Workshop Manual

L8
009W2329-R01
Repair dimensions of crankshaft
The crankshaft is made of drop-forged, heat-treated steel. Thus it is possible to gring the
crankshaft without subsequent surface treatment.
The crankshaft must never be repaired with hard chromium-plate or metal feeding, but only by
grinding in accordance with the below mentioned measures and tolerances to which we supply
undersize bearings.
The crankshaft should be ground, if it is oval and the smallest diameter is 0.05 mm (0.002 inch)
below the diameter it had when leaving the factory.
Connecting rod journals
Standard .................................................................. 53.987 – 54.000 mm (2.1255 – 2.1260”)
0.6 mm undersize .................................................... 53.387 – 53.400 mm (2.1019 – 2.1024”)
Clearance between bearing and journal…………..…..0.028 – 0.068 mm (0.0011 – 0.0027”)
Main bearing journals
Standard .................................................................. 61.981 – 62.000 mm (2.4402 – 2.4409”)
0.6 mm undersize .................................................... 61.381 – 61.400 mm (2.4166 – 2.4173”)
Clearance between bearing and journal .................. ..0.048 – 0.112 mm (0.0019 – 0.0044”)
Main bearings
The engine is fitted with four two-piece main bearings as shown on the drawing below.
The bearings must be changed when the “red” layer under the bearing metal can be seen
faintly, or if the bearings are much scratched.
Bearing shell: C10 2.1 mm thick
Bearing material: tin aluminium with net structure
External surface: tinned 0.001 mm thick