Valve Clearance: Adjustments
2AZ-FE ENGINE MECHANICAL: VALVE CLEARANCE: ADJUSTMENT
1. REMOVE ENGINE UNDER COVER RH
2. REMOVE NO. 1 ENGINE COVER SUB-ASSEMBLY Removal
3. REMOVE IGNITION COIL ASSEMBLY Removal
4. REMOVE SPARK PLUG Removal
5. REMOVE CYLINDER HEAD COVER SUB-ASSEMBLY Removal
6. SET NO. 1 CYLINDER TO TDC/COMPRESSION Removal
7. CHECK VALVE CLEARANCE
(a) Check only the valves indicated in the illustration.
(1) Using a feeler gauge, measure the clearance between the valve lifter and camshaft.
Standard Valve Clearance (Cold):
(2) Record any out-of-specification valve clearance measurements. They will be used later to determine the required replacement valve clearance lifters.
(b) Turn the crankshaft 1 revolution (360°) and set the No. 4 cylinder to TDC/compression.
(c) Check only the valves indicated in the illustration.
(1) Using a feeler gauge, measure the clearance between the valve lifter and camshaft.
Standard Valve Clearance (Cold):
(2) Record any out-of-specification valve clearance measurements. They will be used later to determine the required replacement valve lifters.
8. ADJUST VALVE CLEARANCE
(a) Set the No. 1 cylinder to TDC/compression Removal.
(b) Remove the No. 1 chain tensioner Removal.
(c) Loosen the camshaft timing gear or sprocket Removal.
(d) Remove the No. 2 camshaft Removal.
(e) Remove the camshaft Removal.
(f) Remove the valve lifters.
(g) Using a micrometer, measure the thickness of the removed valve lifters.
(h) Calculate the thickness of a new lifter so that the valve clearance comes within the specified range.
New Lifter Thickness:
CALCULATION EXAMPLE (Intake):
(1) Measured intake valve clearance = 0.40 mm (0.0157 in.)
(Measured - Specification = Excess clearance)
a. 0.40 mm (0.0157 in.) - 0.24 mm (0.00945 in.) = 0.16 mm (0.00630 in.)
(2) Measured used lifter thickness = 5.250 mm (0.2067 in.)
(3) New lifter thickness = 5.410 mm (0.2130 in.)
(Excess clearance + Used lifter thickness = Ideal new lifter)
a. 0.16 mm (0.00630 in.) + 5.250 mm (0.2067 in.) = 5.410 mm (0.2130 in.)
(4) Closest new lifter = 5.420 mm (0.2134 in.)
* Select No. 42 lifter
(i) 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 (0.000787 in.), from 5.060 to 5.740 mm (0.1992 to 0.2260 in.).
* The identification number inside the valve lifters shows the value to 2 decimal places. The illustration shows 5.420 mm (0.2134 in.).
(j) Valve lifter selection chart (intake).
New Lifter Thickness
Standard intake valve clearance (cold):
0.19 to 0.29 mm (0.00748 to 0.0114 in.)
EXAMPLE:
The 5.250 mm (0.2067 in.) lifter is installed, and the measured clearance is 0.400 mm (0.0157 in.). Replace the 5.250 mm (0.2067 in.) lifter with a new No. 42 lifter.
(k) Valve lifter selection chart (exhaust).
New Lifter Thickness
Standard exhaust valve clearance (cold):
0.38 to 0.48 mm (0.0150 to 0.0189 in.)
EXAMPLE:
The 5.340 mm (0.2102 in.) lifter is installed, and the measured clearance is 0.510 mm (0.0201 in.). Replace the 5.340 mm (0.2102 in.) lifter with a new No. 42 lifter.
(l) Install the selected valve lifter.
(m) Install the camshaft Installation.
(n) Install the No. 2 camshaft Installation.
(o) Install the No. 1 chain tensioner Installation.
9. INSTALL CYLINDER HEAD COVER SUB-ASSEMBLY Installation
10. INSTALL SPARK PLUG Installation
11. INSTALL IGNITION COIL ASSEMBLY Installation
12. INSPECT FOR OIL LEAK
13. INSPECT IGNITION TIMING Engine
14. INSTALL NO. 1 ENGINE COVER SUB-ASSEMBLY Installation
15. INSTALL ENGINE UNDER COVER RH