Valve Clearance: Adjustments

FA20 ENGINE MECHANICAL: VALVE CLEARANCE: ADJUSTMENT; 2013 MY FR-S [03/2012 -]

1. REMOVE IGNITION COIL ASSEMBLY

Removal

2. REMOVE INJECTOR COVER (for Bank 1) Removal

3. REMOVE INJECTOR DRIVER BRACKET Disassembly

4. REMOVE CYLINDER HEAD COVER SUB-ASSEMBLY RH Disassembly

5. REMOVE CYLINDER HEAD COVER SUB-ASSEMBLY LH Disassembly

6. INSPECT VALVE CLEARANCE

NOTICE:
Inspect the valve clearance when the engine is cold.

(a) Set the No. 1 cylinder to the TDC/compression.

(1) Turn the crankshaft clockwise to align the timing mark on the crankshaft pulley with the indicator of the timing chain cover.









(b) At this time, check that the intake camshaft and exhaust camshaft do not depress the No. 1 cylinder intake side No. 1 valve rocker arm sub-assembly (intake valve) and exhaust side No. 1 valve rocker arm sub-assembly (exhaust valve).

HINT
If the No. 1 valve rocker arm sub-assembly (valve) is depressed, turn the crank pulley by 360° in order to make the No. 1 cylinder piston at TDC/compression.

(c) Inspect the valve clearance indicated in the illustration.









(d) Measure the clearance between the surface of the cam base circle and the roller surface of the No. 1 valve rocker arm sub-assembly using a feeler gauge.

Standard Valve Clearance (Cold):

Intake 0.10 to 0.16 mm (0.0039 to 0.0063 in.)

Exhaust 0.21 to 0.27 mm (0.0083 to 0.0106 in.)

(e) Turn the crank pulley by 360°.





(f) Inspect the valve clearance indicated in the illustration.









(g) Measure the clearance between the surface of the cam base circle and the roller surface of the No. 1 valve rocker arm sub-assembly using a feeler gauge.

Standard Valve Clearance (Cold):

Intake 0.10 to 0.16 mm (0.0039 to 0.0063 in.)

(h) Turn the crank pulley clockwise, set the No. 2 cylinder at TDC/compression, and then align the timing mark (notch) with 0° position of the timing chain cover.









(i) At this time, check that the intake camshaft and exhaust camshaft do not depress the No. 2 cylinder intake side No. 1 valve rocker arm sub-assembly (intake valve) and exhaust side No. 1 valve rocker arm sub-assembly (exhaust valve).

HINT
If the No. 1 valve rocker arm sub-assembly (valve) is depressed, turn the crank pulley by 360° in order to make the No. 2 cylinder piston at TDC/compression.

(j) Inspect the valve clearance indicated in the illustration.









(k) Measure the clearance between the surface of the cam base circle and the roller surface of the No. 1 valve rocker arm sub-assembly using a feeler gauge.

Standard Valve Clearance (Cold):

Intake 0.10 to 0.16 mm (0.0039 to 0.0063 in.)

Exhaust 0.21 to 0.27 mm (0.0083 to 0.0106 in.)

(l) Turn the crank pulley by 360°.





(m) Inspect the valve clearance indicated in the illustration.









(n) Measure the clearance between the surface of the cam base circle and the roller surface of the No. 1 valve rocker arm sub-assembly using a feeler gauge.

Standard Valve Clearance (Cold):

Intake 0.10 to 0.16 mm (0.0039 to 0.0063 in.)

7. ADJUST VALVE CLEARANCE

(a) Remove the camshaft housing sub-assembly.

Disassembly

(b) Remove the No. 1 valve rocker arm sub-assemblies.

(c) Remove the valve adjusting shims.

(d) Using a micrometer, measure the thickness of the removed valve adjusting shims.





(e) Calculate the thickness of the valve adjusting shim so that the valve clearance comes within the specified values.

Intake Side:

A = B + [C - 0.13 mm (0.0051 in.)] x 1.54

Exhaust Side:

A = B + [C - 0.24 mm (0.0094 in.)] x 1.69

A:

Required valve adjusting shim thickness

B:

Removed valve adjusting shim thickness

C:

Measured valve clearance

(f) Apply engine oil to the inner face of the valve adjusting shim, and install it to the valve.

NOTICE:
Check whether valve adjusting shim can be rotated smoothly on the valve.

(g) Install the No. 1 valve rocker arm sub-assemblies.

(h) Install the camshaft housing sub-assembly.

Reassembly

8. INSTALL CYLINDER HEAD COVER SUB-ASSEMBLY LH Reassembly

9. INSTALL CYLINDER HEAD COVER SUB-ASSEMBLY RH Reassembly

10. INSTALL INJECTOR DRIVER BRACKET Reassembly

11. INSTALL INJECTOR COVER (for Bank 1) Installation

12. INSTALL IGNITION COIL ASSEMBLY

Installation