11 25 530 Removing and installing or replacing all pistons (M57T2-SCR)

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.

Special tools required:

Necessary preliminary work:

Remove ENGINE .
Remove CYLINDER HEAD .
Removing OIL SUMP .
Remove OIL PUMP .

IMPORTANT: Re-install the piston, connecting rod and bearing shells back in the same location and in the same installation position.
Connecting rods and bearing caps are designated with the same matching number: do not mix them.
Replace connecting rod bolts.

Unscrew connecting rod bearing cap.

Pull out connecting rod and piston to the cylinder head side.

IMPORTANT: Position crankshaft vertically.
Proceed with care at the cylinder wall and oil spray nozzles Risk of damage.

Fig 1: Locating Connecting Rod Bearing Cap

Courtesy of BMW OF NORTH AMERICA, INC.

Preliminary work:

Secure special tool 11 6 111 in vice.

Secure piston (1) with connecting rod to special tool 11 6 111 .

Graphic shows N52.

Fig 2: Securing Piston With Connecting Rod To Special Tool 11 6 111

Courtesy of BMW OF NORTH AMERICA, INC.

WARNING: Safety goggles must be worn for the next operation.

WARNING: Safety goggles must be worn.

Lever out piston circlip with special tool 11 4 492 in direction of arrow.

IMPORTANT: Piston and gudgeon pin are matched to each other.
They must not be mixed up.

Fig 3: Removing Piston Circlip With Special Tool 11 4 492

Courtesy of BMW OF NORTH AMERICA, INC.

Before installation, measure piston installation clearance. Measure piston diameter with micrometer at measuring point A from lower edge of piston and offset at 90° to the axis of the gudgeon pin.

Distance A, refer to TECHNICAL DATA .

Fig 4: Measuring Piston Diameter

Courtesy of BMW OF NORTH AMERICA, INC.

Adjust micrometer to cylinder bore of engine block. Set internal measuring device on micrometer to zero. Measure bottom, center and top of cylinder bore in direction of travel and direction of rotation.

Diameter of the cylinder bore, refer to technical data. See 1125 PISTONS WITH RINGS AND PINS (M57T2/TOP/SCR/D30) .

Piston installation clearance. Refer to technical data. See 1125 PISTONS WITH RINGS AND PINS (M57T2/TOP/SCR/D30) .

Fig 5: Adjusting Micrometer To Cylinder Bore Of Engine Block

Courtesy of BMW OF NORTH AMERICA, INC.

Permitted total wear clearance, refer to technical data. See 1125 PISTONS WITH RINGS AND PINS (M57T2/TOP/SCR/D30) .

If necessary, replace connecting rods.

The BMW Parts Department only supplies connecting rods in complete sets.

NOTE: The gudgeon pin must be able to be pressed through the bush by hand with little force and must not display any significant play.

Fig 6: Pressing Connecting Rod Pin

Courtesy of BMW OF NORTH AMERICA, INC.

Replace CONNECTING ROD BEARING SHELLS .

Fit connecting rod to piston in such a way that both of the visible matching numbers on the arrow indicating direction of installation on the piston point to the right.

Fig 7: Locating Connecting Rod Numbers

Courtesy of BMW OF NORTH AMERICA, INC.

WARNING: Safety goggles must be worn.

Insert piston circlip (2) into groove (1) of special tool 11 6 112 .

Bring piston circlip into installation position.

Fig 8: Inserting Piston Circlip Into Groove Of Special Tool (11 6 112)

Courtesy of BMW OF NORTH AMERICA, INC.

WARNING: Safety goggles must be worn.

Guide lug and aperture on special tool 11 6 112 must point to piston crown; only then can special tool 11 6 113 be fitted correctly.

If special tools 11 6 112 and 11 6 113 are correctly positioned, the piston the circlip for gudgeon pin must be driven in with a plastic hammer in the direction of the arrow.

NOTE: See Fig 9.

Fig 9: Pressing Special Tools (11 6 113)