1125530 Removing and installing/replacing all pistons (N51): Notes
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.
WARNING:
Protective goggles must be worn when working on the piston pin circlip.
IMPORTANT:
If pistons, conrods and bearing shells are reused, they must be reinstalled in the same places.
Individual conrod replacement is not permitted; they are classified according to weight categories.
Conrods and conrod bearing caps are denoted with the same pairing letters; mixing them up will result in engine damage.
Piston and piston pins are paired and must not be fitted individually.
Individual conrod replacement is not permitted; they are classified according to weight categories.
Conrods and conrod bearing caps are denoted with the same pairing letters; mixing them up will result in engine damage.
Piston and piston pins are paired and must not be fitted individually.
Necessary preliminary tasks:
- Remove ENGINE .
- Mount engine on assembly stand .
- Remove intake air manifold.
- Remove CYLINDER HEAD .
- Remove ENGINE OIL SUMP .
- Remove OIL PUMP .
NOTE:
In event of heavy oil carbon residue:
Carefully remove oil carbon residue from cylinder wall.
Carefully remove oil carbon residue from cylinder wall.
NOTE:
Illustrations show N46.
Do not release screw (1).
Oil spray nozzle (2) must not be maladjusted or bent (risk of damage).
READJUST if necessary.
Release conrod bolts (1).
Tightening torque, 11 24 1AZ .
Remove conrod bearing cap (2) in direction of arrow.
IMPORTANT:
Conrods and conrod bearing caps are denoted with the same pairing letters; mixing them up will result in engine damage.
Attach special tool 11 8 330 ASSEMBLY TOOL in conrod big end.
Press out conrod and piston to cylinder head side.
IMPORTANT:
Risk of damage
to oil spray nozzle.