with a small curved rod as shown in
(e) Inspect the crankshaft journals for
of overheating. If crankshaft has
been overheated (usually indicated
by discolored or blue bearing journal
surfaces) or is scored or excessively
worn, reconditioning or replacement
will be required.
bearing journals for cracks if
overheating has occurred.
(f) Inspect each main bearing shell as
described in paragraph c above.
(2) Main bearing installation with engine
(a) Install all main bearings, except the
center main, as follows: Lubricate a
bearing shell with clean oil and roll it
around the crankshaft journal and
into position in the cylinder block.
The halves of the main bearing shells
are identical, therefore they may be
installed in either the upper or lower
(b) Install a bearing shell in position on
the dowel pin in the bearing cap.
Lubricate the bearing shell and
place the bearing cap in position on
the cylinder block. Install the cap
retaining capscrews and washers;
tighten the capscrews evenly to the
The main bearing caps are numbered
1, 2, 3, etc.
Figure 95. Removing main bearing upper shells.
flanges on the dowel pins in the
center main bearing cap, with the oil
(c) Lubricate and install the upper half
grooved side of flanges to the
of center main bearing shell. Install
outside of bearing cap. Lubricate
the upper halves of the thrust
and place bearing cap in position on
flanges (flanges without dowel pin
cylinder block with the number
holes) with oil grooved side of
facing the camshaft side. Install
cap retaining capscrews and
crankshaft. Install a bearing shell in
position on the dowel pin in the
center main bearing cap. Install the
lower halves of the thrust