11 21 531 Replacing All Crankshaft Main Bearings (N54)

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Special tools required:

00 2 590
11 4 470
11 8 510

IMPORTANT:

Aluminum screws/bolts must be replaced each time they are released .

The end faces of aluminum screws/bolts are painted blue for the purposes of reliable identification.

Jointing torque and angle of rotation must be observed without fail (risk of damage) .

Necessary preliminary tasks:

Remove crankshaft.

Check setting of oil spray nozzles, adjusting if necessary:

Attach special tool 11 8 510 to bolt connection on main bearing, secure with bolt (1). (See 11 8 510 GAUGE )

Installation:

Oil nozzle must be located precisely in groove of special tool 11 8 510; adjust if necessary. (See 11 8 510 GAUGE )

Fig 1: Identifying Special Tool (11 8 510) On Main Bearing

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Adjust oil nozzle.

Release screw (1).

Tightening torque, see 11 11 5AZ in ENGINE -- TORQUE SPECIFICATIONS -- TWIN TURBO

Fig 2: Identifying Screw

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Remove bearing shells (2) and (3).

NOTE:

Guide bearing shell (3) is a thrust bearing.

Observe bearing classification. (See 11 21 CRANKSHAFT AND BEARINGS N54 B30 )

Fig 3: Identifying Bearing Shells

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Installation:

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

Bearing shell (2) without lubricant groove must be fitted in crankcase lower section (bed plate).

Fig 4: Locating Bearing Shell

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Bearing classification (1) of crankshaft as per table (values 1 to 3).

Bearing classification (2) of connecting rods as per table (values b and r). (See 11 24 571 REPLACING ALL CONNECTING ROD BEARINGS (N54) )

Fig 5: Locating Bearing Classification Of Connecting Rods

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Bearing classification (1) in crankcase as per table (values of A/B/C).

Installation:

When all the letters and number code have been determined, the bearing shell color must be allocated, see COLOR COMBINATIONS TABLE .

IMPORTANT:

Engine damage will result if an insufficiently small bearing play is determined.

The color combination Yellow and Red must not be fitted. Possible color combinations, see COLOR COMBINATIONS TABLE .

Fig 6: Locating Bearing Classification Of Crankshaft

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COLOR COMBINATIONS TABLE

(A1) Bedplate/Yellow	(B1) Bedplate/Yellow	(C1) Bedplate/Green
(A1) Crankcase/Yellow	(B1) Crankcase/Green	(C1) Crankcase/Green
(A2) Bedplate/Green	(B2) Bedplate/Green	(C2) Bedplate/Green
(A2) Crankcase/Yellow	(B2) Crankcase/Green	(C2) Crankcase/Red
(A3) Bedplate/Green	(B3) Bedplate/Red	(C3) Bedplate/Red
(A3) Crankcase/Green	(B3) Crankcase/Green	(C3) Crankcase/Red

Insert all bearing shells (2 and 3).

IMPORTANT:

Clean sealing surfaces.

Do not clean sealing faces with a metal-cutting tool.

Clean sealing faces with special tool 11 4 470 only. (See 11 4 470 CLEANING KIT )

Determine bearing play with special tool 00 2 590.

Installation:

All measuring points must be free from oil and grease.

Use used screws to determine bearing play.

Set up crankcase lower section with bearing shells.

Fig 7: Identifying Crankshaft Bearing Shells

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Remove lower crankcase.

Read off bearing play at width of flattened plastic thread and measurement scale.

Crankshaft bearing clearance radial.

Installation:

Remove plastic thread.

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

Fig 8: Locating Bearing Shells & Crankshaft

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Install crankcase lower section.

Assemble engine.