Valve Clearance: Adjustments

3UZ-FE ENGINE MECHANICAL: VALVE CLEARANCE: ADJUSTMENT

ADJUSTMENT

1. REMOVE V-BANK COVER Removal
2. REMOVE CYLINDER HEAD COVER SUB-ASSEMBLY RH Removal
3. REMOVE CYLINDER HEAD COVER SUB-ASSEMBLY LH Removal
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.
Standard 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.
(c) Check only the valves indicated in the illustration. Measure the valve clearance.
Standard valve clearance (Cold):






6. REMOVE CAMSHAFT Removal
7. REMOVE NO. 3 CAMSHAFT SUB-ASSEMBLY Removal
8. ADJUST VALVE CLEARANCE





(a) Using a powerful magnet, remove the valve lifter and adjusting shim.
- Since shims might drop inside the cylinder head, the operation should be performed slowly.
- Be sure to arrange the shims in such a way that they can be reinstalled exactly as before.





(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.
New lifter thickness:










(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 in.), from 2.00 mm (0.0787 in.) to 2.80 mm (0.1102).

(d) Install a new adjusting shim to the spring retainer.
(e) Install the valve lifter.









Standard intake valve clearance (Cold):
0.15 to 0.25 mm (0.006 to 0.010 in.)
EXAMPLE:
The 2.300 mm (0.0906 in.) shim is installed, and the measured clearance is 0.440 mm (0.0173 in.). Replace the 2.300 mm (0.0906 in.) shim with a No. 54 shim.
New Shim Thickness:














Standard exhaust valve clearance (Cold):
0.25 to 0.35 mm (0.010 to 0.014 in.)
EXAMPLE:
The 2.300 mm (0.0906 in.) shim is installed, and the measured clearance is 0.440 mm (0.0173 in.). Replace the 2.300 mm (0.0906 in.) shim with a No. 44 shim.
New Shim Thickness:






9. INSTALL CAMSHAFT Installation
10. INSTALL NO. 3 CAMSHAFT SUB-ASSEMBLY Installation
11. INSTALL CYLINDER HEAD COVER SUB-ASSEMBLY RH Installation
12. INSTALL CYLINDER HEAD COVER SUB-ASSEMBLY LH Installation
13. INSTALL V-BANK COVER Installation