2B•2 Engine removal and general overhaul procedures
Balance shafts
Endfloat 0.050 to 0.450 mm
Diameter of journal:
Larger, inner 39.900 ± 0.008 mm
Smaller, outer 19.947 to 19.960 mm
Diameter of bearing:
Larger, inner 39.988 to 40.043 mm
Smaller, outer 20.000 to 20.021 mm
Bearing running clearance (maximum) 0.080 to 0.151 mm
Pistons
Note: Piston diameter is measured at right-angles to the piston boss, at the specified distance from the bottom of the skirt.
Distance from bottom of skirt
B202 16.00 mm
B234, models up to 1993 9.0 mm
B204L/S, B234L7R/E, 1994-on models 9.3 mm
B204I and B234i,1994-on models 11.0 mm
Piston diameter:
B202I:
Standard A 89.971 to 89.980 mm
Standard AB 89.980 to 89.989 mm
Standard B 89.989 to 90.000 mm
Standard C 90.000 to 90.008 mm
First oversize (0.5 mm) 90.470 to 90.485 mm
Second oversize (1.0 mm) 90.970 to 90.985 mm
Nominal piston clearance (new) 0.010 to 0.039 mm
B202 Turbo and B202S:
Standard A 89.967 to 89.977 mm
Standard AB 89.977 to 89.985 mm
Standard B 89.985 to 89.993 mm
Standard C 89.993 to 90.009 mm
First oversize (0.5 mm) 90.470 to 90.485 mm
Second oversize (1.0 mm) 90.970 to 90.985 mm
Nominal piston clearance (new) 0.015 to 0.043 mm
B204 and B234:
Standard A 89.971 to 89.980 mm
Standard AB 89.980 to 89.989 mm
Standard B:
B234i up to 1993 89.989 to 90.000 mm
B204/B234 from 1994 on 89.989 to 90.000 mm
B234 Turbo up to 1993 89.989 to 89.997 mm
Standard C:
B234i up to 1993 : 90.000 to 90.013 mm
B204/B234 from 1994 90.000 to 90.013 mm
B234 Turbo up to 1993 89.997 to 90.013 mm
First oversize (0.5 mm) 90.482 to 90.488 mm
Second oversize (1.0 mm) 90.972 to 90.988 mm
Nominal piston clearance (new):
Models up to 1993 0.006 to 0.041 mm
Models from 1994 on 0.011 to 0.041 mm
Connecting rods
Maximum weight difference between any two connecting rods:
B202 9.0 g
B204/B234 6.0 g
Crankshaft
Endfloat (all engines) 0.06 to 0.31 mm
Main bearing journal diameter:
Standard 57.981 to 58.000 mm
First undersize 57.731 to 57.750 mm
Second undersize 57.481 to 57.500 mm
Third undersize 57.237 to 57.250 mm
Fourth undersize 56.987 to 57.000 mm
Big-end bearing journal diameter:
Standard 51.981 to 52.000 mm
First undersize 51.731 to 51.750 mm
Second undersize 51.481 to 51.500 mm
Third undersize 51.237 to 51.250 mm
Fourth undersize . 50.987 to 51.000 mm