BBC / BOS / BCS
They are noise dampeners. Without them, when the
brake pad hits the drum, the drum will ring like a bell.
Also look at the two blade mounting bolts. Each has
a flat side on the head to prevent them from rotating
when the nut is tightened (Fig. 196). Make sure the
bolts are fully seated. Install the brake drum.
CAUTION! The two bumps on the pulley MUST
engage the flywheel. If you do not have an
impact wrench, this is where the two bumps
become important. If you engage the bumps on
the pulley into the flywheel, you can now wedge
the flywheel and through the pulley and key, it
will hold the crankshaft from rotating while you
tighten the nut (Fig. 197).
Fig 196
3428-0189
Fig 197
3428-0187
4.
5.
Inspect the hub assembly if the old one is to be
reused. Rust on the outside is harmless. But the
seals in the bearing need to be intact. If the seals
are damaged or the bearing feels rough when it is
turned, replace the hub assembly.
6. Slip the BBC belt over the parts on the crankshaft.
7. Check the shaft of the idler/brake arm. Clean as
necessary and apply a light coat of grease.
Start the nut on the crankshaft. As during
disassembly, an impact wrench works best.
6-26
WPM Drive Systems Manual
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