bmw Workshop Repair Guides

BMW Workshop Service and Repair Manuals

1 RA Replacing Crankshaft - Crankshaft Removed (M50)|Page 485 > < 1 RA Replacing Crankshaft - Crankshaft Removed (M50)|Page 483
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Installation:

Check conrod-bearing play.

Place Plastigage (Type PG 1) - source of supply: Cartool - on
crankshaft wiped clean of oil in BDC position.

Mount conrod-bearing caps and tighten with old conrod bolts
tightened to specified torque.

Attention!

Do not turn the connecting rods or crankshaft.

Remove bearing covers and read bearing play by measuring
width of the flattened Plastigage with help of the supplied
scale. Specified values: 0.020 ... 0.055 mm.

Install new bearing shells or bearing shells with a different colour
code to correct the bearing play.

Summary: colour code/shaft diameter/bearing-shell thickness,
refer to Technical Data

Double-classification colour codes:

Rt

Red

Bl

Blue

1. 

Crankpin 

2. 

Bearing play

3. 

Bearing-shell thickness

4. 

Conrod eye

Tightening procedures for main-bearing cap:

Tighten bolts (washed and lubricated with oil) in two steps.

First step tightening torque 23 Nm

Second step torque angle 50

°

RA  Replacing crankshaft - crankshaft removed (M50)

BMW AG - TIS

08.02.2013  11:26

Issue status (12/2007) Valid only until next DVD is issued

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1 RA Replacing Crankshaft - Crankshaft Removed (M50)|Page 485 > < 1 RA Replacing Crankshaft - Crankshaft Removed (M50)|Page 483