Free Length And Tilt Of Valve Spring; Valve Spring Setting Load; Oil Clearance Between Rocker Arm And Rocker Arm Shaft - Kubota B2410 Workshop Manual

82410 • 82710 • 82910 WSM, 12271
00000F10120
1 ENGINE
Free Length and Tilt of Valve Spring
1. Measure the free length (A) 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 (B).
If the measurement exceeds the allowable limit, replace it.
Check the entire surface of the valve spring for scratches.
If there is any defect, replace it.
Factory spec.
37.0 to 37.5 mm
1.457 to 1.476 in.
Free length (A)
Allowable limit
36.5 mm
1.437 in.
I
I
1.0 mm
'-
_Ti_llt_(_B_) A_lIo_w_a_b_le_li_m_it_ _
----< ----'
. . 0.039 in.
00000510081
00000F10130
Valve Spring Setting Load
1. Place the valve spring on a tester and compress it to the same
length it is actually compressed in the engine.
2. Read the compression load on the gauge.
3. If the measurement is less than the allowable limit, replace it.
117.6 N/31.0mm
Factory spec. 12.0 kgf /31.0 mm
Setting load /
26.4 Ibs / 1.220 in.
Setting length
100.0 N /31.0 mm
Allowable limit 10.2 kgf/ 31.0 mm
22.5 Ibs / 1.220 in.
00000F10140
00000510091
Oil Clearance between Rocker Arm and Rocker Arm Shaft
1. Measure the rocker arm shaft 0.0. with an outside micrometer.
2. Measure the rocker arm 1.0. with an inside micrometer, and then
calculate the oil clearance.
3. If the oil 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.
Factory spec.
0.016 to 0.045 mm
Oil clearance between
0.00063 to 0.00177 in.
rocker arm and rocker
arm shaft
Allowable limit
0.10 mm
0.0039 in.
Rocker arm shaft
0.0.
Factory spec.
11.973 to 11.984 mm
0.47138 to 0.47181 in.
Rocker arm 1.0. Factory spec.
12.000 to 12.018 mm
0.47244 to 0.47315 in.
00000510101
1-835