11 24 571 Replace all big-end bearings (N74)

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IMPORTANT: Note grinding stages on crankshaft. See CONROD BEARING JOURNALS , CRANKSHAFT GUIDE BEARING , MAIN BEARING JOURNALS (1) , and MAIN BEARING JOURNALS (2-7) .

Necessary preliminary tasks:

Remove all PISTONS .

Install new connecting rod bearing shells.

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

Fig 1: Identifying Blue And Red Bearing Shell

G08469219

Courtesy of BMW OF NORTH AMERICA, INC.

Install PISTON .

Installation:

The bearing shells on the conrod are coded.

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

Conrod (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 Conrod And Conrod Bearing Cap

G08469220

Courtesy of BMW OF NORTH AMERICA, INC.

Check connecting rod bearing clearance .

Piston in BDC position.

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

Fit bearing caps so that pair numbers match up.

Fig 3: Locating Bearing Caps Pair Numbers

G08469221

Courtesy of BMW OF NORTH AMERICA, INC.

IMPORTANT: Do not distort connecting rods or crankshaft.

Use conrod bolts to check conrod bearing clearance.

Connecting rod bolts with special tool 00 9 120 .

Tightening torque: see 1AZ in 11 24 CONNECTING RODS AND BEARINGS

Fig 4: Tightening Connecting Rod Bolts Using Special Tool 00 9 120

G08469222

Courtesy of BMW OF NORTH AMERICA, INC.

Remove bearing cap and read off bearing play at width of flattened plastic thread with assistance of measurement scale.

CONROD BEARING CLEARANCE .

Remove plastic thread.
Lubricate crankshaft and bearing shells.
Install new conrod bolts.

Fig 5: Measuring Conrod Bearing Clearance Using Measurement Scale

G08469223

Courtesy of BMW OF NORTH AMERICA, INC.

Join connecting rod bolt (1).

Tightening torque: see 1AZ in 11 24 CONNECTING RODS AND BEARINGS

Installation:

Check entire angle adjustment.

For better overview of screw connection quality.

After joining, use an oil-resistant marker to apply a stroke (1) on the bolt head (see illustration).

Fig 6: Identifying Oil-Resistant Marker Stroke On Bolt Head

G08469224

Courtesy of BMW OF NORTH AMERICA, INC.

Secure connecting rod bolts with special tool 00 9 120 .

Tightening torque: see 1AZ in 11 24 CONNECTING RODS AND BEARINGS

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

G08469225

Courtesy of BMW OF NORTH AMERICA, INC.

Assemble engine.