Valve Clearance: Adjustments
Valve clearance (FA20)Adjustment
1. Ignition coil ASSY removal
2. Intake manifold protector (bank 1 side) removal
3. Injector driver bracket removal
4. Cylinder head cover SUB-ASSY removal
5. Cylinder head cover SUB-ASSY LH removal
6. Valve clearance check
(1) Turn the crankshaft clockwise to set the NO. 1 cylinder to the top dead center of compression stroke and align the timing mark (cutout) to 0° position of the timing chain cover.
Captions in illustration
(2) At this time, make sure that the intake camshaft and exhaust camshaft do not push down the intake side valve rocker arm SUB-ASSY NO. 1 (intake valve) and exhaust side valve rocker arm SUB-ASSY NO. 1 (exhaust valve) of NO. 1 cylinder.
NOTE:
If the valve rocker arm SUB-ASSY NO. 1 (valve) is depressed, turning the crankshaft by 360° makes the piston of NO. 1 cylinder at TDC of compression stroke.
(3) Measure the valve clearance at the positions shown in the figure (#1 intake and exhaust, #3 exhaust).
Captions in illustration
(4) Measure the roller surface of cam base circle and valve rocker arm SUB-ASSY NO. 1 using a thickness gauge.
Standard value (when engine is cold): 0.10 to 0.16 mm {0.0039 to 0.0063 in} (Intake side)
0.21 to 0.27 mm {0.0083 to 0.0106 in} (Exhaust side)
(5) Turn the crankshaft pulley by 360° clockwise.
(6) Measure the valve clearance at the position shown in the figure (#3 intake).
Captions in illustration
(7) Measure the roller surface of cam base circle and valve rocker arm SUB-ASSY NO. 1 using a thickness gauge.
Standard value (when engine is cold): 0.10 to 0.16 mm {0.0039 to 0.0063 in} (Intake side)
(8) Turn the crankshaft clockwise to set the NO. 2 cylinder to the top dead center of compression stroke and align the timing mark (cutout) to 0° position of the timing chain cover.
Captions in illustration
(9) At this time, make sure that the intake camshaft and exhaust camshaft do not push down the intake side valve rocker arm SUB-ASSY NO. 1 (intake valve) and exhaust side valve rocker arm SUB-ASSY NO. 1 (exhaust valve) of NO. 2 cylinder.
NOTE:
If the valve rocker arm SUB-ASSY NO. 1 (valve) is depressed, turning the crankshaft by 360° makes the piston of NO. 2 cylinder at TDC of compression stroke.
(10) Measure the valve clearance at the positions shown in the figure (#2 intake and exhaust, #4 exhaust).
Captions in illustration
(11) Measure the roller surface of cam base circle and valve rocker arm SUB-ASSY NO. 1 using a thickness gauge.
Standard value (when engine is cold): 0.10 to 0.16 mm {0.0039 to 0.0063 in} (Intake side)
0.21 to 0.27 mm {0.0083 to 0.0106 in} (Exhaust side)
(12) Turn the crankshaft pulley by 360° clockwise.
(13) Measure the valve clearance at the position shown in the figure (#4 intake).
Captions in illustration
(14) Measure the roller surface of cam base circle and valve rocker arm SUB-ASSY NO. 1 using a thickness gauge.
Standard value (when engine is cold): 0.10 to 0.16 mm {0.0039 to 0.0063 in} (Intake side)
7. Valve clearance adjustment
(1) Remove the camshaft housing SUB-ASSY.
(2) Remove the valve adjusting shim.
(3) Measure the thickness of removed valve adjusting shim using a micrometer.
(4) Calculate the thickness of valve adjusting shim so that the valve clearance is within the standard value.
Standard value: Intake side: (Selected shim thickness) = (Removed shim thickness) + [(Measured clearance) - 0.13 mm {0.0051 in}] �1.54
Exhaust side: (Selected shim thickness) = (Removed shim thickness) + [(Measured clearance) - 0.24 mm {0.0094 in}] �1.69
(5) Apply engine oil to the inner circumference of selected valve adjusting shim and install it to the valve.
CAUTION:
After inserting the valve adjusting shim, make sure that it turns smoothly.
(6) Install the camshaft housing SUB-ASSY.
8. Cylinder head cover SUB-ASSY LH installation
9. Cylinder head cover SUB-ASSY installation
10. Injector driver bracket installation
11. Intake manifold protector (bank 1 side) installation
12. Ignition coil ASSY installation