PROCEDURE
1 Prepare the bearing shell before removal.
1.1 Operate the turning gear to turn the crank to the exhaust side approximately 90°
after TDC.
1.2 Lock the turning gear to prevent movement.
2 Install the hydraulic rams.
2.1 Put the bracket (003, Figure 6-10) on the main bearing girder as shown.
2.2 Put the two hydraulic rams (001) on the bracket (003) as shown.
2.3 Put the steel beam (004) in position as shown below the flywheel (005).
2.4 Put the other hydraulic ram (001) on the beam (004).
2.5 Put the steel plate on top of the hydraulic ram (001).
2.6 Connect the hydraulic rams (001) to the HP oil pump.
2.7 Put the dial gauge (006) in position on the crankshaft (007) in the vertical axis.
3 Lift the crankshaft.
3.1 Record the values of the lateral clearances (y1 and y2) between the crankshaft
(007) and the main bearing shell (008) at approximately 50 mm below the
bearing.
3.2 Set to zero the dial gauge (006).
3.3 Operate the HP oil pump to lift the crankshaft (007) to 0.3 mm.
3.4 Make sure that the value on the dial gauge (006) is 0.3 mm.
3.5 Make sure that there is no clearance between the adjacent bearing cover and
the crankshaft (007).
3.6 Keep the pressure constant.
3.7 Measure the lateral bearing clearances y1 and y2. Compare these values with
the values recorded in Step 3.1.
3.8 If the value of the lateral bearing clearance is more than 0.1 mm, lower the
crankshaft and do as follows:
3.8.1 Install the hydraulic rams (001) in position where the lateral bearing
clearance is smaller.
3.8.2 Operate the HP oil pump.
3.8.3 Lift the crankshaft (007) to 0.3 mm.
X72DF
AA00-1134-00AAA-520A-A
Maintenance Manual Main bearing shell - remove
Winterthur Gas & Diesel Ltd.
- 118 - Issue 002 2020-10
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