ar0320b4355dd

Measure crankshaft and remount in bearings

Type ar · topic 03.20 · version 0101 · 2020-03-13

Applies to: Engine 906.999 Engine 924.92 Engine 926.942 in model 382.171/176 Engine 926.95

Where it sits

Function group 1 Engine › 03 Crank assembly › 03.20 Crankshaft — Series 382 (models 171, 176) · Series 906 (models 999)

EinPAS 15 Engine › 15.15 Combustion engine, complete/engine housing/crank assembly › 15.15.41 Crankshaft/flywheel/drive plate — Series 382 (models 171, 176) · Series 906 (models 999)

Also applies to engines/gearboxes: 924 92*, 926 942, 926 95*

AR03.20-B-4355DD

Measure crankshaft and remount in bearings

28.02.2020

Engine

906.999

Engine

924.92

Engine

926.942 in model 382.171/176

Engine

926.95

Measure crankshaft and remount in bearings

W03.20-0042-09

1

Crankshaft

A

Diameter of the primary bearing neck.

E

Primary bearing neck width

2

Hardness meter

B

Adjustment bearing neck width

F

Fillet radius on the primary and connecting rod necks

3

External micrometer

C

Primary bearing neck width

G

Convexity on the primary and connecting rod necks

4

Main bearing cap

D

Connecting rod neck diameter.

H

Inner diameter of the primary bearing.

5

Main bearing cap bolt

Measure crankshaft and remount in bearings

1

Crankshaft

7

Dial indicator

8

Dial indicator holder

W03.20-0043-05

Inspect

1

Remove the crankshaft (1)

AR03.20-B-4351DD

2

Clean the engine parts

AR01.40-B-8501DD

3

Clean the crankshaft (1)

4

Check the crankshaft front flange wear

In the event of wear, a radial retainer with track is available for repair.

5

Inspect main and connecting rod necks for damage and cracks

Information on assessing wear of main bearings and main bearing journals

AH03.20-B-1000-02A

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

AH03.10-B-0001-03A

In the case of wear or cracks:

Replace the crankshaft (1).

6

Test the hardness of the main bearing necks and connecting rods with a hardness tester (2)

Provide support for the main or connecting rod being tested. The surfaces must have the specified hardness over at least two thirds of the circumference of the main neck or connecting rod.

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

*BE03.20-B-1006-02C

Hardness tester

*000589202100

7

Measure crankshaft concentricity deviation (1)

Measured on the central main neck, supported by the external main necks.

Crankshaft run-out (crankshaft mounted on the end journals)

*BE03.20-B-1010-02C

Dial gage

*001589532100

Dial indicator holder

*363589022100

8

Measure the primary bearing and the connecting rod neck

Diameter of the main journals

*BE03.20-B-1001-02C

Width

*BE03.20-B-1002-02C

Diameter of connecting rod journal on crankshaft

*BE03.20-B-1003-02C

Compensating washers thickness

*BE03.20-B-1008-02C

Basic bore diameter of main bearings (bearing shell housing)

*BE03.20-B-1009-02C

Connecting rod bearing journal width

*BE03.20-B-1011-02C

Fillet radius on journals

*BE03.20-B-1012-02C

Buckle on main and connecting rod journals

*BE03.20-B-1013-02C

Maximum out-of-round and taper on main and connecting rod journals

*BE03.20-B-1015-02C

Permitting lateral knocking

*BE03.20-B-1020-02C

.Crankshaft permitted unbalance (with the flywheel fastening pin, however, without the flywheel), fastened to the two and six main bearings

*BE03.20-B-1023-02C

If damage and wear is found:

Crankshaft permitted unbalance (with the flywheel fastening pin, however, without the flywheel), fastened to the main outer bearings

*BE03.20-B-1022-02C

9

Radial assembly on the crankshaft (1)

AR03.20-B-4355-01DD

Diameter of the main journals

*BE03.20-B-1001-02C

Inside diameter of main journal bearing shells (installed)

*BE03.20-B-1007-02C

Main bearing cap bolts to engine block

*BA01.40-B-1001-01B

Dial gage

*001589532100

10

Install the crankshaft (1)

