Kubota ,RCK60B-23BX, Руководство по ремонту

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6.1.8 Correcting valve
NOTE
• Before correcting the valve and seat, check the
valve stem and the I.D. of valve guide section,
and repair them if necessary.
1. Correct the valve with a valve refacer.
BX1880 and BX2380
Valve face angle
Factory specifica-
tion 0.79 rad
45°
BX2680
Valve face an-
gle Factory speci-
fication
IN.
1.0 rad
60°
EX.
0.79 rad
45°
6.1.9 Correcting valve seat
NOTE
• Before correcting the valve and seat, check the
valve stem and the I.D. of valve guide section,
and repair them if necessary.
(1) Valve seat width
(2) Identical dimensions
(A) Check contact
(B) Correct seat width
(C) Check contact
(a) 0.26 rad (15°) or 0.52 rad
(30°)
(b) 0.79 rad (45°) or 1.0 rad
(60°)
(c) 0.52 rad (30°) or 0.26 rad
(15°)
1. Slightly correct the seat surface with a 1.0 rad (60°)
(intake valve) or 0.79 rad (45°) (exhaust valve)
valve seat cutter.
BX1880 and BX2380
Valve seat angle
Factory specifi-
cation 0.79 rad
45°
BX2680
Valve seat an-
gle Factory speci-
fication
IN.
1.0 rad
60°
EX.
0.79 rad
45°
2. Resurface the seat surface with a 0.52 rad (30°)
valve seat cutter to intake valve seat and with a
0.26 rad (15°) valve seat cutter to exhaust valve
seat so that the width is close to specified valve
seat width (2.12 mm, 0.0835 in.).
3. After resurfacing the seat, inspect for even valve
seating, apply a thin film of compound between the
valve face and valve seat, and fit them with valve
lapping tool.
4. Check the valve seating with prussian blue.
The valve seating surface should show good
contact all the way around.
NOTE
• After correcting the valve seat, be sure to check
the valve recessing.
SERVICING
6. Servicing 3. ENGINE
BX1880,BX2380,BX2680,RCK60B-23BX,RCK54-23BX,RCK48-18BX,RCK60D-26BX,RCK54D-26BX
3-59
KiSC issued 03, 2019 A