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Home >> Mini >> 2010 >> Cooper S, 2D Hatchback, Standard >> Repair and Diagnosis >> External Pages >> Different car >> Section 2910 (Engine - Repair - E91) >> Piston With Rings And Pin >> 11 25 530 Removing and installing/replacing all pistons (N52K) >> Necessary preliminary tasks

Necessary preliminary tasks

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NOTE: Carefully remove heavy oil carbon residues from the cylinder wall (arrow).
IMPORTANT: Do not use any metal-cutting tools.
Fig 1: Locating Oil Carbon Residue On Cylinder Wall
G04751123Courtesy of BMW OF NORTH AMERICA, INC.
IMPORTANT: Oil spray nozzle (2) must not be maladjusted or bent.
Risk of damage! 

Do not  release screw (1) of oil spray nozzle (2).

If necessary, readjust OIL SPRAY NOZZLE  (2).

Fig 2: Identifying Screw Of Oil Spray Nozzle
G04751124Courtesy of BMW OF NORTH AMERICA, INC.

Release connecting rod bolts (1).

Tightening torque 11 24 1AZ .

Installation: 

Replace screws. 

Remove connecting rod bearing cap (2) in direction of arrow.

Fig 3: Removing Connecting Rod Bearing Cap
G04751125Courtesy of BMW OF NORTH AMERICA, INC.
IMPORTANT: Connecting rod and big end bearing cap (2) are marked with identical pairing letters and must not be mixed up.
Danger of engine damage! 

Attach special tool 11 8 330 to connecting rod.

Press out connecting rod and piston with special tool 11 8 330 towards cylinder head side.

NOTE: Special tool 11 8 330 also serves to prevent connecting rod and piston from falling down.
Fig 4: Pressing Connecting Rod And Piston Using Special Tool (11 8 330)
G04751126Courtesy of BMW OF NORTH AMERICA, INC.
IMPORTANT: Do not touch the oil spray nozzle when removing the components.
Risk of damage!