1D
Valve Lash (Clearance) Inspection
Measurement of Valve Lash (Clearance)
1) Disconnect negative (–) cable at battery.
2) Remove cylinder head cover referring to Cylinder Head Cover Removal and Installation:K9K .
3) Turn crankshaft pulley clockwise until cam lobes become perpendicular to tappet faces at valves “1” and “6” as shown in the figure.
4) Measure valve lashes with thickness gauge (1) according to the following procedure.
a) Check valve lashes at valves “1” and “6”.
b) Turn camshaft by 90° (by turning crankshaft with wrench).
c) Make sure that cam lobes are perpendicular to tappet faces at valves to be checked (in this case, “5” and “8”), if not, adjust it by turning crankshaft. Check valve lashes.
d) In the same manner as b) – c), check valve lashes at valves “4” and “7”.
e) In the same manner as b) – c), check valve lashes at valves “2” and “3”.
If valve lash (clearance) is out of specification, record valve lash (clearance) and adjust it to specification by replacing tappet. Refer to Replacement of Tappet .
Valve lash (clearance) specification
When cold :
• Intake : 0.125 – 0.250 mm (0.00493 – 0.00984 in.)
• Exhaust : 0.325 – 0.450 mm (0.01280 – 0.01771 in.)
Replacement of Tappet
1) Measure valve lashes referring to Measurement of Valve Lash (Clearance) .
2) Remove tappet referring to Camshaft and Tappet Removal and Installation:K9K .
3) Using micrometer, measure the thickness of the removed tappet, and determine replacement tappet by calculating the thickness of new tappet with the following formula and table.
Intake side
A = B + C – 0.1875 mm (0.007382 in.)
Exhaust side
A = B + C – 0.3875 mm (0.015256 in.)
A: Thickness of new tappet
B: Thickness of removed tappet
C: Measured valve lash (clearance)
Example of intake side:
When thickness of removed tappet is 7.8875 mm (0.310531 in.), and measured valve lash (clearance) is 0.200 mm (0.00787 in.).
A = 7.8875 mm (0.310531 in.) + 0.200 mm (0.00787 in.) – 0.1875 mm (0.007382 in.) = 7.900 mm (0.31102 in.)
Calculated thickness of new tappet = 7.900 mm (0.31102 in.)
4) Select new tappet (1) with a thickness as close as possible to calculated value.
Available new tappets
Thickness mm (in.) Thickness mm (in.)
7.550 mm (0.29724 in.) 7.875 mm (0.31004 in.)
7.575 mm (0.29823 in.) 7.900 mm (0.31102 in.)
7.600 mm (0.29921 in.) 7.925 mm (0.31201 in.)
7.625 mm (0.30020 in.) 7.950 mm (0.31299 in.)
7.650 mm (0.30118 in.) 7.975 mm (0.31398 in.)
7.675 mm (0.30217 in.) 8.000 mm (0.31496 in.)
7.700 mm (0.30315 in.) 8.025 mm (0.31595 in.)
7.725 mm (0.30413 in.) 8.050 mm (0.31693 in.)
7.750 mm (0.30512 in.) 8.075 mm (0.31791 in.)
7.775 mm (0.30610 in.) 8.100 mm (0.31890 in.)
7.800 mm (0.30709 in.) 8.125 mm (0.31988 in.)
7.825 mm (0.30807 in.) 8.150 mm (0.32087 in.)
7.850 mm (0.30906 in.)   
2. Tappet thickness
5) Install new tappet and camshaft referring to Camshaft and Tappet Removal and Installation:K9K .
6) Measure valve lashes again referring to Measurement of Valve Lash (Clearance) .
7) Install cylinder head cover referring to Cylinder Head Cover Removal and Installation:K9K .