Cam clearance (FA20)
Removal / installation
ENGINE MECHANICAL
CAM CLEARANCE (FA20)
ADJUSTMENT
1. Ignition coil ASSY removal
(Refer to 
)
)2. Removal of intake manifold protector (bank 1 side) (Refer to )
)3. Injector driver bracket removal (Refer to )
)4. Cylinder head cover SUB-ASSY removal (Refer to )
)5. Cylinder head cover SUB-ASSY LH removal (Refer to )
)6. Inspection of cam clearance
(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
| *1 |
Intake camshaft |
*2 |
Exhaust camshaft |
| *3 |
Valve rocker arm SUB-ASSY NO. 1 |
- |
- |
| *a |
Timing mark |
- |
- |
(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 cam clearance at the positions shown in the figure (#1 intake and exhaust, #3 exhaust).
Captions in illustration
| *a |
Intake side |
*b |
Exhaust side |
(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 cam clearance at the position shown in the figure (#3 intake).
Captions in illustration
| *a |
Intake side |
- |
- |
(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
| *1 |
Intake camshaft |
*2 |
Exhaust camshaft |
| *3 |
Valve rocker arm SUB-ASSY NO. 1 |
- |
- |
| *a |
Timing mark |
- |
- |
(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 cam clearance at the positions shown in the figure (#2 intake and exhaust, #4 exhaust).
Captions in illustration
| *a |
Intake side |
*b |
Exhaust side |
(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 cam clearance at the position shown in the figure (#4 intake).
Captions in illustration
| *a |
Intake side |
- |
- |
(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. Cam clearance adjustment
(1) Remove the camshaft housing SUB-ASSY.
(Refer to)
(Refer to
)(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 cam 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.
(Refer to)
(Refer to
)8. Cylinder head cover SUB-ASSY LH installation (Refer to )
)9. Cylinder head cover SUB-ASSY installation (Refer to )
)10. Injector driver bracket installation (Refer to )
)11. Installation of intake manifold protector (bank 1 side) (Refer to )
)12. Installation of ignition coil ASSY
(Refer to )
)