Remove/install crankshaft

AR03.20-P-4351SR

Remove/install crankshaft

06.03.2020

Engine

281 in model 453

Modification notes

14.03.2019

Allocate new bearing shells.

Operation step 15

1

Crankshaft

2

Crankshaft bearing cap

3

Flywheel

4

Radial shaft sealing ring

2

Crankshaft bearing cap

6

Bearing shell

8

Bearing shell

5

Crankcase

7

Thrust plate

 Caution

Risk of injury to skin and eyes due to handling of engine oil. Risk of poisoning caused by swallowing engine oil

Wear protective gloves, protective clothing and safety glasses.
Do not fill engine oil into beverage containers.

AS18.00-Z-0001-01A

 Caution

Risk of injury caused by scraping or cutting body parts on sharp vehicle parts

Always wear protective gloves when working on or near sharp and non-deburred vehicle parts.
Deburr repair panels.

AS00.00-Z-0017-01A

Topical note

Notes on avoiding damage through contamination and foreign objects

AH00.00-P-5000-01A



Remove

1

Remove pistons with connecting rod.

AR03.10-P-7021SR

 The connecting rods remain on the pistons.

2

Remove rear radial shaft sealing ring (4).

AR03.20-P-3063SR

3

Mark crankshaft bearing caps (2) relative to crankcase (5).


Do not mix up crankshaft bearing caps (2).
Engine damage can occur otherwise.

4

Loosen screws of the crankshaft bearing cap (2) in reverse order of the tightening procedure and remove.

AR03.20-P-4351-02SR

5

Remove crankshaft bearing caps (2).

 Carefully pry out crankshaft bearing caps (2).

6

Mark bearing shells (8) relative to the respective crankshaft bearing caps (2).

Only when reusing the bearing shells (8).

7

Remove bearing shells (8) from the respective crankshaft bearing caps (2).

8

Remove crankshaft (1) from the crankcase (5).

9

Mark bearing shells (6) relative to the crankcase (5).

Only when reusing the bearing shells (6).

10

Mark thrust plates (7) relative to the crankcase (5).

Only when reusing the thrust plates (7).

11

Remove bearing shells (6) and thrust plates (7) from the crankcase (5).



Clean

12

Clean all parts of the crank assembly.


The parts of the crank assembly must be absolutely free of soiling.
Engine damage will occur otherwise.

Assembly cleaner

*BR00.45-Z-1028-04A



Check

13

Check bearing shells (6, 8), thrust plates (7), and the crankshaft bearing journals for wear and damage.

Information on assessing wear of main bearings and main bearing journals

AH03.20-P-1000-02MM

If there is a problem,



Replace corresponding bearing shells (6, 8), thrust plates (7), or crankshaft (1).

14

Check remaining power unit components for wear and damage.

If there is a problem,



Replace corresponding power unit components.



Install

15

Allocate new bearing shells (6, 8).

Only when installing new bearing shells (6, 8).

AR03.20-P-4360-01SR

16

Wet bearing shells (6) and thrust plates (7) with engine oil.



Specified engine oils (service) - Overview

BB00.40-P-0223-02A

17.1

Insert new bearing shells (6) and new thrust plates (7) in the crankcase (5).

Only when installing new bearing shells (6) and thrust plates (7).

 The grooves (arrows) for the thrust plates (7) are attached single-sidedly and must be visible after insertion.

17.2

Insert previously marked bearing shells (6) and previously marked thrust plates (7) at the respectively marked location in the crankcase (5).

Only when reusing the bearing shells (6) and thrust plates (7).

 The grooves (arrows) for the thrust plates (7) are attached single-sidedly and must be visible after insertion.

18

Wet crankshaft bearing journals and connecting rod journals with engine oil.



Specified engine oils (service) - Overview

BB00.40-P-0223-02A

19

Position crankshaft (1) in the crankcase (5) and position.

20

Wet bearing shells (8) with engine oil.



Specified engine oils (service) - Overview

BB00.40-P-0223-02A

21.1

Insert new bearing shells (8) in the crankshaft bearing caps (2).

Only when installing new bearing shells (8).

21.2

Insert previously marked bearing shells (8) in the respectively marked crankshaft bearing caps (2).

Only when reusing the bearing shells (8).

22

Install crankshaft bearing caps (2) at the respective marked location in the crankcase (5).


Install crankshaft bearing caps (2) at the same location and in the same direction as before.
Engine damage can occur otherwise.

23

Wet bolt heads of the screws of the crankshaft bearing caps (2) with engine oil.



Specified engine oils (service) - Overview

BB00.40-P-0223-02A

24

Screw in screws of the crankshaft bearing caps (2).

Tightening procedure for crankshaft bearing caps

AR03.20-P-4351-02SR

Topical note

Notes on threaded connections fastened using a tightening angle-based tightening process

AH00.00-P-0020-01A


Observe tightening procedure.
Engine damage can occur otherwise.

 Bolt for crankshaft bearing cap

*BA03.20-P-1001-01G

25

Install rear radial shaft sealing ring (4).

AR03.20-P-3063SR

26

Install pistons with connecting rod.

AR03.10-P-7021SR

 Crankshaft bearing cap

Number

Designation

Engine 281

BA03.20-P-1001-01G

Bolt for crankshaft bearing cap

Stage 1

Nm

32

Stage 2

°

62

Repair materials

Number

Designation

Order number

BR00.45-Z-1028-04A

Assembly cleaner

A 000 986 56 01