ENGINE
L3301, L3901, L4701, WSM
1-S66
Free Length and Tilt of Valve Spring
1. Measure the free length (B) of valve spring with a vernier
calipers.
2. If the measurement is less than the allowable limit, replace it.
3. Put the valve spring on a surface plate, and put a square on the
side of the valve spring.
4. Make sure that the full side is in contact with the square.
5. Turn the valve spring to measure the maximum tilt (A).
6. If the measurement is more than the allowable limit, replace it.
7. Check the full surface of the valve spring for scratches.
8. If there is a problem, replace it.
9Y1211012ENS0079US0
Setting Load of Valve Spring
1. Put the valve spring on a tester.
2. Compress the valve spring to the specified setting length.
3. Read the compression load on the gauge.
4. If the measurement is less than the allowable limit, replace the
valve spring.
9Y1211012ENS0080US0
Oil Clearance between Rocker Arm and Rocker Arm Shaft
1. Measure the rocker arm shaft O.D. with an external micrometer.
2. Measure the rocker arm I.D. with an internal micrometer.
3. Calculate the oil clearance.
4. If the oil clearance is more than the allowable limit, replace the
rocker arm and measure the oil clearance again.
5. If the oil clearance stays more than the allowable limit, replace
the rocker arm shaft also.
9Y1211012ENS0081US0
Tilt (A) Allowable limit
1.0 mm
0.039 in.
Free length (B)
Factory specification
41.7 to 42.2 mm
1.65 to 1.66 in.
Allowable limit
41.2 mm
1.62 in.
(A)Tilt (B)Free Length
Setting load /
Setting length
Factory specification
118 N / 35.0 mm
12.0 kgf / 35.0 mm
26.5 lbf / 1.38 in.
Allowable limit
100 N / 35.0 mm
10.2 kgf / 35.0 mm
22.5 lbf / 1.38 in.
Oil clearance between
rocker arm and rocker
arm shaft
Factory specification
0.016 to 0.045 mm
0.00063 to 0.0017 in.
Allowable limit
0.10 mm
0.0039 in.
Rocker arm shaft O.D. Factory specification
13.973 to 13.984 mm
0.55012 to 0.55055 in.
Rocker arm I.D. Factory specification
14.000 to 14.018 mm
0.55119 to 0.55188 in.
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