Main Bearing Shells, Used And Reworked Crankshafts, Allocating

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Fig 1: Allocation Of Crankshaft Bearing Shells For Cylinder Block

Courtesy of AUDI OF AMERICA, LLC

Bearing shells are allocated to cylinder block corresponding to color markings stamped into cylinder block.
With used and reworked crankshafts, the crankshaft pivot pins must be measured to allocate the appropriate bearing shells.
Crankshaft dimensions, refer to CRANKSHAFT DIMENSIONS .
Thicker over-sized bearing shells are available for a reworked crankshaft. These have the same color markings as the original-size bearing shells.

Letter on Cylinder Block		Color of Bearing
R	=	red
S	=	Black
G	=	yellow
U	=	Green
B	=	Blue

Allocation of Crankshaft Bearing Shells for Guide Frame

With used and reworked crankshafts, the crankshaft pivot pins must be measured to allocate the appropriate bearing shells.
Any other markings on the crankshaft are invalid when reworking a crankshaft.
Allocate bearing shells to the diameter of the main crankshaft pivot pins using the following table

Crankshaft with Crankshaft Bearing Journal Diameter 65 mm

Crankshaft Bearing Journal Diameter

Color Identification of Bearing Shells for Guide Frame

Dimensions in mm

Red

Black

Yellow

Green

Blue

Basic dimension 65.000

64.978 to 64.975

64.974 to 64.971

64.970 to 64.967

64.966 to 64.963

64.962 to 64.958

Repair stage 64.750 ¹⁾⁽¹⁾

64.728 to 64.725

64.724 to 64.721

64.720 to 64.717

64.716 to 64.713

64.712 to 64.708

⁽¹⁾	¹⁾ The same color marking applies to the thicker over-sized bearing for reworked crankshafts as for a new crankshaft despite the greater bearing thickness.

Crankshaft with Crankshaft-Pivot Pin 67 mm Diameter

Crankshaft Bearing Journal Diameter

Color Identification of Bearing Shells for Guide Frame

Dimensions in mm

Red

Black

Yellow

Green

Blue

Basic dimension 65.000

66.990 to 66.87

66.986 to 66.983

66.982 to 66.979

66.978 to 66.975

66.974 to 66.971

Repair stage 64.750 ¹⁾ 1

66.740 to 66.737

66.736 to 66.733

66.732 to 66.729

66.728 to 66.725

66.724 to 66.721

⁽⁾	The same color marking applies to the thicker over-sized bearing for reworked crankshafts as for a new crankshaft despite the greater bearing thickness.