FIG. A.ll/3 CAMSHAFT REMOVED
6.
Oil pressure reducing hold;
7.
Oil circulation
groove;
8.
Oil
pump
driving gear; 10. Camshaft
driving
gear
a)
Removing the capscrews securing the cam·
shaft stop flange (Item
9)
to the crankcase.
(d)
V-belt (Item
6),
after loosening the front
bolt
of
the alternator.
(e)
Drive pulley (Item
5)
and
its
hub with a
puller
with
three
slots
at
120
o each.
(f) Fan and driven pulley.
Remove the end plate attaching capscrews (Item
c,,
Fig. A.ll/4) by
using
a suitable wrench through
the
two
holes machined in the gear
for
this
pur·
pose (Fig. A.ll/3). Once these operations have
been completed, and before withdrawing the
camshaft and gear unit, secure
lifters
in place
to
prevent the
tappets
from falling
into
the oil
sump. Remove
the
gear from shaft end using a
press, as the gear
is
assembled
to
a shrink
fit
following
immersion
in hot
oil
at 356°F. (180°C.)
REPLACING THE CAMSHAFT BEARINGS
In case
of
bearing replacement, we recommend
the
following
sequence:
1.
Remove
the
oil
sump and
timing
gear case,
if
necessary
to
ease the job.
2.
Use a
bushing
puller
on the front bearing
(Fig. A.ll/6) and the same puller
with
exten-
sion
for
the
intermediate one.
3.
Remove
the
rear crankcase mount.
4.
Drive
out
the
expansion plug located at the
rear sleeve bearing using a suitable bar
through
the
crankcase.
FIG. A.ll/4 SECTIONAL VIEW OF THE CAM·
SHAFT DRIVE
Ca.
Cap screws securing the gear
(1
0)
and cam·
shaft
assembly
to
the crankcase;
9.
Stop flange;
10. Driving gear
5.
Remove the rear bearing
with
the same
pullers used on front and intermediate ones.
At installation, be sure to:
1.
Measure each bushing
to
be
sure they go in·
to
the proper bore.
(See
Fig. A.ll/5).
2.
Arrange
bushings
so that lube passages are
aligned
with
the
matching
passage in the
crankcase.
3.
Drive in the intermediate bushing
with
a
bushing installation tool.
4.
Use a bushing installation tool
for
the front
and rear bushings.
5.
Line bore the bushing with a reamer
to
the
,diameter specified in Fig.•A.II/5.
6.
When
fitting
the camshaft rearmost bearing,
be sure
to
see
if
this
is in the
modified
ver-
sion; i.e.,
with
curved uppermost surface so
to
shield the expansion cup on the crankcase
from the outside;
if
otherwise,
fit
a rubber
plug with replacement inside the cup,
to
avoid ingress
of
oil in the
clutch
compart-
ment.
CAMSHAFT AND BEARING CHECKS
Measure journal and bearing wear and check ser-
vice clearance (see table
of
data). Sleeve bear-
ings are not available
with
undersized bores;
if
necessary, replace both bearings and camshaft.
Check journal alignment
to
make sure the cam-
shaft is perfectly straight.
Engine·
16
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