Inspecting crankshaft

AR03.20-T-4463A

Inspecting crankshaft

2.4.98



Removing

1

Remove crankshaft

AR03.20-T-4351A



Disassembling

2

Disassemble crankshaft

AR03.20-T-4348A



Inspecting

3

Inspect crankshaft for cracks

Inspect with a crack inspection machine.

 Replace crankshaft if necessary.

4

Inspect hardness of bearing journals

Inspect with hardness tester (1).

 Replace crankshaft if necessary.

Hardness of bearing journals

*BE03.20-N-1007-02F



*000589202100

5

Inspect crankshaft for radial and axial runout

Use

- a dial gage (2), and

- dial gage holder (3).

 If necessary, straighten crankshaft using a crankshaft straightening press.

When straightening, ensure that the crankshaft is mounted at the first seventh bearing journals and pressure is applied only at the fourth bearing journal (fit bearing).



*001589532100



*363589022100

 Permissible radial runout of fit bearing when mounted in outer crankshaft bearing journals.

*BE03.20-N-1005-02F

6

Inspect bearing journals of conrod and crankshaft bearings for scores and dimensional tolerance

 Determine repair size if necessary.



*001589532100



*363589022100

Diameter of crankshaft bearing journal

*BE03.20-N-1001-02F

Diameter of conrod bearing journal

*BE03.20-N-1002-02F

7

Inspect centering hole (4)

 Rework centering hole if necessary.



Assembling

8

Assemble crankshaft

AR03.20-T-4348A



Inspecting

9

Inspect imbalance of crankshaft

 Inspection of imbalance of crankshaft on crankshaft balancing machine. Mount crankshaft at first and seventh bearing journals for this step.

Permissible imbalance (without flywheel / ring gear carrier)

*BE03.20-N-1006-02F

If measurement of imbalance is greater than permissible maximum: 

Balance crankshaft



Installing

10

Install crankshaft

AR03.20-T-4351A

Number

Designation

Engine 447

Engine 489

BE03.20-N-1001-02F

Diameter of crankshaft bearing journal

Standard

mm

104.002

104.002

Standard I

mm

103.88 – 103.90

103.88 – 103.90

Repair size I

mm

103.73 – 103.75

103.73 – 103.75

Repair size II

mm

103.48 – 103.50

103.48 – 103.50

Repair size III

mm

102.98 – 103.00

102.98 – 103.00

BE03.20-N-1002-02F

Diameter of conrod bearing journal

Standard

mm

89.98 – 90.00

89.98 – 90.00

Standard I

mm

89.88 – 89.90

89.88 – 89.90

Repair size I

mm

89.75 – 89.77

89.75 – 89.77

Repair size II

mm

89.48 – 89.50

89.48 – 89.50

Repair size III

mm

89.98 – 89.00

89.98 – 89.00

BE03.20-N-1005-02F

Permissible radial runout of fit bearing when mounted in outer crankshaft journals

mm

0.09

0.09

BE03.20-N-1006-02F

Permissible imbalance (without flywheel / ring gear carrier)

g/cm

60

60

BE03.20-N-1007-02F

Hardness of bearing journals

RHC

54 – 60

54 – 60