Kubota WG972-E2 Workshop Manual page 118

WG972-E2, DF972-E2, WSM
Main Bearing Case Assembly
1. Remove the two main bearing case screws 1 (4), and remove the
main bearing case assembly 1 (1), being careful with crankshaft
bearing 3 (5) (9).
2. Remove the main bearing case assembly 2 (2) and the main
bearing case assembly (3) as above. Keep in mind, however,
that the thrust bearing (8) is installed in the main bearing case
assembly (3).
(When reassembling)
• Clean the oil passage in the main bearing cases.
• Apply clean engine oil to the bearings.
• Install the main bearing case assemblies in original positions.
Since diameters of main bearing cases vary, install them in order
of marking (b) from the gear case side. (Refer to the figure.).
• Be careful not to confuse the top and bottom of the crankshaft
bearing 3 (5) (9). (Install the bearing with the oil groove (c) up.)
• Match the alignment numbers (a) on the main bearing case
assembly 1.
• Do the same for the main bearing case assembly 2 (2) and the
main bearing case assembly (3) too.
• When installing the main bearing case 1 and 2, face the mark
"FLYWHEEL" to the flywheel.
• Install the thrust bearing (8) 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.
Tightening torque Main bearing case screw 1
(1) Main Bearing Case Assembly 1
(2) Main Bearing Case Assembly 2
(3) Main Bearing Case Assembly
(4) Main Bearing Case Screw 1
(5) Crankshaft Bearing 3
(Upper, with Oil Groove)
(6) Crankshaft Bearing 2
(Upper, with Oil Groove)
(7) Crankshaft Bearing 2 (Lower)
(8) Thrust Bearing
(9) Crankshaft Bearing 3 (Lower)
S-48
GASOLINE / LPG ENGINE
12.7 to 15.7 N·m
1.3 to 1.6 kgf·m
9.4 to 11.6 ft-lbs
(a) Alignment Number
(b) Marking (1 or 2)
(c) Oil Groove
W1034602
KiSC issued 01, 2006 A