BMI Racing DB12RR - Manual (Page 4)

Step 6
Attach the upper
suspension arm assembly
to the lower suspension
arms as shown with 4-40 x
½” screws.
Locate the left and right steering spindles. Trim the
steering arms length to the line molded on the part as
shown.
Step 7
Step 8
Locate the Ti front axles, four 4-40 alloy lock nuts,
and two alloy pivot balls.
Thread the Ti axles into the steering spindles.
Note that the threads on the axles that go into the
spindles are left hand. After the axles are fully
seated tighten an alloy 4-40 lock nut onto the
threaded stub coming out the back of the spindle.
Thread the alloy pivot balls into the holes on the
steering arms and secure them with alloy 4-40 lock
nuts. Remember these are alloy pivot balls so
make the nuts snug. They are strong enough to
last a few racing seasons; but if you crank them
down, you can snap them.
Step 9
1. Snap an e-clip on to one end of the king pin.
2. Slide 3 shims onto the king pins against the
e-clip.
3. Pass this through the pivot ball in the upper
suspension arms rod end.
4. Place one more shim on the king pin.
5. Slide the steering spindle onto the king pin.
6. Slide the king pin through the pivot ball in the
lower suspension arm.
7. Slide the .020” spring and nylon retainer
onto the king pin and snap an e-clip on the
bottom of the king pin.
8. Repeat for the other side of the front
suspension.
Locate 2 steel 1/8” king pins,10 1/8” shims, 4 e-
clips and 2 .020” springs.
Special notes:
Make sure the steering arms on the spindle
are pointing towards the rear of the car as
shown in the picture.
The axle is offset in the spindle. Make sure
the axle is closest to the lower suspension
arm. As shown in the picture to the left
It is important that the king pin slide freely in
all of the parts including the steering
spindle. When you thread the axle into the
spindle, it may swell the king pin bore and
make it tight on the spindle. You can try to
use a 1/8” drill to open it up but the best
solution is to use a 1/8” reamer.
You can order the reamer from:
www.mcmaster.com . The part number is
2995A61