BMW 7 Owners & Service Manuals

BMW 7 Series: Connecting Rod With Bearing

REPLACING ALL CONNECTING ROD BEARINGS (N63)

Notes

IMPORTANT: Note grinding stages on crankshaft.

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.

Install PISTON.

Connecting Rod With Bearing
Fig. 148: Identifying Blue Bearing Shell And Red Bearing Shell

Installation note: The bearing shells on the connecting rod are coded.

Connecting rod 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).

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

Connecting Rod With Bearing
Fig. 149: Locating Red Bearing Shell Fastening Notches And Blue Bearing Shell Fastening Notches

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.

Connecting Rod With Bearing
Fig. 150: Locating Special Tool 00 2 590

IMPORTANT: Do not distort connecting rods or crankshaft.

Use connecting rod bolts to check connecting-rod bearing play.

Connecting rod bolts with special tool 00 9 120.

Tightening torque 11 24 1AZ.

Connecting Rod With Bearing
Fig. 151: Checking Connecting-Rod Bearing Play

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

CONNECTING-ROD BEARING PLAY.

  • Remove plastic thread.
  • Lubricate crankshaft and bearing shells.
  • Install new connecting rod bolts.

Connecting Rod With Bearing
Fig. 152: Checking Connecting-Rod Bearing Play

Secure connecting rod bolts with special tool 00 9 120.

Tightening torque 11 24 1AZ.

Connecting Rod With Bearing
Fig. 153: Securing Connecting Rod Bolts With Special Tool 00 9 120

Assemble engine.

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