11 21 531 Replacing all crankshaft main bearing shells (N20)

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Special tools required:

Necessary preliminary tasks:

Remove CRANKSHAFT .

Checking position of oil spray nozzles:

Check position of oil spray nozzle according to position on special tool 2 212 829 .

Insert special tool 2 212 829 into main bearing screw connection and secure from turning with screw (1).

Secure oil spray nozzle with screw (2).

Tightening torque: 11 11 3AZ .

Fig 1: Checking Position Of Oil Spray Nozzles

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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.

IMPORTANT: Allocation of bearing positions: Bearing position 1 is at the front on the timing chain drive in the direction of travel.

Fig 2: Identifying Bearing Shells With/Without Lubricating Groove

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Main bearing classification:

Code letters (A, B, or C) are used for the crankcase upper section.

Code letter (K) stands for clutch side.

Same procedure, with missing code letter (K).

The bearing seat assignment is from 5 to 1, the first bearing position is at the control drive.

Fig 3: Identifying Main Bearing Classification Code Letters For Crankcase Upper Section

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Main bearing classification:

ID codes (1, 2, or 3) are used for crankcase lower section.

For bearing seat assignment (1) from 1 to 5, the first bearing position is located on timing drive.

NOTE: Code letters (2) are required exclusively for classifying CONNECTING ROD BEARING .

Fig 4: Identifying Main Bearing Classification ID Codes And Code Letters For Crankcase Lower Section

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Observe BEARING CLASSIFICATION .

Installation note:

The letter/number combination produces a bearing shell pairing.

Identification by different colors.

IMPORTANT: 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 noises in crankshaft drive.

Code letters on crankcase:

Code letter A = bearing shell (1) color Yellow with lubricating groove.

Code letter B = Bearing shell (1) in blue with lubricating groove.

Code letter C = bearing shell (1) color Red with lubricating groove.

Code numbers on crankshaft:

Fig 5: Identifying Bearing Shells With/Without Lubricating Groove

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Code number 1 = bearing shell (2) Yellow without lubricating groove.

ID code 2 = Bearing shell (2) in blue without lubricating groove.

Code number 3 = bearing shell (2) Red without lubricating groove.

IMPORTANT: The color set yellow and red must not be installed, bearing colors blue/blue must be selected for this color set.

Installation note:

Possible color combinations for mounting the crankshaft in the crankcase.

Installation example:

For bearing 1 with the code letter C at the crankcase and the ID code 2 on the crankshaft , the bearing shell (1) in red is required for the top part of the crankcase and a bearing shell (2) in blue is required for the crankcase lower section (bedplate).

Fig 6: Identifying Bearing Shells With/Without Lubricating Groove

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Bearing 2: A and 2 in yellow and blue.

Bearing 3: C and 2 in red and blue.

Bearing 4: A and 1 colors Yellow and Yellow.

Bearing 5: C and 1 in blue and blue.

IMPORTANT: The color set yellow and red must not be installed, bearing colors blue/blue must be selected for this color set.

(A 1) Crankcase/Yellow	(B 1) Crankcase/Blue	(C 1) Crankcase/Blue
(A 1) Crankcase lower section/Yellow	(B 1) Crankcase lower section/Yellow	(C 1) Crankcase lower section/Blue
(A 2) Crankcase/Yellow	(B 2) Crankcase/Blue	(C 2) Crankcase/Red
(A 2) Crankcase lower section/Blue	(B 2) Crankcase lower section/Blue	(C 2) Crankcase lower section/Blue
(A 3) Crankcase/Blue	(B 3) Crankcase/Blue	(C 3) Crankcase/Red
(A 3) Crankcase lower section/Blue	(B 3) Crankcase lower section/Red	(C 3) Crankcase lower section/Red

NOTE: Guide bearing shell (1) at bearing seat 3 is a thrust bearing.

Fig 7: Identifying Guide Bearing Shell At Bearing Seat 3

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IMPORTANT: Do not use any metal-cutting tools.
Only use special tool 11 4 470 to clean sealing surfaces.

Installation note:

Clean all sealing surfaces.

Install bearing shells and guide bearing shell.

Fig 8: Installing Bearing Shells And Guide Bearing Shell

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Installation note:

If a radial clearance needs to be redetermined, use special tool 00 2 590 to do this.

Installation note:

All measuring points must be clean and free from oil and grease. If necessary, clean all measuring points.

The old bearing screws can be used to determine the radial clearance.

Set up CRANKCASE LOWER SECTION with bearing shells.

Remove crankcase lower section.

Read off RADIAL CLEARANCE at width of flattened Plastigage and measuring scale.

Installation note:

Remove Plastigage.

Apply a light coat of oil to bearing shells and crankshaft.

Fig 9: Measuring Radial Clearance Using Flattened Plastigage And Measuring Scale

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Fit CRANKCASE LOWER SECTION .

Assemble engine.