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.
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. Metalizing 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 and connecting rods are
available.
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, measure all
bearing journal diameters. Measure inside diameter of
bearings. Refer
to
DIMENSIONS AND CLEARANCES
to
determine
if
measurements are within specifications.
Visually inspect bearings and journals. Replace any
bearing that
is
scored, chipped, pitted or worn beyond
specifications.
Camshaft Bearings
Replacement camshaft bearings are precision type
which do not require line reaming
or
line boring after
installation. 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.
Clean. outside of bearing and bearing bore in the block.
Before installing bearings use Locktite
Bearing
Mount
on outside diameter of bearing. Use a combination
bearing driver
to
install bearings.
Place the top camshaft bearing on the crankcase over
the bearing bore with the lubricating hole lined up with
the hole in block (Figure
19).
Be sure to
start
the bearing
straight. Press in the top bearing flush with the outside
end of the bearing bore. Lubricating hole in the bearing
must be aligned with the hole in the block after
installation.
ALIGN HOLE
IN
BEARING
WITH
HOLE
IN
BEARING BORE OUTSIDE
OF
BLOCK
TOP
CAMSHAFT
BEARING
BEARING
PRESS
BEARING IN
\
(1
2.7
mm)
I
OUTSIDE
OF
BLOCK
BOTTOM
CAMSHAFT
BEARING
CT-1094
FIGURE
19.
CAMSHAFT
BEARINGS
Press in the bottom camshaft bearing to the dimension
shown (Figure
19).
Lubricate bearing surfaces with oil
after installing.
Crankshaft
Bearings
New crankshaft main bearings are precision type which
do not require line reaming or line boring after
installation. 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.
Inspect the top and bottom main bearing lock pins for
damage. Replace
if
necessary,
Before installing main bearings expand bearing bores
by placing the casting in an oven heated
to
200°F
(94ºC).
Cool
the precision bearings
to
shrink them
if
possible.
10-1
3
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