AR03.20-B-4351DD

Crankshaft test values

Number

Designation

Engine 906.9; 926.9; 924.9

BE03.20-B-1001-02C

Diameter of the main journals

standard

mm

85,990...86,010

standard I

mm

85,890...85,910

repair stage I

mm

85,740...85,760

repair stage II

mm

85,490...85,510

repair stage III

mm

85,240...85,260

repair stage IV

mm

84,990...85,010

Crankshaft test values

Number

Designation

Engine 906.9; 926.9; 924.9

BE03.20-B-1002-02C

Width

of main thrust bearing

standard

mm

31,000...31,100

repair stage I

mm

31,300...31,400

repair stage II

mm

31,500...31,600

of the other main journals

mm

31,0...31,2

Crankshaft test values

Number

Designation

Engine 906.9; 926.9; 924.9

BE03.20-B-1003-02C

Diameter of connecting rod journal on crankshaft

standard

mm

69,995...70,015

standard I

mm

69,895...69,915

repair stage I

mm

69,745...69,765

repair stage II

mm

69,495...69,515

repair stage III

mm

69,245...69,265

repair stage IV

mm

68,995...69,015

Crankshaft test values

Number

Designation

Engine 906.9; 926.9; 924.9

BE03.20-B-1006-02C

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

minimum

HRC

52

Crankshaft test values

Number

Designation

Engine 906.9; 926.9; 924.9

BE03.20-B-1007-02C

Inside diameter of main journal bearing shells (installed)

standard

mm

86,066...86,108

standard I

mm

85,966...86,008

repair stage I

mm

85,816...85,858

repair stage II

mm

85,566...85,608

repair stage III

mm

85,316...85,358

repair stage IV

mm

85,066...85,108

Crankshaft test values

Number

Designation

Engine 906.9; 926.9; 924.9

BE03.20-B-1008-02C

Compensating washers thickness

standard

mm

3,240...3,310

repair stage I

mm

3,390...3,460

repair stage II

mm

3,490...3,560

Crankshaft test values

Number

Designation

Engine 906.9; 926.9; 924.9

BE03.20-B-1009-02C

Basic bore diameter of main bearings (bearing shell housing)

mm

91,000...91,022

Crankshaft test values

Number

Designation

Engine 906.9; 926.9; 924.9

BE03.20-B-1010-02C

Crankshaft run-out (crankshaft mounted on the end journals)

Maximum

mm

0,15

Crankshaft test values

Number

Designation

Engine 906.9; 926.9; 924.9

BE03.20-B-1011-02C

Connecting rod bearing journal width

standard

mm

34,0...34,2

repair

mm

-

Crankshaft test values

Number

Designation

Engine 906.9; 926.9; 924.9

BE03.20-B-1012-02C

Fillet radius on journals

main

mm

2,5...3,0

connecting rod

mm

2,5...3,0

Crankshaft test values

Number

Designation

Engine 906.9; 926.9; 924.9

BE03.20-B-1013-02C

Buckle on main and connecting rod journals

mm

0...0,004

Crankshaft test values

Number

Designation

Engine 906.9; 926.9; 924.9

BE03.20-B-1015-02C

Maximum out-of-round and taper on main and connecting rod journals

limit for reutilization

mm

0,02

new or machined crankshaft

mm

0,005

Crankshaft test values

Number

Designation

Engine 906.9; 926.9; 924.9

BE03.20-B-1020-02C

Permitting lateral knocking

Bearing pin

mm

0,015

Crankshaft test values

Number

Designation

Engine 906.9; 926.9; 924.9

BE03.20-B-1022-02C

Crankshaft permitted unbalance (with the flywheel fastening pin, however, without the flywheel), fastened to the main outer bearings

gmc

-

Crankshaft test values

Number

Designation

Engine 906.9; 926.9; 924.9

BE03.20-B-1023-02C

Crankshaft permitted unbalance (with the flywheel fastening pin, however, without the flywheel), fastened to the two and six main bearings

gmc

30

Engine block, fuel rail housing cover, cover

Number

Designation

Engine 904.9, 906.9

Engine 924.9, 926.9

BA01.40-B-1001-01B

Main bearing cap bolts to engine block

1st stage

Nm

30

30

2nd stage

Nm

80

80

3rd stage

Nm

155

155

4th stage

Graus

90°

90°

Measure crankshaft and remount in bearings
Measure crankshaft and remount in bearings
Measure crankshaft and remount in bearings

000 589 20 21 00

Hardness tester

001 589 53 21 00

Dial gage

363 589 02 21 00

Dial indicator holder

Referenced documents