Service Manual

8-26
WPM Drive Systems Manual
BBC/BOS/BCS
 CAUTION! ThetwobumpsonthepulleyMUST
engagetheywheel.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ywheel,youcannowwedge
theywheelandthroughthepulleyandkey,it
willholdthecrankshaftfromrotatingwhileyou
tightenthenut(Fig.230).
4. 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.
5. Start the nut on the crankshaft. As during
disassembly, an impact wrench works best.
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.
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 at side on the head to prevent them from rotating
when the nut is tightened (Fig. 229). Make sure the
bolts are fully seated. Install the brake drum.
Fig229 3428-0189
Fig230 3428-0187