Making Ground Connection Using A Through Bolt

Courtesy of PORSCHE CARS NORTH AMERICA, INC.

Diagram

1. Drill a hole > Diameter 4 mm 

   Courtesy of PORSCHE CARS NORTH AMERICA, INC.

   Drilling hole

2. Remove dirt and primer on both sides using an end brush > 9399/3 - end brush  .

   Courtesy of PORSCHE CARS NORTH AMERICA, INC.

   Removing primer

3. Drill out the bore > Diameter 8 mm 

   Courtesy of PORSCHE CARS NORTH AMERICA, INC.

   Drilling out bore

4. De-burr the bore on both sides.
5. Fit countersunk screw through the bore and secure it with a hexagon nut > COUNTERSUNK SCREW 999.073.549.01  > HEXAGON NUT 900.377.003.01 
6. Tighten threaded joint to the specified torque > Tightening torque 15 Nm (11 ftlb.) 
7. Seal threaded joint.