Kubota D650-B Handbuch Seite 152

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Checking Valve Spring Free Length
1) Measure the spring with a set of vernier calipers.
2) If the measurement exceeds the allowable limit, replace.
35.1 to 35,6 mm
Reference value
1.382 to 1.402 in.
34.8
mm
Allowable limit
OOllP069
1.37 mm
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Checking Valve Spring Squareness
1) Put the spring on a surface plate, place a square on the
side of the spri.ng, and check to see if the entire side is in
contact with the square.
2) Rotate the spring and measure the maximum B. (See the
illustration at left.)
3) If the measurement exceeds the allowable limit, replace.
The flat surface at the end of the spring coil must exceed
the full circumference by two-thirds.
Check the entire surface of the spring for scratches.
[AI How to measure squareness of valve
1.3mm
Allowable limit
0.051 in.
COlYF021
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Checking Valve Spring Tension
1) Place the spring on a tester and compress it to the same
degree that it is actually compressed in the engine.
(31mm, 12in.)
2) Read the compression load on the gauge.
3) If the measurement exceeds the allowable limit, replace.
GOll PO 71
Reference value
Allowable limit
74 N/31 mm
7.5 kgf/31 mm
16.5 Ibsl1.22 in.
63 N/31
6.4 kgf/31 mm
14.1 Ibs/1.22 in .
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