11 25 Pistons with Rings and Pins (N55 B30)
WARNING: This page is about a different car, the 2013 BMW X5, 2012 BMW X5, and 2011 BMW X5. However, it is still accessible from the selected car via links, so may be relevant.
PISTON RING GROOVE CLEARANCE SPECIFICATION
| 1st groove | ||
| End clearance | mm | 0.15... 0.30 |
| Axial play | mm | 0.020... 0.060 |
| 2nd groove | ||
| End clearance | mm | 0.30... 0.50 |
| Axial play | mm | 0.015... 0.060 |
| 3rd groove | ||
| End clearance | mm | 0.20... 0.90 |
| Axial play | mm | cannot be measured |
PISTONS AND PINS SPECIFICATION
| Piston and pin are paired to each other - replace together only. | ||
| Measuring point "A" (position) | mm | 12 |
| Piston diameter at measuring point "A" | ||
| Original (new dimension) | mm | 83.98... 84.01 |
| Repair stage (new dimension) | mm | 84.06... 84.09 |
| Oversize (new dimension) | mm | 84.23... 84.26 |
| Piston installation clearance (piston new) | mm | 0.01...0.03 |
| Piston installation clearance (piston worn) | mm | 0.02...0.08 |
| Permissible total wear tolerance between piston and cylinder (engine operated) | mm | 0.15 |