Measure crankshaft and remount in bearings

AR03.20-I-4355B

Measure crankshaft and remount in bearings

12.12.08



Removing

1

Remove crankshaft (1)

AR03.20-I-4351B



Clean

2

Clean crankshaft (1)

Checking

3

Check running surface on the crankshaft (1) for the front radial sealing ring for score marks or galling

 If wear is present, a new radial sealing ring with race is available for repairs.

4

Perform visual inspection of main bearing journal



Information on assessing wear of main bearings and main bearing journals

AH03.20-N-1000-02A

 In case of damage, tears or significantly visible and perceptible score marks:



Machine main bearing journal of crankshaft (1) or replace crankshaft (1).

5

Perform visual inspection of connecting rod journal



Notes on assessing wear on connecting rod bearings and connecting rod bearing journals

AH03.10-N-0001-03A

 In case of damage, tears or significantly visible and perceptible score marks:



Machine connecting rod journal of crankshaft (1) or replace crankshaft (1).

6

Inspect hardness of main and connecting rod bearing journals with drop hardness tester (2)

 Provide support for the main or connecting rod journal being tested. The surfaces should display the specified harness over at least two thirds of the circumference of the main bearing and connecting rod journal.

*BE03.20-N-1013-02B



*000589202100



Notes on hardness test

AH00.00-N-0012-01A

If the specified harness readings are not reached : 

Reharden or replace crankshaft (1).



Measure

7

Measure deviation from concentricity of the crankshaft (1) at the middle main bearing journal

 To do this lay both outer main bearing journals of the crankshaft (1) on crankshaft prisms for example.

*BE03.20-N-1011-02B



*001589532100



*363589022100

8

Measure all main bearing and connecting rod journals

Outside diameter of
main bearing journal (A)

*BE03.20-N-1001-02B

Width of fitted bearing journal (B)

*BE03.20-N-1002-02B

Width of main bearing journal (C)

*BE03.20-N-1003-02B

Outside diameter of
connecting rod journal (D)

*BE03.20-N-1004-02B

Width of connecting rod journal (E)

*BE03.20-N-1005-02B

Fillet radius of
main bearing journal (F) and connecting rod journal

*BE03.20-N-1012-02B

Spherical shape of piston ring of main bearing journal (G) and connecting rod journal

*BE03.20-N-1014-02B

Permissible deviation from out-of-roundness at the main bearing and connecting rod journal

*BE03.20-N-1008-02B

Permissible conicity at main bearing journal and at connecting rod bearing journal

*BE03.20-N-1009-02B

Permissible lateral runout at fitted bearing journal

*BE03.20-N-1010-02B

Maximum approved deviation from perfect crankshaft balance (with flywheel mounting stud, but without flywheel) at the front and rear main bearings.

*BE03.20-N-1019-02B

Mounting

9

Mount crankshaft (1) radially in bearings

AR03.20-W-4355-01B

Outside diameter of
main bearing journal (A)

*BE03.20-N-1001-02B

Inside diameter of main bearing (H)

*BE03.20-N-1015-02B



*BA01.40-N-1001-01C



Install

10

Install crankshaft (1)

AR03.20-I-4351B

Number

Designation

Engine
900.9

BE03.20-N-1001-02B

Main bearing journal Ø

Default

mm

85.990...86.010

Deviation -0.1

mm

85.890...85.910

Deviation -0.25

mm

85.740...85.760

Deviation -0.5

mm

85.490...85.510

Deviation -0.75

mm

85.240...85.260

Deviation -1.0

mm

84.990...85.010

BE03.20-N-1002-02B

Fitted bearing journal width

Standard Ø

mm

85.990...86.010

Standard width

mm

31.000...31.062

Ø deviation -0.1

mm

85.890...85.910

Standard width

mm

31.000...31.062

Ø deviation -0.1

mm

85.890...85.910

Width deviation 0.3

mm

31.300...31.362

Ø deviation -0.25

mm

85.740...85.760

Width deviation 0.3

mm

31.300...31.362

Ø deviation -0.5

mm

85.490...85.510

Width deviation 0.5

mm

31.500...31.562

Dia. deviation -0.75

mm

85.240...85.260

Width deviation 0.5

mm

31.500...31.562

Ø deviation -1.0

mm

84.990...85.010

Width deviation 0.5

mm

31.500...31.562

BE03.20-N-1003-02B

Main bearing journal width

mm

31.0...31.2

BE03.20-N-1004-02B

Connecting rod bearing journal Ø

Default

mm

69.995...70.015

Deviation -0.1

mm

69.895...69.915

Deviation -0.25

mm

69.745 ...69.765

Deviation -0.5

mm

69.495...69.515

Deviation -0.75

mm

69.245...69.265

Deviation -1.0

mm

68.995...69.015

BE03.20-N-1005-02B

Connecting rod bearing journal width

mm

34.0...34.2

BE03.20-N-1008-02B

Main and connecting rod bearing journals permissible out-of-roundness variation

Limit value

mm

0.005

BE03.20-N-1009-02B

Permissible taper

Main bearing journals

mm

0.005

Connecting rod bearing journals

mm

0.005

BE03.20-N-1010-02B

Permissible lateral runout

Fit bearing journal

mm

0,20

BE03.20-N-1011-02B

Variation in concentricity measured at middle main bearing journal (mounted at outer main bearing journals)

mm

0.11

BE03.20-N-1012-02B

Fillet radii

Main bearing journals

mm

2.5...3.0

Connecting rod bearing journals

mm

2.5...3.0

BE03.20-N-1013-02B

Hardness of main bearing and connecting rod bearing journals (Rockwell hardness)

HRC

52

BE03.20-N-1014-02B

Spherical shape

Main bearing journals

mm

0.000...0.004

Connecting rod bearing journals

mm

0.000...0.004

BE03.20-N-1015-02B

Main bearing inside Ø

Default

mm

86.066...86.108

Deviation 0.1

mm

85.966...86.008

Deviation 0.25

mm

85.816...85.858

Deviation 0.5

mm

85.566...85.608

Deviation 0.75

mm

85.316...85.358

Deviation 1.0

mm

85.066...85.108

BE03.20-N-1019-02B

Maximum approved deviation from perfect crankshaft balance (with flywheel mounting stud, but without flywheel) at the front and rear main bearings.

gcm

30

Number

Designation

Engines 900.9, 902.9, 904.9, 906.9

BA01.40-N-1001-01C

Bolt from main bearing cap to crankcase

Stage 1

Nm

30

Stage 2

Nm

80

Stage 3

Nm

155

Stage 4

°

90