CRANKSHAFT
Clean
crankshaft thoroughly
and
inspect journals
for
scoring, chipping, cracking, or signs
of
overheating.
If
crankshaft has overheated, is scored, or excessively
worn, reconditioning
or
replacement will be required.
Examine bearing journals for cracks
if
overheating has
occurred.
L
I
Measure crankshaft main bearing and connecting rod
journals at several places on their diameter to check for
roundness and taper.
The only recommended method of reconditioning the
crankshaft
is
regrinding, as required to accommodate
undersize bearings. Metallizing
of
bearing journals is
not recommended.
If
regrinding of crankshaft journals is necessary, the
work should be done by a reputable machine shop that
has suitable equipment to handle precision work
of
this
type. Undersize main bearings are available in sizes of
0.01
0,
0.020,
and
0.030
inch. Undersize connecting
rods are available in sizes of
0.010,
0.020,
0.030
and
0.040
inch.
Whenever making major repairs on the engine, always
inspect the drilled passages
of
the crankshaft. Clean
them to remove any foreign material and
to
assure
proper lubrication
of
the connecting rods.
BEARINGS
With camshaft and crankshaft removed, use a micro-
meter
to
measure diameter
of
bearing journals. Use a
dial bore gauge
or
a telescopic gauge and micrometer
to measure inside diameter of bearings. Refer to
DIMENSIONS AND CLEARANCES
to determine
if
clearances are within specifications.
Any bearing that is scored, chipped, pitted or worn
beyond the specified limits must be replaced.
Removal
of
the camshaft bearings requires complete
disassembly of the engine. Use a press or a suitable
driver to remove bearings.
Support casting to avoid
distortion and to avoid damaging the bearing bore
during removal and installation.
C
7/32'
(5.6
mm)
FROM
OUTSIDE
ALIGN
HOLE IN
BEARING
-------------
IN
BEARING BORE
CAWSHAFT BEARING
FIGURE
20.
FRONT
CAMSHAFT
BEARING
Replacement camshaft bearings are precision type
which do not require line reaming or line boring after
installation. Clean outside of the bearing and bearing
bore in the block. Before installing cam bearings use
Locktite Bearing Mount on outside diameter of bearing.
Use a combination bearing driver to install bearings.
Place the bearing on the crankcase over the bearing
bore with the lubricating hole (front only) in the proper
position. Be sure to start the bearing straight. Press in
the front bearing flush with the outside end of the
bearing bore. Front cam bearing oil hole must line up
with oiling hole in cylinder block (Figure
20).
Press in
the rear camshaft bearing until past the ignition plunger
hole. Lubricate bearing surfaces with oil after installing.
New crankshaft main bearings are precision type which
do
not
require line reaming or line boring after installa-
tion. Usea press ora suitable driverto remove bearings.
Support casting to avoid distortion and to avoid dam-
aging the bearing bore during removal and installation.
Before installing main bearings, expand bearing bore by
placing the casting in an oven heated to 200°F
(94OC).
If
practical, cool the precision bearing to shrink
it.
Before installing the front main bearing, usethe towelette
included with the bearing kit to clean the outside of the
bearing and bearing bore in the block.
Breathing
vapor
from
fowelefte
and
prolonged confacf with
skin
can be
harmful. Use only in well ventilated area and avoid
prolonged contact
with
skin.
10-13
Redistribution or publication of this document,
by any means, is strictly prohibited.
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