11 21 Crankshaft And Bearings N52K B25
WARNING: This page does not describe the selected car, but rather 6 other vehicles, including the 2013 BMW 128i, 2012 BMW 128i, 2011 BMW 128i, 2010 BMW 128i, and 2009 BMW 128i. However, it is still accessible from the selected car via links, so may be relevant.
CRANKSHAFT AND BEARINGS SPECIFICATION
| Ground sizes of main bearing journals | main bearing journal | |
| Original (designation S1) | mm | 55.998... 55.993 |
| Original (designation S2) | mm | 55.992... 55.987 |
| Original (designation S3) | mm | 55.986... 55.981 |
| Crankshaft bearing clearance, radial | mm | 0.020... 0.046 |
| Max. permitted runout at center crankshaft journal | mm | 0.150 |
CRANKSHAFT AND BEARINGS SPECIFICATION
| Grinding stages, crankshaft guide bearing | ||
| Standard | mm | 24.0 F8 |
| Crankshaft axial play | mm | 0.060... 0.250 |
CRANKSHAFT AND BEARINGS SPECIFICATION
| Ground sizes of conrod bearing journals | ||
| Standard | mm | 50.000 -0.007 -0.027 |
| Radial conrod bearing play | mm | 0.025... 0.070 |
CRANKSHAFT AND BEARINGS SPECIFICATION
| Ground sizes of main bearing journals | main bearing journal | |
| Original (designation S1) | mm | 55.998...55.993 |
| Original (designation S2) | mm | 55.992...55.987 |
| Original (designation S3) | mm | 55.986...55.981 |
| Grinding stage 1 (designation B1) | mm | 55.748...55.742 |
| Grinding stage 1 (designation B2) | mm | 55.742...55.737 |
| Grinding stage 1 (designation B3) | mm | 55.737...55.731 |
| Grinding stage 2 (designation C1) | mm | 55.498...55.492 |
| Grinding stage 2 (designation C2) | mm | 55.492...55.487 |
| Grinding stage 2 (designation C3) | mm | 55.487...55.481 |
| Crankshaft bearing clearance, radial | mm | 0.020...0.046 |
| Max. permitted runout at center crankshaft journal | mm | 0.150 |