31 00.. Notes on repairing threads

IMPORTANT: Install Heli-coil thread inserts so that they are flush with the original thread.

NOTE: Damaged threads in engine support may be repaired with Heli-coil thread inserts. Comply with the procedure described in the example.

Fig 1: Identifying Damaged Heli-coil Thread

Courtesy of BMW OF NORTH AMERICA, INC.

Procedure:

Create a clean core hole; if necessary, drill out screw remnants

Fig 2: Drilling Core Hole
Courtesy of BMW OF NORTH AMERICA, INC.
Create locating thread for Heli-coil thread insert

Fig 3: Drilling Thread For Heli-coil Thread Insert
Courtesy of BMW OF NORTH AMERICA, INC.
Pick out Heli-coil thread insert in accordance with the TABLE and screw into the locating thread until flush with the original thread

Fig 4: Inserting Heli-coil Thread Into Locating Thread
Courtesy of BMW OF NORTH AMERICA, INC.
Break drive pin and remove

Fig 5: Breaking Drive Pin

Courtesy of BMW OF NORTH AMERICA, INC.