1. Front main bearing cap
3. Center main bearing cap
2. Intermediate main bearing caps
4. Rear main bearing cap
Make certain the backs of bearing shells are
free from dirt and grit particles.
(2) Lubricate all crankshaft main bearing jour-
nals with engine oil; lower the crankshaft into position
in the cylinder block with flywheel flange end of crank-
shaft toward the rear.
Make certain that timing mark on crankshaft
gear is aligned with timing mark on camshaft
gear, when crankshaft is installed.
(3) Place the lower halves of the main bearing
shells in position in the main bearing caps.
Make certain the backs of the bearing shells
are free from dirt and grit particles.
(4) The bearing caps are numbered 1,2,3, etc.
indicating their respective positions. Before instal-
ling center main bearing cap, insert upper thrust
flanges (flanges without dowel pin holes) with oil
grooves of thrust flanges located next to cheeks of
the crankshaft. Position lower thrust flanges on
dowel pins, with the oil grooves in the thrust flanges
to the outside of the bearing cap.
(5) Install main bearing caps with numbers
facing camshaft side of the engine and corresponding
to number stamped on lower edge of cylinder block
as shown in figure 14-45. Install the main bearing
cap attaching lock bolts snugly. Force crankshaft
in both directions to align the bearing caps with the
upper portion of the main bearing bores.
(6) Using a torque-indicating wrench, tighten
the main bearing cap lock bolts to a torque of 170 to
Do not overtighten main bearing lock bolts.
If these lock bolts are overtightened, bear-
ing caps may be distorted, causing bearing
to be drawn tight against the crankshaft and
premature failure will result. The crank-
shaft should turn freely after all capscrews
are properly torqued. Never file or shim
a bearing cap to make the bearings shell fit;
install new bearing shells if fit on the
crankshaft is unsatisfactory.