wsm B2420 - Thermostat and Water Pump

ENGINE
B2420, WSM
1-S38
Crankshaft Assembly
1. Remove the main bearing case screw 2 (1).
2. Pull out the crankshaft assembly.
IMPORTANT
• Take care to protect crankshaft bearing 1 from scratches,
caused by the crank gear, etc.. (Wrap the crank gear in vinyl
tape, etc..)
(When reassembling)
• Clean the oil passage of the crankshaft with compressed air.
• Apply oil to the main bearing case screw 2 (1).
• Install the crankshaft assembly, aligning the screw hole of main
bearing case with the screw hole of crankcase.
9Y1210436ENS0055US0
Main Bearing Case Assembly
1. Remove the two main bearing case screws 1 (5) and remove
the main bearing case assembly (4), being careful with thrust
bearing (3) and crankshaft bearing 2.
2. Remove the main bearing case assembly 1 (1) and 2 (2) as
above.
(When reassembling)
• Clean the oil passage in the main bearing cases.
• Apply clean engine oil on the bearings.
• Install the main bearing case assemblies in the original
positions. Since diameters of main bearing cases vary, install
them in order of makings (1), (2) from the gear case side.
• Match the alignment numbers (6) on the main bearing case.
• When installing the main bearing case 1 and 2, 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.
9Y1210436ENS0056US0
(5) Thermostat and Water Pump
Thermostat Assembly
1. Remove the thermostat cover mounting screws, and remove
the thermostat cover (1).
2. Remove the thermostat assembly (3).
(When reassembling)
• Apply a liquid gasket (Three Bond 1215 or equivalent) only at
the thermostat cover side of the gasket (2).
9Y1210436ENS0057US0
Tightening torque Main bearing case screw 2
49 to 53 N·m
5.0 to 5.5 kgf·m
37 to 39 lbf·ft
(1) Main Bearing Case Screw 2
Tightening torque Main bearing case screw 2
30 to 34 N·m
3.0 to 3.5 kgf·m
22 to 25 lbf·ft
(1) Main Bearing Case Assembly 1
(2) Main Bearing Case Assembly 2
(3) Thrust Bearing
(4) Main Bearing Case Assembly
(5) Main Bearing Case Screw 1
(6) Alignment Number
(1) Thermostat Cover
(2) Thermostat Cover Gasket
(3) Thermostat Assembly
KiSC issued 06, 2012 A