Disassembling and assembling lock barrel (lock barrel removed) (M4 Coupe, M4 Convertible)

Sort supplied retainers (1) according to illustration.

(X) Embossed number on retainer (1)

(Y) Installation position in lock barrel

Courtesy of BMW OF NORTH AMERICA, INC.

Insert spring (1) into first position of lock barrel (2).

Courtesy of BMW OF NORTH AMERICA, INC.

Insert retainer (1) with lowest stamped number (X) in first position (Y) in lock barrel (2) so that it snaps into place audibly.

Courtesy of BMW OF NORTH AMERICA, INC.

Insert ignition key (1) in lock barrel (3) and check whether retainer (2) is flush with housing.

1. OK
2. not OK

Courtesy of BMW OF NORTH AMERICA, INC.

If retainer (2) is not OK, press retainer (2) out of lock barrel (3) with a suitable tool (1).

Repeat work operations with retainer (2) with next higher number (X) until correct retainer (2) has been found.

Carry out all further positions in lock barrel as described in the process above.

Courtesy of BMW OF NORTH AMERICA, INC.