Checking Free Length Of Valve Spring; Checking Valve Spring Squareness; Checking Valve Spring Tension - Kubota D1102-B Workshop Manual

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(A) How to measure squareness of the valve spring
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Checking Free Length of Valve Spring

1) Measu re the spring with a set of vern ier cal i pers.
2) I f the measu rement exceeds the allowa ble l i m i t, replace
the val ve spring.
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t1)

Checking Valve Spring Squareness

1) Pu t the spring on a su rface plate, place a square on the
side of the spri ng, and check to see if the enti re side is
i n contact wi th the squ are.
2) Rotate the spring a nd measu re the maxi mu m B.
3) The flat su rface at the end of the spri ng coi l m ust exce·
ed two-th i rds of the f u ll ci rcu mference.
4) Check al l the su rface of the spring for scratches.
5) I f the measu rement exceeds the al l owa ble l i m i t, repl ace
the val ve spring.
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fj)

Checking Valve Spring Tension

1) Pl ace the spri ng on a tester, com press i t to the level to
wh ich the spri ng is actual l y compressed i n the engi ne.
2) R ead the com pression l oad on the gauge.
3) If the measurement exceeds the a llowa ble l i m it, replace
the va l ve spr i ng.
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52
41.7 to 42.2 mm
1.6417 to 1.6614
--
41.2 mm
1.6220 in.
Reference value
1.0 mm
0.0394 in.
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117.7 N./35.15 mm
12 kgf./35.15 mm
26.5 lb./1.3839 in.
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100.0 N./35.15 mm
10.2 kgf./35.15 mm
22.5 lb./1.3839 in.
KiSC issued 09, 2007 A