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correct clearance. Rotate the crankshaft only 1/4
to 1/2 revolution. If no drag is felt and the crank-
shaft can be rotated freely by hand, an undersize
bed ring shell should be installed, Figure 16.
FIGURE 16
Ma in bearings are available in .001", .002",
.010" and .012" undersizes. Bearing upper and
lower halves are interchangeable. Bearing she are
ink stamped on the back with the part number.
Bearings should be replaced in pairs; never use a
new bearing half with an old bearing half.
Main bearing insert sizes, crankshaft and cap
bores are shown in the following table:
MAIN BEARING, CRANKSHAFT
AND CAP BORE DIAMETERS
SHELL
BEARING
THICK-
SIZE
NESS
.0955"
Standard
.0952"
.0960"
.001" U. S.
.0957"
.0965"
.002" U. S.
.0962"
.1005"
.010" U. S.
.1002"
.1015"
.012" U. S.
.1012"
Main bearing upper halves can be removed
and replaced without removing the crankshaft
from the engine. Use tool KMO-734 Bearing
Shell Remover and Replacer, Figure 17. En ter
tool in crankshaft oil hole with hinged head
against the bearing end. Bearing shells are held in
position by an extruded end end fitting into a
CRANK-
CAP
SHAFT
BORE
DIA.
DIA.
2.4998"
2.692"
2.4988"
2.691"
2.4998"
2.692"
2.4988"
2.691"
2.4978"
2.692"
2.4973"
2.691"
2.4898"
2.692"
2.4893"
2.691"
2.4878"
2.692"
2.4873"
2.691"
machined notch at one end of the main bearing
caps and bores. Place the tool at the end of the up-
per bearing insert opposite the notch and rotate the
crankshaft in a clockwise direction to remove.
Turn in a counter-clockwise direction to install
new bearing upper halves.
FIGURE 17
REAR BEARING OIL SEAL
1. Remove old seals from crankcase and rear bearing
caps and thoroughly clean grooves and flanges.
2. Using a new seal coat lips of seal and groove
with liquid soap and press seal over flange in
crankcase and bearing cap.
NOTE: Both halves of seal are identical and
must be pressed in place so that bottom of
groove i n seal contacts the bearing cap and
crankcase flange all around: Edges of upper
and lower seals may project slightly beyond
parting line of cap and crankcase.
CRANKSHAFT INSTALLATION
1. Remove the rags from cylinder bores, oil bores,
clean pistons, rings and connecting rods and
install in block.
2. Place crankshaft in main bearings and install
main bearings and bearing caps.
Tighten bearing cap bolts to 70-80 ft. lbs.
After installation of new main bearing shells,
crankshaft end play must be checked. The shaft
thrust limits are .003" to .009".
End play can be determined by using a
dial indicator.
Move the crankshaft in one direction until the
shaft thrust surface contacts against the bearing
thrust surface as outlined above.
ENGINE 36
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