ENGINE
SM-E4B SERIES, WSM
1-S55
Free Length and Tilt of Valve Spring
1. Measure the free length (B) of valve spring with vernier calipers.
If the measurement is less than the allowable limit, replace it.
2. Put the valve spring on a surface plate, place a square on the
side of the valve spring.
3. Check to see if the entire side is in contact with the square.
Rotate the valve spring and measure the maximum tilt (A).
If the measurement exceeds the allowable limit, replace it.
4. Check the entire surface of the valve spring for scratches.
If there is any defect, replace it.
9Y1210785ENS0070US0
Valve Spring Setting Load
1. Place the valve spring on a tester and compress it to the same
length it is actually compressed the engine.
2. Read the compression load on the gauge.
3. If the measurement is less than the allowable limit, replace it.
9Y1210785ENS0071US0
Oil Clearance between Rocker Arm and Rocker Arm Shaft
1. Measure the rocker arm shaft O.D. with an outside micrometer.
2. Measure the rocker arm I.D. with an inside micrometer, and
then calculate the oil clearance.
3. If the clearance exceeds the allowable limit, replace the rocker
arm and measure the oil clearance again. If it still exceeds the
allowable limit, replace also the rocker arm shaft.
9Y1210785ENS0072US0
Tilt (A) Allowable limit
1.2 mm
0.047 in.
Free length (B)
Factory specification
31.3 to 31.8 mm
1.24 to 1.25 in.
Allowable limit
28.4 mm
1.12 in.
(A) Tilt (B) Free length
Setting load /
Setting length
Factory specification
65 N / 27.0 mm
6.6 kgf / 27.0 mm
15 lbf / 1.06 in.
Allowable limit
55 N / 27.0 mm
5.6 kgf / 27.0 mm
12 lbf / 1.06 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
0.15 mm
0.0059 in.
Rocker arm shaft O.D. Factory specification
10.473 to 10.484 mm
0.41233 to 0.41275 in.
Rocker arm I.D. Factory specification
10.500 to 10.518 mm
0.41339 to 0.41409 in.
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