31 00... Notes on repairing threads

IMPORTANT: Install Helicoil thread inserts so that they are flush with the original thread.

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

Fig 1: Identifying Helicoil Thread Inserts

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 Helicoil thread insert

Fig 3: Creating Thread For Helicoil Thread Insert
Courtesy of BMW OF NORTH AMERICA, INC.

Pick out Helicoil thread insert in accordance with the chart and screw into the locating thread until flush with the original thread

Screw connection	Vehicle	Bolting point(s)	Helicoil thread insert
Front axle support to engine support	R50, R52, R53,	All	M12x1.5x18
Front axle support to engine support	R55, R56, R57, R58, R60	All	M12x1.5x18
Bracket, wishbone, to engine support	R50, R52, R53	All	M10x15
Bracket, wishbone, to engine support	R55, R56, R57, R58, R60	All	M10x15
Bracket, wishbone, to front axle support	R55, R56, R57, R58, R60	All	M14x1.5x21
Rear axle support to side member/cross member	R50, R52, R53,	All	M12x1.5x18
Rear axle support to side member/cross member	R55, R56, R57, R58, R60	All	M12x1.5x18
Bearing support, trailing arm to side member	R50, R52, R53,	All	M12x1.5x18
Bearing support, trailing arm to side member	R55, R56, R57, R58, R60	All	M12x1.5x18

Fig 4: Installing Helicoil Thread Insert

Courtesy of BMW OF NORTH AMERICA, INC.

Break drive pin and remove

Fig 5: Removing Drive Pin
Courtesy of BMW OF NORTH AMERICA, INC.