The hubs you have received have a five-lug bolt
pattern of YOUR choice. Before installation,
your drums must also be drilled with the same pattern. You have three choices: 1) Ship them to us and we will drill them for
$25 per hub plus shipping. 2) Have them
drilled by a local machine shop, 3) Follow the steps below and do it yourself. You will need a Wilson Welding drill bushing
bolt guide ($5.95 plus $3.00 packing, shipping), a good drill press (not a hand
held drill), a ¼ inch, 3/8 inch and ½ inch drill bits.
DO IT
YOURSELF DRILLING YOUR DRUMS
Step 1 – Remove the Buick hub from the finned Buick drum.
Step 2 – Lay the drum, outer side up, on a flat
surface. Temporarily insert fully the
new hub, small bearing hole upward, into the hole of the Buick drum. Hand thread the drill bushing bolt into any
one of the threaded holes of the new hub until it lightly touches the drum
surface. Locate the hub in the drum to
insure maximum distance from the already existing stock holes present in the
drum. Drill a single ¼ inch hole in the
drum using the drill-bushing bolt as a guide.
This needs to be done with a drill press, not a hand held drill.
Step 3 – Remove bolt from the hub. Remove the hub from the drum. Again, using a good drill press, enlarge the
¼ inch hole to ½ inch. Step drilling is
the best approach. Graduate from ¼ to
3/8 to ½ inch.
Step 4 – Reinsert the hub into the drum as before and
insert a ½-20 X 1 ½ inch grade 8 bolt from the inside
of the drum, through the drum, into one of the threaded hub holes. Tighten lightly. This grade 8 bolt will stabilize the hub in
the drum and will allow you to drill the last four holes into the drum. One at a time, insert the drill-bushing bolt
into each of the four remaining drilled holes in the hub and drill a ¼ inch
hole.
Step 5 – Remove the grade 8 bolt. Remove the hub from the drum. Enlarge the four – ¼ inch holes to ½ inch with
your drill press. Again, step drilling
is the best approach. NEVER ATTEMPT TO
USE THE NEW HUB AS A DRILLING GUIDE WITHOUT THE DRILL BUSHING BOLT. THE ½ INCH DRILL BIT WILL RUIN THE MACHINED
THREADS IN YOUR NEW HUB.
INSTALLATION
OF THE HUB TO YOUR DRILLED DRUMS
With your drums drilled, you need five grade 8 bolts,
½-20 X 1 ½ inches long, the included round flange with five holes, your drums
and your new hubs. With the new hub on
the outside of the Buick brake drum, the five bolts are inserted from the
inside of the drum. First place the
included round flange inside the brake drum.
Insert the five bolts through the flange / through the drum surface and
threaded into the hub from the back side.
After all five bolts are threaded and tightened for the final assembly, tack weld the grade 8 bolt heads onto the flange. This is critical for your safety. If you do not secure the bolt head to the
flange, you are asking for trouble. (Be
certain that all your painting, polishing, detailing has been finished before
final welding) Grade 8 bolts MUST be
used. A grad 8 Bolt has 5 marks on the
head surface. After FINAL hub/drum
assembly, the drum brake surface must be trued on a brake lathe before
mounting. The bearing races must be
installed before the hub/drum assembly can be trued.
WHEEL
BEARING INSTALLATION
Before mounting your wheels to the drums, you have to
CORRECTLY install your bearing races, bearings and dust seals. If you think a lot is riding on your tires,
you have just as much riding on your wheel bearings. If you are not sure how to pack your
bearings, install the bearing races and know when to stop tightening the
spindle nut, have a pro do it. YOU MEAN
THE BEARINGS DO NOT COME GREASED FROM THE FACTORY ?????? To install the dust cap, place a short length
of 2 inch pipe on the outer lip of the dust cap. Hammer on the pipe, not directly on the dust
cap.
BOB WILSON:
972-539-2305 TOM
BITROS: 214-213-8064