Valve Clearance: Service and Repair
INSPECTIONHINT: Inspect and adjust the valve clearance when the engine is cold.
1. Remove RH fender apron seal.
2. Drain engine coolant.
3. Remove V-Bank cover.
a. Using a 5 mm hexagon wench, 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 Top Dead Center (TDC) Compression Stroke.
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):
Intake: 0.15 - 0.25 mm (0.006 - 0.010 inch)
Exhaust: 0.25 - 0.35 mm (0.010 - 0.014 inch)
b. Turn the crankshaft 2/3 of a revolution (240°), and check only the valves indicated in the illustration. Measure the valve clearance. (See step (a))
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. (See step (a))
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) 09248 - 55040 (09248 - 05410, 09248 - 05420) or equivalent, (A), press down the valve lifter and place (SST) (B) between the camshaft and valve lifter. Remove (SST) (A).
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 this Formula or the Selection 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).
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 RH fender apron seal.
Shim Selection Charts
Intake Valve Shims
Exhaust Valve Shims