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Home >> Mini >> 2010 >> Cooper S, 2D Hatchback, Standard >> Repair and Diagnosis >> External Pages >> Different car >> Section 2644 (Engine - Technical Data - N51 - E90) >> Pistons with Rings and Pins N51/B30 >> 11 25 Pistons with Rings and Pins N51 B30

11 25 Pistons with Rings and Pins N51 B30

WARNING: This page does not describe the selected car, but rather 6 other vehicles, including the 2011 BMW 328xi, 2011 BMW 328i, 2010 BMW 328xi, 2010 BMW 328i, and 2009 BMW 328xi. 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 14
Piston diameter at measuring point "A"    
Original (new dimension) mm 84.990±0.014
Repair stage (new dimension) mm %
Oversize (new dimension) mm 84.240±0.014
Piston installation clearance (piston new) mm 0.000 ... 0.043
Piston installation clearance (piston worn) mm 0.020...0.047
Permissible total wear tolerance between piston and cylinder (engine operated) mm 0.15


PISTONS WITH RINGS AND PINS SPECIFICATION

1st groove    
End clearance mm 0.18...0.33
Axial play mm 0.020...0.060
2nd groove    
End clearance mm 0.30...0.50
Axial play mm 0.020...0.060
3rd groove    
End clearance mm cannot be measured
Axial play mm cannot be measured