11 25 Pistons with Rings and Pins
WARNING: This page does not describe the selected car, but rather 33 other vehicles, including the 2018 BMW M6, 2018 BMW 650i xDrive, 2018 BMW 650i, 2018 BMW 640i xDrive, and 2018 BMW 640i. However, it is still accessible from the selected car via links, so may be relevant.
PISTONS WITH RINGS AND PINS SPECIFICATION
| Piston and pin are paired to each other - replace together only. | ||
| Measuring point "A" (position) | mm | 8 |
| Piston diameter at measuring point "A" | ||
| Original (new dimension) | mm | 88.97... 88.99 |
| Oversize (0.25) | mm | 89.22... 89.24 |
| Oversize (0.50) | mm | % |
| Piston installation clearance (piston new) | mm | 0.03...0.04 |
| Piston installation clearance (piston worn) | mm | 0.02...0.05 |
| Permissible total wear tolerance between piston and cylinder (engine operated) |
mm | 0.15 |
PISTONS WITH RINGS AND PINS SPECIFICATION
| 1st groove | ||
| Height | mm | 1.21... 1.25 |
| End clearance | mm | 0.15...0.25 |
| Side clearance | mm | 0.02...0.08 |
| 2st groove | ||
| Height | mm | 1.51... 1.53 |
| End clearance | mm | 0.35...0.55 |
| Side clearance | mm | 0.02...0.06 |
| 3rd groove | ||
| Height | mm | 2.01... 2.03 |
| End clearance without spiral expander | mm | 0.25...0.50 |
| Side clearance without spiral expander | mm | 0.02... 0.06 |