1948-1952 Shop Service Manual - - Hudson-Essex-Terraplane Club

ENGINE 3 - 25
The connecting rod bearing does not lend itself to adjustment.
DO NOT FILE bearing caps to take up radial clearance.
CONNECTING RODS
(6 Cylinder)
FIGURE 29
CONNECTING RODS
(8 Cylinder)
The connecting rods have steel side thrust faces. A lead
tin alloy bearing metal is used to line the connecting rods
and the bearing lining thickness is .015.
The radial clearance at the connecting rod big end is .001
and the end clearance is .007 to .013.
Connecting rods are right and left hand; the crankshaft
end being offset on the rod proper.
8 cylinder engines.
Connecting Rods 1-3-5-7 are
Right Hand.
Connecting Rods 2-4-6-8 are
Left Hand.
EIGHT CYLINDER ROD BEARING
CLEARANCE, CRANKPIN DIAMETER AND
FINISHED BORE DIAMETER
Bearings
Diametrical
Clearance
No. 1 thru No. 8 .0003
.0006
Crankpin
Diameters
1.935
1.9353
CONNECTING ROD BEARING
.010 Undersize
No. 1 thru No. 8 .0003
.0006
1.935
1.9353
Finished
Bore
1.9353
1.9359
1.9353
1.9359
Connecting rods are heat treated, drop-forged steel
with an I-beam section. An oil metering hole is provided
in the upper half of the connecting rod bearing to
provide additional cylinder wall lubrication. This oil
metering hole indexes with the hole drilled in the
crankshaft as the piston approaches top dead center on
each piston stroke, thereby spraying the exposed cylinder
wall with an additional supply of oil.
Connecting rods have steel-backed babbitt lined
bearings, interchangeable on all rods upper and lower,
and are held in position by extensions stamped in edge
of bearing shell and located in machined notches in cap
and rod.
Replacement bearings require no reaming or fitting.
Connecting rods are interchangeable in the 6 cylinder
engine, 1 through 6.
When replacing with new rods, weight should not
vary 1/4 oz. in any one group of rods.
SIX CYLINDER
CONNECTING ROD BEARING SIZES,
CRANKPIN DIAMETERS AND BORE
BEARING SHELL CRANKPIN
SIZE THICKNESS DIAMETERS BORE
Standard .0622 2.1254 2.2505
.0619 2.1244 2.2500
.0005 U.S. .0627 2.1250 2.2505
.0624 2.1240 2.2500
.002 U.S. .0632 2.1234 2.2505
.0629 2.1229 2.2500
.010 U.S. .0672 2.1154 2.2505
.0669 2.1149 2.2500
.012 U.S. .0682 2.1134 2.2505
.0679 2.1129 2.2500