(1) Install the upper main bearing shells (18, 6, and 5, fig. 82) in their proper places in the crankcase.
(2) Install the crankshaft (19).
(3) Install the lower main bearing shells (18, 6, and 5) in the main bearing caps (35, 36, 45, and 47). Never
replace only half of a bearing shell. Replacement must be made in complete bearing shell units. Because
of the extremely close machining of this bearing shell, no fitting, filing, scraping, boring, or other adjustment
is required or permissible.
Note. Do not try to fit the bearing by scraping or filing the shell or main bearing cap.
(4) Make sure that the bearing seat surfaces and the back of the bearing are perfectly clean. The slightest
trace of dirt or carbon squeezed between the back of the bearing and its seat can cause rapid bearing
failure due to a localized high spot.
(5) Install the lower main bearing shells (18, 6, and 5) in the main bearing caps (35, 36, 45, and 47). Install the
main bearing caps.
(6) Install the main bearing cap lockwashers (41) and screws (42 and 44).
(7) Pull down on all screws (42 and 44) evenly, going from one side of the bearing to the other. Apply final
tension with a torque wrench, using a slow, steady pull and holding the wrench on torque for a few seconds
when 20 to 25 foot-pounds' pressure is reached.
(8) Thread the lock wires (34 and 43) through the holes in the cap screw heads (42 and 44) and secure them
with pliers. See that the lock wires are tight.
(9) Use a screwdriver and a feeler gage to check the crankshaft end play. Insert the screwdriver (1, fig. 91)
between the crankshaft (2) and crankcase (3) and force the crankshaft fully to one side or the other. The
correct crankshaft end play is 0.006 to 0.004 inch. This check is illustrated in figure 91.
(10) Attach the flywheel housing (29, fig. 48) to the engine block (21) and tighten the mounting screws (31 and
(11) Install the oil pump.
(12) Connect the connecting rods with the crankshaft (par. 178).
(14) Install the oil seal (28) in the timing gear cover (2, fig. 89).
(15) Install the timing gear cover (2).