Valve Clearance: Adjustments

1ZZ-FE ENGINE MECHANICAL: VALVE CLEARANCE:

ADJUSTMENT

1. DISCONNECT BATTERY NEGATIVE TERMINAL
2. REMOVE ENGINE UNDER COVER RH
3. REMOVE CYLINDER HEAD COVER NO.2
(a) Remove the cylinder head cover No. 2 (Removal).
4. REMOVE IGNITION COIL ASSEMBLY
(a) Remove the ignition coil assembly (Removal).
5. REMOVE CYLINDER HEAD COVER SUB-ASSEMBLY
(a) Remove the cylinder head cover sub-assembly (Removal).
6. SET NO. 1 CYLINDER TO TDC / COMPRESSION
(a) Set the No. 1 cylinder to the 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.
Valve clearance (Cold):
Intake
0.15 to 0.25 mm (0.0059 to 0.0098 in.)
Exhaust
0.25 to 0.35 mm (0.0098 to 0.0138 in.)
(2) Record any out-of-specification valve clearance measurements. They will be used later to determine the required replacement valve lifters.
(b) Turn the crankshaft 1 revolution (360°) to 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.
Valve clearance (Cold):
Intake
0.15 to 0.25 mm (0.0059 to 0.0098 in.)
Exhaust
0.25 to 0.35 mm (0.0098 to 0.0138 in.)
(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) Remove the No. 2 camshaft (Removal).
(b) Remove the camshaft (Removal).
(c) Remove the valve lifters.





(d) Using a micrometer, measure the thickness of the removed valve lifters.
(e) Calculate the thickness of a new lifter so that the valve clearance comes within the specified values.





Valve clearance:
Intake
A = B + (C - 0.20 mm (0.0079 in.))
Exhaust
A = B + (C - 0.30 mm (0.0118 in.))





HINT:
- Select a new lifter with a thickness as close to the calculated values as possible.
- Lifters are available in 35 sizes in increments of 0.020 mm (0.0008 in.), from 5.060 mm (0.1992 in.) to 5.740 mm (0.2260 in.).
- Refer to the New Lifter Thickness table.





Intake valve clearance (Cold):
0.15 to 0.25 mm (0.0059 to 0.0098 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. 46 lifter.

New Lifter Thickness mm (in.)









Exhaust valve clearance (Cold):
0.25 to 0.35 mm (0.0098 to 0.0138 in.)
EXAMPLE:
The 5.340 mm (0.2102 in.) lifter is installed, and the measured clearance is 0.440 mm (0.0173 in.).
Replace the 5.340 mm (0.2102 in.) lifter with a new No. 48 lifter.

New Lifter Thickness mm (in.)





(f) Install the camshaft (Installation).
(g) Install the No. 2 camshaft (Installation).
9. INSTALL CYLINDER HEAD COVER SUB-ASSEMBLY
(a) Install the cylinder head cover sub-assembly (Installation).
10. INSTALL IGNITION COIL ASSEMBLY
(a) Install the ignition coil assembly (Installation).
11. CONNECT BATTERY NEGATIVE TERMINAL
Torque: 5.4 Nm (55 kgf-cm, 48 in-lbf)
12. CHECK ENGINE OIL LEAKAGE
13. INSTALL CYLINDER HEAD COVER NO.2
(a) Install the cylinder head cover No. 2 (Installation).
14. INSTALL ENGINE UNDER COVER RH