When using the following method of bearing
removal, remove only one main bearing cap
at a time, complete inspection and install the
bearing shells and cap before removal of the
next bearing cap.
(2) Remove engine (para 2-5).
(3) Remove the oil pan (para 3-26).
(4) Remove the oil inlet tube and screen (para
(5) Two methods of removal are required, one for
the front and intermediate bearings and a second
method for the rear main bearing.
(6) Remove, one at a time, the front and inter-
mediate bearing shells as follows:
their original positions. Main bearing thrust washers
absorb the crankshaft thrust at each side of the rear
main bearing. Each washer is made up of two halves,
the lower halves are doweled to the bearing cap. The
upper and lower bearing shells are not interchange-
able; the upper bearing shells are grooved, and the low-
er shells are not. If one bearing shell is to be replaced,
all main bearings shells must be replaced.
b. Removal of Main Bearings with Crankshaft In-
(1) If removal of the crankshaft is not required
the bearing shells may be removed in the following
(a) Remove main bearing cap (fig. 3-129) and
remove lower bearing shell (3, fig. 3-130).
(b) Insert a special bolt (standard 1/4 by 3/4-inch
long, with head ground to a thickness of 1/16 inch) into
crankshaft journal oil hole so that the bolt head does
not extend beyond the outer surface of the upper bear-
ing shell. Rotate the crankshaft in a clockwise direc-
tion and roll the upper bearing shell (12) out of the
(c) Clean, inspect and install main bearings and
repeat procedures for each intermediate bearing.
(7) Remove the rear main bearing shells as fol-