Kubota B2910 User Manual

1 ENGINE
82410 • 82710 • 82910 WSM, 12271
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Correcting Valve and Valve Seat
• NOTE
•
Before correcting the valve and seat, check the valve stem
and the 1.0. of the valve guide section, and repair them if
necessary.
•
After correcting the valve seat, be sure to check the valve
recessing.
1)
Correcting Valve
1. Correct the valve with a valve refacer.
2)
Correcting Valve Seat
1. Slightly correct the seat surface with a 1.047 rad. (60°) (intake
valve) or 0.785 rad. (45°) (exhaust valve) seat cutter (Code
No.
07909-33102).
2. Resurface the seat surface with a 0.523 rad. (30°) valve seat
cutter to intake valve seat and with a 0.262 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.
0.785 rad.
(45°) or
1.047 rad.
114--~--'- (60°)
0.262 rad.
(15°) or
0.523 rad.
(30°)
A B
~p
0.523 rad
(30°) or
0.262 rad
(15°)
(a) Identical Dimensions
(b) Valve Seat Width
(A) Check Contact
(B) Correct Seat Width
(C) Check Contact
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Valve Lapping
1. Apply compound evenly to the valve lapping surface.
2. Insert the valve into the valve guide. Lap the valve onto its seat
with a valve flapper or screwdriver.
3. After lapping the valve, wash the compound away and apply oil,
then repeat valve lapping with oil.
4. Apply prussian blue to the contact surface to check the seated
rate. If it
is less than 70 0/0, repeat valve lapping again.
• IMPORTANT
• When
valve lapping is performed, be sure to check the valve
recessing and adjust the valve clearance after assembling
the valve.
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Kubota B2910 Specifications

General

Brand	Kubota
Model	B2910
Category	Tractor
Language	English