Valve Clearance: Adjustments

Adjusting Shim Selection Chart (Intake)





Adjusting Shim Selection Chart (Exhaust)

VALVE CLEARANCE
ADJUSTMENT
1. REMOVE V-BANK COVER
2. REMOVE CYLINDER HEAD COVER SUB-ASSEMBLY
3. REMOVE CYLINDER HEAD COVER SUB-ASSEMBLY LH





4. SET NO. 1 CYLINDER TO TDC/COMPRESSION
a. Turn the crankshaft damper, and align its groove with timing mark 0 of the timing belt No. 1 cover.





b. Check that the timing marks (1 dot mark each) of the intake and exhaust camshaft gears (on the LH bank) are aligned.
If not, turn the crankshaft 1 revolution (360°) and align the timing marks.





5. INSPECT VALVE CLEARANCE
a. Check only the valves indicated.
1. Using a feeler gauge, measure the clearance between the valve lifter and camshaft.





Valve clearance (Cold)

2. Record valve clearance measurements that are out of the specified range. These measurements will be used later to determine the size of the adjustment shim to be installed.





b. Turn the crankshaft 1 revolution (360°) and align the mark (see step 4).
c. Check only the valves indicated as shown. Measure the valve clearance (see step (a)).
6. REMOVE CAMSHAFT
7. REMOVE NO.3 CAMSHAFT SUB-ASSEMBLY





8. ADJUST VALVE CLEARANCE
a. Using a powerful magnet, remove the valve lifter and adjusting shim.

NOTICE:
^ Since shims might drop inside the cylinder head, the operation should be performed slowly.
^ Shims should be classified by the installation.





b. Determine the replacement adjusting shim size according to these formulas and charts:
1. Using a micrometer, measure the thickness of the removed shim.





2. Calculate the thickness of a new shim so that the valve clearance is within the specified value.
T = Thickness of removed 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)
c. Select a new shim with a thickness as close as possible to the calculated value.

HINT: Shims are available in 41 increments of 0.020 mm (0.0008 inch), from 2.00 mm (0.0787 inch) to 2.80 mm (0.1102).

d. Install a new adjusting shim to the spring retainer.
e. Install the valve lifter.
9. INSTALL NO.3 CAMSHAFT SUB-ASSEMBLY
10. INSTALL CAMSHAFT
11. INSTALL CYLINDER HEAD COVER SUB-ASSEMBLY LH
12. INSTALL CYLINDER HEAD COVER SUB-ASSEMBLY