Valve Clearance: Adjustments
INSPECTIONHINT: Inspect and adjust the valve clearance when the engine is cold.
1. REMOVE RIGHT-HAND FENDER APRON SEAL
2. DRAIN ENGINE COOLANT
3. REMOVE V-BANK COVER
a. Using a 5 mm hexagon wrench, remove the 2 nuts.
b. Disconnect the 2 clips, and remove the cover.
4. REMOVE HIGH-TENSION CODE SET
5. REMOVE AIR INTAKE CHAMBER ASSEMBLY
6. REMOVE IGNITION COILS
7. DISCONNECT RADIATOR HOSE FROM WATER OUTLET
8. REMOVE CYLINDER HEAD COVERS
9. SET NO.1 CYLINDER TO TDC/COMPRESSION.
a. Turn the crankshaft pulley, and align its groove with the timing mark "0" of the No.1 timing belt cover.
b. Check that the valve lifters on the No.1 (IN and EX) are loose.
If not, turn the crankshaft 1 revolution (360°) and align the mark as above.
10. INSPECT VALVE CLEARANCE
a. Check only those valves indicated in the illustration.
^ Using a feeler gauge, measure the clearance between the valve lifter and camshaft.
^ Record out of specification valve clearance measurements. They will be used later to determine the required replacement adjusting shim.
Valve clearance (Cold):
b. Turn the crankshaft 2/3 of a revolution (240°), and check only the valves indicated in the illustration. Measure the valve clearance.
c. Turn the crankshaft a further 2/3 of a revolution (240°), and check only the valves indicated in the illustration. Measure the valve clearance.
11. ADJUST VALVE CLEARANCE
a. Remove the adjusting shim.
^ Turn the camshaft so that the cam lobe for the valve to be adjusted faces up.
^ Turn the valve lifter with a screwdriver so that the notches are perpendicular to the camshaft.
^ Using Special Service Tool(SST) (A), press down the valve lifter and place (SST) (B) between the camshaft and valve lifter. Remove SST (A).
SST 09248-55040 (09248-05410, 09248-05420)
HINT:
^ Apply SST (B) at a slight angle on the side marked with "9" or "7", at the position shown in the illustration.
^ When SST (B) is inserted too deeply, it will get pinched by the shim. To prevent it from being stuck, insert it gently from the intake side, at a slight angle.
^ Using a small screwdriver and magnetic finger, remove the adjusting shim.
b. Determine the replacement adjusting shim size according to these Formula or Charts:
^ Using a micrometer, measure the thickness of the removed shim.
^ Calculate the thickness of a new shim so the valve clearance comes within the specified value.
T: Thickness of used shim
A: Measured valve clearance
N: Thickness of new shim
Intake: N = T + (A - 0.20 mm (0.008 inch))
Exhaust: N = T + (A - 0.30 mm (0.012 inch))
^ Select a new shim with a thickness as close as possible to the calculated values.
HINT: Shims are available in 17 sizes in increments of 0.050 mm (0.0020 inch), from 2.500 mm (0.0984 inch) to 3.300 mm (0.1299 inch).
c. Install a new adjusting shim.
^ Place a new adjusting shim on the valve lifter, with imprinted numbers facing down.
^ Press down the valve lifter with SST (A), and remove SST (B).
SST 09248-55040 (09248-05410, 09248-05420)
d. Recheck the valve clearance.
12. REINSTALL CYLINDER HEAD COVERS
13. CONNECT RADIATOR HOSE TO WATER OUTLET
14. REINSTALL IGNITION COILS
15. REINSTALL AIR INTAKE CHAMBER ASSEMBLY
16. INSTALL HIGH-TENSION CORD SET
17. INSTALL V-BANK COVER
18. REFILL WITH ENGINE COOLANT
19. START ENGINE AND CHECK FOR LEAKS
20. REINSTALL RIGHT-HAND FENDER APRON SEAL
Adjusting Shim Selection Chart (Intake)
Adjusting Shim Selection Chart (Exhaust)