Replacing all crankshaft main bearing shells (S55 engine)

Special tools required: 

• 2 360 227
• 11 4 470

Necessary preliminary tasks: 

• Remove CRANKSHAFT .

Checking position of oil spray nozzles: 

Check position of oil spray nozzle (1) according to position on special tool 2 360 227.

Insert special tool 2 360 227 into main bearing screw connection and secure from turning with screw (2).

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If necessary, adjust oil spray nozzles and secure.

Tighten banjo bolt (1).

Tightening torque: 11 11 5AZ .

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Installation note: 

Bearing shell (1) with lubricating groove must be fitted in upper section of crankcase.

Bearing shell (2) without lubricating groove must be installed in lower section of crankcase.

Attention! 

Allocation of bearing positions:

Bearing position 1 is at the front on the timing chain drive in the direction of travel.

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Main bearing classification: 

Code letters D/E or F) are used for the crankcase upper section.

Bearing seat assignment from 7 to 1, the seventh bearing position is located on the clutch side and is indicated by an asterisk (K).

Bearing seat 4 is designed as guide bearing.

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Main bearing classification: 

The key performance indicators 4/5 or 6) are used for the crankcase lower section.

Bearing seat assignment from 1 to 7, the first bearing position is located at the timing chain drive of cylinder 1.

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Installation note: 

The letter/number combination produces a bearing shell pairing.

Identification by different colors.

Attention! 

First bearing position is on the timing drive.

Engine damage will result if an insufficiently small radial clearance is determined.

If a large radial clearance is determined, this can lead to noise in crankshaft drive.

Code letters on crankcase: 

Code letters D, E or F  . for bearing shell (1)

Code numbers on crankshaft: 

Code number 4, 5 or 6  . for bearing shell (2)

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Enter code letters and numbers for crankcase and crankshaft

Code letters/numbers	Bearing seat 1	Bearing seat 2	Bearing seat 3	Bearing seat 4	Bearing seat 5	Bearing seat 6	Bearing seat 7
Crankcase, top
Crankshaft, bottom

Possible color combinations

S55 B30	Main bearing classification
Crankshaft code number	Code letters on crankcase			Bearing shell position
	D	E	F
4	Blue	Brown	Brown	Upper part of crankcase
	Blue	Blue	Brown	Crankcase lower section
5	Blue	Brown	Purple	Upper part of crankcase
	Brown	Brown	Brown	Crankcase lower section
6	Brown	Brown	Purple	Upper part of crankcase
	Brown	Purple	Purple	Crankcase lower section

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Attention! 

Do not use any metal-cutting tools.

Only use special tool 11 4 470 to clean sealing surfaces.

Installation note: 

Clean all sealing surfaces.

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Install bearing shells (2) and guide bearing shell (3).

Fit CRANKCASE LOWER SECTION .

Assemble engine.