VALVE CLEARANCE ADJUSTMENT
PROCEDURE
REMOVE INLET NO. 1 AIR CLEANER
REMOVE AIR CLEANER CAP SUB-ASSEMBLY
REMOVE AIR CLEANER FILTER ELEMENT SUB-ASSEMBLY
REMOVE NO. 1 IGNITION COIL
SEPARATE DUTY VACUUM SWITCHING VALVE
REMOVE CYLINDER HEAD COVER SUB-ASSEMBLY
REMOVE CYLINDER HEAD COVER GASKET
SET NO. 1 CYLINDER TO TDC/EXHAUST
INSPECT VALVE CLEARANCE
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*a
Intake Side
*b
Exhaust Side
Check only the valves indicated.
Using a feeler gauge, measure the clearance between the valve lifter and camshaft.
Valve Clearance (Cold)
Intake Side
0.145 to 0.235 mm (0.00571 to 0.00925 in.)
Exhaust Side
0.275 to 0.365 mm (0.01083 to 0.01437 in.)
Tip:Insert the feeler gauge from the spark plug side (center).
Record any out-of-specification valve clearance measurements. They will be used later to determine the required replacement valve lifters.
Turn the crankshaft 1 revolution (360°).
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*a
Intake Side
*b
Exhaust Side
Check only the valves indicated.
Using a feeler gauge, measure the clearance between the valve lifter and camshaft.
Valve Clearance (Cold)
Intake Side
0.145 to 0.235 mm (0.00571 to 0.00925 in.)
Exhaust Side
0.275 to 0.365 mm (0.01083 to 0.01437 in.)
Tip:Insert the feeler gauge from the spark plug side (center).
Record any out-of-specification valve clearance measurements. They will be used later to determine the required replacement valve lifters.
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ADJUST VALVE CLEARANCE
Remove the camshaft and No. 2 camshaft.
Remove the valve lifters.
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Using a micrometer, measure the thickness of the removed valve lifters.
Calculate the thickness of a new lifter so that the valve clearance comes within the specified value.
A
Thickness of new lifter
B
Thickness of used lifter
C
Measured valve clearance
Valve Clearance
Intake A = B + (C - 0.18 mm (0.0071 in.))
Exhaust A = B + (C - 0.31 mm (0.0122 in.))
Tip:Select a new lifter with a thickness as close to the calculated values as possible.
Lifters are available in 29 sizes in increments of 0.020 mm (0.0008 in.), from 5.12 mm (0.2016 in.) to 5.68 mm (0.2236 in.).
Refer to the following Valve Lifter Selection Charts.
Install the valve lifters.
Install the camshaft and No. 2 camshaft.
Tip:Table 1. New Lifter Thickness mm (in.) Lifter No.
Thickness
Lifter No.
Thickness
Lifter No.
Thickness
12
5.12 (0.2016)
32
5.32 (0.2094)
52
5.52 (0.2173)
14
5.14 (0.2024)
34
5.34 (0.2102)
54
5.54 (0.2181)
16
5.16 (0.2031)
36
5.36 (0.2110)
56
5.56 (0.2189)
18
5.18 (0.2039)
38
5.38 (0.2118)
58
5.58 (0.2197)
20
5.20 (0.2047)
40
5.40 (0.2126)
60
5.60 (0.2205)
22
5.22 (0.2055)
42
5.42 (0.2134)
62
5.62 (0.2213)
24
5.24 (0.2063)
44
5.44 (0.2142)
64
5.64 (0.2220)
26
5.26 (0.2071)
46
5.46 (0.2150)
66
5.66 (0.2228)
28
5.28 (0.2079)
48
5.48 (0.2157)
68
5.68 (0.2236)
30
5.30 (0.2087)
50
5.50 (0.2165)
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INSTALL CYLINDER HEAD COVER GASKET
INSTALL CYLINDER HEAD COVER SUB-ASSEMBLY
CONNECT DUTY VACUUM SWITCHING VALVE
INSTALL NO. 1 IGNITION COIL
INSTALL AIR CLEANER FILTER ELEMENT SUB-ASSEMBLY
INSTALL AIR CLEANER CAP SUB-ASSEMBLY
INSTALL INLET NO. 1 AIR CLEANER
CHECK ENGINE OIL LEVEL
INSPECT FOR OIL LEAK