How To Rebuild Your Ford V-8 351C-351M-400-429-460.pdf - Index of

them; they'll tell you a story. Bearing
inserts are made from plated copperlead
alloy or lead-based babbit, both
on a steel backing or shell. If your
engine has a lot of accessories such as
power steering and air conditioning,
the front top bearing should be worn
more than the other bearings due to
the higher vertical load imposed on the
crankshaft and bearing by the drive
belts. This wear is normal because of
the way the crankshaft is loaded and
should not be a cause for any concern.
For the same reason, wear may also
show up on the bottom of the center
bearings, particularly at the second
and third journals. If the bearings are I
copper-lead type, a copper color will
show evenly through the tin plating.
This makes it easy to distinguish wear
because of the contrasting colors of
the tin and copper. As for the leadbase
bearings, it's more difficult to
distinguish wear because of the similar
colors of the bearing and backing.
You should be concerned about
uneven wear from front-to-back on the
total circumference of the bearing
(top and bottom), scratches in the
bearing surface and a wiped bearing
surface. The first condition indicates
the bearing journal is tapered, its diameter
is not constant from one end to
the other, causing uneven bearing and
journal loading and uneven wear.
Scratches in the bearing surface mean
foreign material in the oil passed between
the bearing and crankshaft
journal. ~h~ usual cause of this is
dirty oil and an oil filter which clogged, 1
1 resulting in the filter being bypassed
and the oii going through the engine
unfiltered. A wiped bearing surface is
usually caused by the journal not receiving
adequate lubrication. This can
be caused by periodic loss of oil pressure
from a low oil level in the crankcase,
a clogged oil passage or a malfunctioning
oil pump. All these things have
to be checked and remedied when the
problem is found. Also, any problem
, you may find with the bearings means
there may be damage to the crankshaft.
Consequently you should pay particular
attention to the crank journals
which had bearing damage to see if
there is corresponding damage to the
crank.
Flex your muscles and llft the crankshaft straight up out of block. Front end is easy to lift,
but you'll have to stick a couple of flngers in the rear of the crank to lift that end. Llke
most, this crankshaft is in good shape even though the engine has had a rough Ilfe.
Before removing the cam, its thrust plate will have to come off. Using cam drive sprocket
loosely installed, raise lifters in their bores by rotating cam through at least one revolution.
If any lobes are excessively worn, or you have a 429 or 460, you'll have to force them
even higher to keep the lifters from interfering with bearing journals as you slide cam out.
, If you plan on saving the cam bearings, be careful not to bump them with the camshaft
while you're removing it. Use sprocket as a handle to help control camshaft movement.
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