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INSPECTION
 
 
INTAKE V.V.T. SPROCKET
cautionNever overhaul the V.V.T. sprocket.
1. Seal with a tape all the intake camshaft ports for the advanced angle and the retarded angle.
2. Make a hole on the port for the advanced angle.
cautionFix the camshaft on a vise not to damage it.
3. Fixing the hexagonal area of the intake camshaft on a vise, install the intake V.V.T. sprocket.
cautionWhen applying air pressure, keep in mind that oil could splash.
4. By applying air pressure slowly to the holed port for the advanced angle, remove the stopper pin.
5. Turn the intake V.V.T. sprocket housing in the right and left directions. Check it smoothly moves in the range of A (approximately 20°)
noteThe stopper pin is locked in the most retarded angle position.
6. .After the check, remove the intake V.V.T. sprocket from the intake camshaft
7. Completely remove the tape sealing the intake camshaft ports for the advanced angle and for the retarded angle.
 
 
 
EXHAUST V.V.T. SPROCKET
cautionNever overhaul the V.V.T. sprocket.
1. Seal with a tape all the exhaust camshaft ports for the advanced angle and the retarded angle.
2. Make a hole on the port for the retarded angle.
cautionFix the camshaft on a vise not to damage it.
3. Fixing the hexagonal area of the exhaust camshaft on a vise, install the exhaust V.V.T. sprocket.
cautionWhen applying air pressure, keep in mind that oil could splash.
4. By applying air pressure slowly to the holed port for the retarded angle, remove the stopper pin.
5. Turn the exhaust V.V.T. sprocket housing in the right and left directions. Check it smoothly moves in the range of A (approximately 10°)
noteThe stopper pin is locked in the most advanced angle position.
6. .After the check, remove the exhaust V.V.T. sprocket from the exhaust camshaft
7. Completely remove the tape sealing the exhaust camshaft ports for the advanced angle and for the retarded angle.
 

 
 
 
 
VALVE CLEARANCE ADJUSTMENT
Measure valve clearance as described in the following procedure.
Check and adjust the valve clearance with the timing chain installed.
cautionAlways rotate the crankshaft clockwise.
1. Rotate the crankshaft clockwise to align the timing mark of the V.V.T. sprocket with the top surface of the cylinder head as illustrated. (Set the Number 1 piston at top dead center on the compression stroke.)
2. Valve clearance can be measured at the illustrated location in this condition.
3. Use a thickness gauge to measure clearance between the camshaft and valve tappet.
Standard value (when engine is cold):
  • Intake side: 0.20 ± 0.03 mm (0.008 ± 0.001 inch)
  • Exhaust side: 0.30 ± 0.03 mm (0.012 ± 0.001 inch)
4. If measured values are out of the standard value, record measured values.
5. Rotate the crankshaft by one turn clockwise to set the Number 4 piston at top dead center on the compression stroke.
noteThe timing mark of the V.V.T. exhaust sprocket must be at the illustrated position.
6. Valve clearance can be measured at the illustrated location in this condition.
7. If measured values are out of the standard value, record measured values.
8. If the measured value is out of the standard value, replace the valve tappet.
noteThere are 47 kinds of valve tappets at intervals of 0.015 mm (0.0006 inch) in the range between 3.000 (0.1181 inch) and 3.690 mm (0.1453 inch).
9. Use the following procedure select a valve tappet.
(1) Measure thickness of a removed valve tappet.
(2) Calculate thickness of a valve tappet so that valve clearance meets the standard value.
A: Thickness of valve tappet to be selected
B: Thickness of removed valve tappet
C: Measured valve clearance
Formula
Intake side: A = B + (C - 0.20 mm [0.008 inch])
Exhaust side: A = B + (C - 0.30 mm [0.012 inch])
Refer to "Removal and installation of camshaft" for removal, installation and inspection procedure of valve tappets.