Cooper (R56) L4-1.6L (N12) (2008)
Piston: Service and Repair
11 25 530 Removing and installing/replacing all pistons (N12)
Special tools required:
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00 9 120
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11 9 620
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11 9 670
Warning:
Protective goggles must be worn when working on the gudgeon pin circlip.
Important:
If pistons, connecting rods and bearing shells are reused, they must be reinstalled in the same places. connecting rods and connecting rod
bearing caps are denoted with the same pairing letters; mixing them up will result in engine damage.
Piston and gudgeon pins are paired and must not be fitted individually.
Necessary preliminary tasks:
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Remove engine.
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Mount engine on assembly stand.
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Remove intake air manifold.
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Remove cylinder head.
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Remove engine oil sump
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Remove oil pump.
Note:
In event of heavy oil carbon residue:
Carefully remove oil carbon residue from cylinder wall.
Note:
Illustrations show N46.
Note:
Mark all pistons and conrods with a pen prior to removing.
Example N14:
Direction of arrow (1) points to camshaft drive.
Cylinder allocation (2) per cylinder.