Allocation of main bearing shells on used and machined crankshafts — AUDI
Allocation of main bearing shells on used and machined crankshafts on Audi: factory workshop procedure for engines BAR, BAS, BAT, BBK.
Workshop procedure for AUDI — the factory write-up, straight from real workshop data.
🔧 Engine codes this applies to
📋 Procedure
Allocation of main bearing shells on used and machined crankshafts
Allocation of crankshaft bearing shells for cylinder block
Bearing shells are allocated to the cylinder block according to the colour codes stamped on the cylinder block.
On a used and machined crankshaft, the crankshaft bearing journals must be measured in order to allocate the correct bearing shells.
Crankshaft dimensions
Chapter
.
Oversized (thicker) bearing shells are available for a machined crankshaft. However, these bearing shells have the same colour coding as the original-size bearing shells.
Letter on cylinder block
Colour coding of bearing
R
=
Red
S
=
Black
G
=
Yellow
Ü
=
Green
B
=
Blue
Allocation of crankshaft bearing shells for retaining frame
On a used and machined crankshaft, the crankshaft bearing journals must be measured in order to allocate the correct bearing shells.
Any markings still visible on a machined crankshaft are invalid.
Allocate the bearing shells according to the measured diameter of the crankshaft bearing journals as follows:
Crankshaft with crankshaft main bearing journal ∅ 65 mm
Crankshaft main bearing journal ∅
Colour code of bearing shells for retaining frame
Dimensions (in mm)
Red
Black
Yellow
Green
Blue
Basic dimension
65.000
64.978 … 64.975
64.974 … 64.971
64.970 … 64.967
64.966 … 64.963
64.962 … 64.958
Repair undersize
64.750
1)
64.728 … 64.725
64.724 … 64.721
64.720 … 64.717
64.716 … 64.713
64.712 … 64.708
1)
The colour codes for the oversized (thicker) bearing shells required for a machined crankshaft are the same as those on bearing shells for a new crankshaft, in spite of the greater bearing thickness.
Crankshaft with crankshaft main bearing journal ∅ 67 mm
Crankshaft main bearing journal ∅
Colour code of bearing shells for retaining frame
Dimensions (in mm)
Red
Black
Yellow
Green
Blue
Basic dimension
67.000
66.990 … 66.987
66.986 … 66.983
66.982 … 66.979
66.978 … 66.975
66.974 … 66.971
Repair undersize
64.750
1)
66.740 … 66.737
66.736 … 66.733
66.732 … 66.729
66.728 … 66.725
66.724 … 66.721
1)
The colour codes for the oversized (thicker) bearing shells required for a machined crankshaft are the same as those on bearing shells for a new crankshaft, in spite of the greater bearing thickness.
TorqFix answers live for your specific car — tell it the engine code and it serves the matching sequence, torque figures and wiring for that exact variant.
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Who makes these pages, and how
TorqFix was built by a mechanic — after a 2,700 km drive with five roadside repairs that no diagnostic tool could explain.
The figures on this page come from manufacturer workshop documentation and are shown as they are. The page is assembled automatically from that data — it is not written by an AI. The AI works in the chat, where it answers for your specific car. It writes nothing here.
Variants of the same model differ. Cross-check torque against the factory manual for your engine before final tightening.
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The story behind TorqFix →Workshop data on this page last updated 20 Sep 2026.