After torquing bolts to 45-55 lb-ft (61-
75 Nm) put a pencil line opposite the
first mark on the socket. Then rotate
the bolt until the next socket mark
lines up with the pencil line.
Fig. 9 - Main Bearing Cap Marking
when the bearing is in place, the tang will fit into the
groove in the bearing support.
2. Install the lower main bearing shell so that the tang
on the bearing fits into the groove in the bearing cap.
3. Assemble the crankshaft thrust washers (Fig. 8)
Fig. 10 - Main Bearing Cap Bolt Turn Torque
before installing the rear main bearing cap. Clean both
halves of each thrust washer carefully and remove
Strike both ends of the crankshaft two or three sharp
any burrs from the washer seats -- the slightest burr or
blows with a soft hammer to insure proper positioning of
particle of dirt may decrease the clearance between the
the rear main bearing cap in the block saddle. Turn the
washers and the crankshaft beyond the specified limit.
rear main bearing cap bolts an addition 110 °-130 ° of
Slide the upper halves of the thrust washers into place.
bolt head rotation.
Then assemble the lower halves over the dowel pins in
the bearing cap.
properly, the crankshaft will turn
The main bearing caps are bored in
freely with all of the main bearing
position and stamped 1, 2, 3, etc.
cap bolts drawn to the specified
(Fig. 9). They must be installed in
their original positions with the
5. Check the crankshaft end play as outlined under
marked side of each cap toward the
blower side of the cylinder block.
6. Install the lubricating oil pump and the oil inlet and
4. With the lower main hearing shells installed in the
outlet pipe assemblies.
bearing caps, apply a small quantity of International
Compound No. 2, or equivalent, to the bolt threads and
If shims were used between the
the bolt head contact area. Install the bearing caps and
pump and the bearing caps, install
draw the bolts up snug. Then rap the caps sharply with
them in their original positions.
a soft hammer to seat them properly and tighten all bolts
Then check the oil pump gear
to 45-55 lb-ft (61-75 Nm) torque. Turn all bolts (except
the rear main bearing bolts) an additional 110°-130° of
clearance (Page 10.5-10).
7. Install the oil pan, using a new gasket.
bolt head rotation starting with the center bearing cap
8. Fill the crankcase to the proper level on the dipstick
bolts and working alternately towards both ends of the
with heavy-duty lubricating oil of the recommended
grade and viscosity (refer to Lubricating Oil
An accurate way to determine bolt
9. After installing new bearing shells, operate the
head rotation is to paint or
permanently scribe the sockets used
with two marks 120° apart (Fig. 10).