Allocation Of Main Bearing Shells For Used And Reworked Crankshafts

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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.
For used and reworked crankshafts, the main crankshaft journals must be measured in order to allocate the matching bearing shells.
Crankshaft dimensions, refer to CRANKSHAFT DIMENSIONS .
Thicker over-sized bearing shells are available for reworked crankshafts. These have the same color markings as the original-size bearing shells.

Letter on cylinder block		Color of bearing
R	=	Red
G	=	Yellow
B	=	Blue

Allocation of Crankshaft Bearing Shells for Guide Frame

For used and reworked crankshafts, the main crankshaft journals must be measured in order to allocate the matching bearing shells.
Any other markings on the crankshaft are invalid when reworking crankshafts.
Allocate bearing shells to the determined diameter of main crankshaft journals according to the following table.

Main Crankshaft Journals Diameter	Color Identification of Bearing Shells for Guide Frame
Dimensions in mm	Red	Yellow	Blue
Basic dimension 65.000 ¹⁾	64.978 to 64.972	64.972 to 64.965	64.965 to 64.958
Repair stage 64.750 ¹⁾	64.728 to 64.722	64.722 to 64.715	64.715 to 64.708
¹⁾ The same color marking is valid for the thicker over-sized bearing for reworked crankshafts as for new crankshafts despite the greater bearing thickness.