ENGINES - 3A-5590-823225--1 1096
Replacement
NOTE: Main bearings may be replaced with or with-
out removing crankshaft.
72359
b
c
a
Main Bearing Inserts
a - Lower Bearing Insert (Install in Cap)
b - Upper Bearing Insert (Install in Black)
c - Oil Groove
WITH CRANKSHAFT REMOVED
1. Remove and inspect the crankshaft as outlined.
2. Remove the main bearings from the cylinder
block and main bearing caps.
3. Coat bearing surfaces of new, correct size, main
bearings with oil and install in the cylinder block
and main bearing caps.
4. Install the crankshaft.
WITHOUT CRANKSHAFT REMOVED
1. With oil pan, oil pump and spark plugs removed,
remove cap on main bearing requiring replace-
ment and remove bearing from cap.
2. Install main bearing remover/installer in oil hole
in crankshaft journal. If such a tool is not
available, a cotter pin may be bent, as shown, to
do the job.
72622
a - Main Bearing Remover/Installer (J-8080)
b - Cotter Pin
a
b
3. Rotate the crankshaft clockwise as viewed from
the front of engine. This will roll upper bearing out
of block.
4. Oil new selected size upper bearing and insert
plain (unnotched) end between crankshaft and
indented or notched side of block. Rotate the
bearing into place and remove tool from oil hole
in crankshaft journal.
5. Oil new lower bearing and install in bearing cap.
6. Install main bearing cap with arrows pointing to-
ward front of engine.
7. Torque all main bearing caps, EXCEPT THE
REAR MAIN CAP, to 80 lb. ft. (109 N·m). Torque
rear main bearing cap to 10-12 lb. ft. (14-16
N·m); then tap end of crankshaft, first rearward
then forward with a lead hammer. This will line up
rear main bearing and crankshaft thrust sur-
faces. Torque rear main bearing cap to 80 lb. ft.
(109 N·m).
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