Dismantled N54 short motor suitable for someone wanting to rebuild a motor. Block and crankshaft have been checked by Wynnum Engine Reconditioning. Block has been decked 0.004". As measurement show below block will need to be bored to Stage 1 (84.250 mm). Crank has had the journals polished. Journals and bores have all been measured. New conrods and pistons would be required. As all these parts would be difficult and costly to freight, a local buyer would be preferred. $1,000.
BMW N54 Engine Measurements
Crankshaft Main Bearing Journals N54 B30
Ground sizes of main bearing journals Main bearing journal
Original (designation S1) 55.998...55.993 mm
Original (designation S2) 55.992...55.987 mm
Original (designation S3) 55.986...55.981 mm
Crankshaft bearing clearance, radial 0.020...0.046 mm
Max. permitted runout at centre crankshaft journal 0.15 mm
Main Bearing Journals (Crankshaft) Main Tunnels (Block)
1. 55.982 S3 61.993
2. 55.990 S2 61.993
3. 55.995 S1 61.993
4. 55.994 S1 61.995
5. 55.992 S2 61.992
6. 55.992 S1 61.992
7. 64.987 S2 61.990
Crankshaft Conrod Journals N54 B30
Ground sizes of conrod bearing journals
Stage (b) 49.9730 ... 49.9834 mm
Stage (r) 49.9835 ... 49.9930 mm
Radial conrod bearing play 0.025 ... 0.070 mm
Crankshaft Conrod Journals
1. 49.985 Stage (r)
2. 49.990 Stage (r)
3. 49.987 Stage (r)
4. 49.987 Stage (r)
5. 49.990 Stage (r)
6. 49.985 Stage (r)
Engine Block Cylinders N54 B30
Bore ∅ stage 0a) 84,000+0,02 mm
Bore ∅ stage 00 a)
Bore ∅ stage 1 a) 84,250+0,02 mm
Permitted out-of-round of cylinder bore a) 0,01 mm
Permitted conicity of cylinder bore a) 0,01 mm
Permissible total wear tolerance between piston and cylinder (engine operated) 0,15 mm
All Bores are 84 + 0.025-0.05 mm
