Valve Clearance: Adjustments

2AZ-FE ENGINE MECHANICAL: VALVE CLEARANCE: ADJUSTMENT

ADJUSTMENT

1. REMOVE REAR 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.
(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 the TDC/compression.






(c) Check only the valves indicated.
(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 No. 1 cylinder to TDC/compression Removal.
(b) Remove the No. 1 chain tensioner Removal.
(c) Loosen the camshaft timing 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 values.
New lifter thickness:










CALCULATION EXAMPLE (Intake):
1 Measured intake valve clearance = 0.40 mm (0.0158 in.)
(Measured - Specification = Excess clearance)
1. 0.40 mm (0.0158 in.) - 0.24 mm (0.0095 in.) = 0.16 mm (0.0063 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)
1. 0.16 mm (0.0063 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 (0.0008 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 (0.0075 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 (0.020 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 ENGINE OIL LEAK
13. INSPECT IGNITION TIMING Engine

14. INSTALL NO. 1 ENGINE COVER SUB-ASSEMBLY Installation

15. INSTALL REAR ENGINE UNDER COVER RH