wsm wg972-e4 - Page 128

ENGINE
WG972-E4, WSM
1-S37
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.
• Make sure that the main bearing case moves smoothly after
tightening the main bearing case screw 1 to the specified
torque.
9Y1211108ENS0059US0
Tightening torque Main bearing case screw 1
13 to 15 N·m
1.3 to 1.6 kgf·m
9.4 to 11 lbf·ft
(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)
(a) Alignment Number
(b) Marking (1 or 2)
(c) Oil Groove
KiSC issued 07, 2015 A