11 25 PISTON WITH RINGS AND BOLTS (M550i xDrive 2020-2022)
1125 TECHNICAL DATA OVERVIEW
| Permissible total wear tolerance between piston and cylinder (engine operated) |
| Piston installation clearance (piston worn) |
|
0.25 mm |
| Piston diameter |
| Measure the piston diameter at distance (A) from the lower end of the piston skirt. |
Distance (A) to the lower end of the piston skirt |
18 mm |
| Nominal dimension of piston diameter |
88.987 +0.02-0.02
mm |
| Piston installation clearance (piston new) |
| Piston installation clearance (piston new) |
|
0.003... 0.023 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 |