Valve Clearance: Inspection

HINT:

Inspect and adjust the valve clearance when the engine is cold.

DRAIN ENGINE COOLANT
REMOVE BATTERY CLAMP COVER
REMOVE V-BANK COVER
REMOVE AIR CLEANER AND INTAKE AIR CONNECTOR ASSEMBLY
REMOVE NO. 3 TIMING BELT COVERS (See REMOVAL )
REMOVE IGNITION COILS (See REMOVAL )
REMOVE RH CYLINDER HEAD COVER
Remove the 9 bolts, the 9 seal washers and the cylinder head cover.
REMOVE LH CYLINDER HEAD COVER
1. Remove the oil dipstick for the transmission.
2. Disconnect the PCV hose.
3. Disconnect the engine wire clamp from the wire bracket on the cylinder head cover.
4. Remove the 9 bolts, the 9 seal washers and the cylinder head cover.
SET NO. 1 CYLINDER TO TDC/COMPRESSION
1. Turn the crankshaft pulley, and align its groove with timing mark "0" of the No. 1 timing belt cover.
  
  Fig 1: Aligning Crankshaft Pulley Groove With Timing Mark "0"
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. Check that the timing marks of the camshaft timing pulleys and that of the timing belt rear plates are aligned.
  If not, turn the crankshaft 1 revolution (360°) and align the mark as shown in Fig 2 .
  
  Fig 2: Identifying Timing Mark
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
INSPECT VALVE CLEARANCE
1. Check only the valves indicated.
  - Using a feeler gauge, measure the clearance between the valve lifter and the camshaft.
  - Record the out-of-specification valve clearance measurements. They will be used later to determine the required replacement adjusting shim.
  Valve clearance (Cold):
  1. Intake 0.15 - 0.25 mm (0.006 - 0.010 in.)
  2. Exhaust 0.25 - 0.35 mm (0.010 - 0.014 in.)
2. Turn the crankshaft 1 revolution (360°) and align the mark as shown in Fig 3 (See procedure in step 9).
3. Check only the valves indicated as shown in Fig 3 . Measure the valve clearance (See procedure in step ( a)).
ADJUST VALVE CLEARANCE
1. Remove the timing belt (See REMOVAL ).
2. Remove the camshafts (See DISASSEMBLY ).
3. Remove the valve lifter and adjusting shim.
  
  Fig 4: Adjusting Valve Clearance
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
4. Determine the replacement adjusting shim size according to the following Formula and Tables:
  - Using a micrometer, measure the thickness of the removed shim.
  - Calculate the thickness of a new shim so that the valve clearance comes within the specified value.
    T ........... Thickness of removed shim
    
    A ........... Measured valve clearance
    
    N ........... Thickness of new shim
    
    Fig 5: Measuring Thickness Of Shim Using Micrometer
    Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. Intake: N = T + (A - 0.20 mm (0.008 in.))
    2. Exhaust: N = T + (A - 0.30 mm (0.012 in.))
  - Select a new shim with the closest 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 in.).
5. Place a new adjusting shim on the valve.
6. Place the valve lifter.
7. Reinstall the camshafts (See REASSEMBLY ).
8. Reinstall the timing belt (See INSTALLATION ).
9. Recheck the valve clearance.
REINSTALL CYLINDER HEAD COVERS
REINSTALL IGNITION COILS
REINSTALL NO. 3 TIMING BELT COVERS (See INSTALLATION )
REINSTALL AIR CLEANER AND INTAKE AIR CONNECTOR ASSEMBLY
REFILL WITH ENGINE COOLANT
START ENGINE AND CHECK FOR LEAKS
RECHECK ENGINE COOLANT LEVEL
REINSTALL V-BANK COVER
REINSTALL BATTERY CLAMP COVER

Fig 6: Adjusting Shim Selector Table (Intake)

Fig 7: Adjusting Shim Selector Table (Exhaust)