSEMBLY
11. REINSTALL RH ENGINE UNDER COVER