11 24 571 Replace all connecting rod bearings (N63O1)

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Special tools required:

IMPORTANT: Note grinding stages on crankshaft. See N63O1 ENGINE .

Necessary preliminary work:

Removing all PISTONS .

Install new connecting rod bearing shells.

Install one blue bearing shell (1) and one red bearing shell (2) in each connecting rod.

NOTE: Illustrations shows N63 engine.

Fig 1: Identifying Connecting Rod Bearing Shells

G10042347

Courtesy of BMW OF NORTH AMERICA, INC.

Installation note:

The bearing shells on the connecting rod are coded.

Connecting rod bearing cap (1): the red bearing shell is engaged and the fastening notches are on the left and right sides of the bearing shell (see arrows in illustration).

Connecting rod (2): the blue bearing shell is fitted and the fastening notches are one side of the bearing shell (see arrows in illustration).

Fig 2: Identifying Notches In Bearing Shells

G10042348

Courtesy of BMW OF NORTH AMERICA, INC.

IMPORTANT: New connecting rods must be vacuum cleaned prior to installation.
Do not use compressed air to blow off cracked areas.

Use a commercially available vacuum cleaner (2) to vacuum clean cracked areas (1).

Fig 3: Cleaning Cracked Areas Using Vacuum Cleaner

G10042349

Courtesy of BMW OF NORTH AMERICA, INC.

Check connecting-rod bearing play.

Piston in BDC position.

Fit special tool 00 2 590 (Plastigage type PG 1) to oil-free crankshaft.

Fit bearing caps so that matching numbers match up.

Fig 4: Matching Connecting Rod Cap With Connecting Rod

G10042350

Courtesy of BMW OF NORTH AMERICA, INC.

IMPORTANT: Do not turn connecting rod and crankshaft (2).

Use connecting rod bolts (1) to check connecting-rod bearing play.

Secure connecting rod bolts (1) with special tool 00 9 120 .

Tightening torque 11 24 1AZ .

Note the pairing letters (3).

Fig 5: Identifying Crankshaft, Connecting Rod Bolts, And Pairing Letters

G10042351

Courtesy of BMW OF NORTH AMERICA, INC.

Remove bearing cap and read off radial clearance at width of crushed plastigage with assistance of measuring scale.

Fig 6: Reading Connecting Rod Bearing Radial Clearance Using Plastigage

G10042352

Courtesy of BMW OF NORTH AMERICA, INC.

CONNECTING-ROD BEARING PLAY .

Remove Plastigage.
Lubricate crankshaft and bearing shells.
Install new connecting rod bolts.

Secure connecting rod bolts with special tool 00 9 120 .

Tightening torque 11 24 1AZ .

NOTE: Illustrations shows N63 engine.

Fig 7: Tightening Connecting Rod Bolts Using Special Tool (00 9 120)

G10042353

Courtesy of BMW OF NORTH AMERICA, INC.

Assemble engine.