11 25 PISTON WITH RINGS AND BOLTS (M550i xDrive, 2018-2019)
1125 TECHNICAL DATA OVERVIEW
| Permissible total wear tolerance between piston and cylinder (engine operated) |
| Piston installation clearance (piston worn) |
0.25 mm |
| Piston installation clearance (piston new) |
| Piston installation clearance (piston new) |
0.003... 0.023 mm |
| Piston installation clearance (piston worn) |
| Piston installation clearance (piston worn) |
0.02... 0.03 mm |
| Piston measuring point "A" |
| Measuring point (position) A. |
7.5 mm |
| Piston original (new dimension) |
| Measuring point (position) A. |
88.977... 88.987 mm |
| Piston oversize (0.25) |
| Measuring point (position) A. |
89.227... 89.247 mm |
| Piston ring 1st groove A |
| Side clearance. |
0.02... 0.07 mm |
| Piston ring 1st groove H |
| Annular groove height. |
1.21... 1.24 mm |
| Piston ring 1st groove S |
| End clearance. |
0.15... 0.30 mm |
| Piston ring 2nd groove A |
| Side clearance. |
0.015... 0.06 mm |
| Piston ring 2nd groove H |
| Annular groove height. |
1.51... 1.53 mm |
| Piston ring 2nd groove S |
| End clearance. |
0.30... 0.50 mm |
| Piston ring 3. Groove-A DSF ring |
| Side clearance without spiral expander. |
0.02... 0.06 mm |
| Piston ring 3. Groove-A U-flex ring |
| Side clearance without spiral expander. |
0.02... 0.08 mm |
| Piston ring 3rd groove H |
| Annular groove height. |
2.01... 2.03 mm |
| Piston ring 3rd groove S |
| End clearance without spiral expander. |
0.25... 0.50 mm |
| Vibration damper N6302 B44 |
| Max. permitted radial runout |
0.20 mm |
| Vibration damper N6302 B44-1 |
| Max. permitted axial runout |
0.20 mm |