Main Bearing Case Assembly; Cylinder Head Surface Flatness - Kubota B2410 Workshop Manual

82410 • 82710 • 82910 WSM, 12271
11790F10530
SERVICING
(1) Cylinder Head and Valves
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1 ENGINE
Main Bearing Case Assembly
1. Remove the two main bearing case screws 1, and remove the
main bearing case assembly, being careful with the thrust
bearing and crankshaft bearing 2.
2. Remove the main bearing case assembly 1, 2 and 3 as above.
(When reassembling)
• Clean the oil passage in the main bearing case.
• Apply clean engine oil on the bearings.
• Install the main bearing case assemblies in the original positions.
Since diameters of main bearing case vary, install them in order
of makings
[A,
B, C] from the gear case side.
• Match the alignment numbers (1) on the main bearing case.
• When installing the main bearing case 1, 2, and 3, face the mark
"FLYWHEEL" to the flywheel.
• Install the thrust bearing with its oil groove facing outward.
• Confirm that the main bearing case moves smoothly after
tightening the main bearing case screw 1 to the specified torque.
29.4 to 34.3 N·m
Tightening torque Main bearing case screw 1 3.0 to 3.5 kgf·m
21.7 to 25.3 ft-Ibs
(1)
Alignment Number
12270810400
Cylinder Head Surface Flatness
1. Clean the cylinder head surface.
2. Place a straightedge on the cylinder head's four sides and two
diagonal as shown in the figure.
3. Measure the clearance with a feeler gauge.
4. If the measurement exceeds the allowable limit, correct it with a
surface grinder.
• IMPORTANT
• Do not place the straightedge on the combustion chamber.
• Be sure to check the valve recessing after correcting.
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Cylinder head surface
flatness
1-S31
Allowable limit
0.05 mm
0.0019 in.
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