Man D2862 LE221, Repair Manual

Page: 348 / 420

CRANK MECHANISM
Checking the main bearing journal
• Clean the main bearing journal of the
crankshaft (1)
• Measure the main bearing journal of the
crankshaft (1) using a micrometer (2)
• Repeat the measurement for each main bearing
journal
The dimensions of the crankshaft bearing journals
must be within the specied tolerances,
Ø 111.966
– 111.988 mm .
Fit a new crankshaft if the dimensions are out of
tolerance
Checking the connecting rod bearing journal
• Clean the crankshaft (1)
• Measure the connecting rod bearing journal using
a micrometer (2)
• Measure the connecting rod bearing journal at
several points
• Repeat the measurement for each connecting rod
bearing journal
• The permitted connecting rod bearing journal
diameter is Ø 95.966 – 95.988 mm
Fit a new crankshaft if the dimensions are out of
tolerance
Installing the crankshaft
Inserting the main bearing shells into the
crankcase lower section
• Check none of the tted sleeves (2) are missing;
10 items, V 12 engine has 14 items
• Thinly apply clean engine oil to MAN Standard
3277 on the main bearing shells (1)
• Insert the main bearing shells (1) into the bearing
seats as marked and align with the Setting
tool [149]
Inserting the main bearing shells into the
crankcase
Note
Only use thrust washers with the same
wall thickness.
• Insert the cleaned main bearing shells (1) into the
bearing seats on the crankcase as marked and
align with the
Setting tool [149]
• Lightly apply clean engine oil to MAN Standard
3277 on the main bearing shells (1)
• Determine the thrust washers (2) to be used, see
Checking the crankshaft axial play, 340
• Thinly apply clean engine oil to MAN Standard
3277 on the cleaned thrust washers (2)
• Insert the thrust washers (2) into the nal bearing
seat as marked, with the oil grooves facing the
crankshaft
346 AE6 3st edition