Hudson 1953 Super Jet, Mechanical Procedure Manual

Page: 38 / 156

NOTE: New bearing inserts should be in-
stalled only in pairs. Never file bearing caps to
provide proper clearance when installing new
bearings.
Before installing new connecting rod bear-
ings, the crankpin journals should be checked for
wear, out of round and taper. Crankpin out of
round should not exceed .0015" and taper no
more than .001". Measure journals vertically and
horizontally with a micrometer and check at both
ends for taper.
Diametral clearance of the connecting rod
bearing should be .0005" to .0015" and the rod
end play .007" to .013". The clearance can be
checked either by the plastigage or shim method.
PLASTIGAGE METHOD
1. Remove the bearing caps one at a time and
insert a length of plastigage slightly shorter
than the cap width.
2. Install the bearing cap with a new standard
insert and tighten to 40 to 45 foot pounds
torque. Do not rotate the crank-shaft while the
plastigage is in place.
3. Remove the bearing cap and check the width
of the flattened plastigage. If the width is not
over .00225", a standard bearing should be
installed.
SHIM METHOD
1. Place brass shim stock .0015" thick, 1/2" wide
by 7/8" long in the bearing cap with a new
standard bearing in place.
2. Tighten the bearing cap to 40 to 45 foot pounds
torque.
3. Try to move the rod endwise by hand, then tap
lightly with a hammer. If the rod will not move by
hand, but moved when tapped with the hammer, a
standard bearing should be used. If the rod can be
moved by hand, install an undersize bearing.
Bearing shell thickness, crankpin diameters and
connecting rod bores are given for standard and vari-
ous undersize bearings.
CONNECTING ROD BEARING
SIZES, CRANKPIN
DIAMETERS AND CONNECTING
ROD BORES
After tightening the connecting rod bolt nuts to
the proper torque, install Palnuts snug against the
bolt nuts. Then tighten the Pal- nuts 1/4 to 1/3 more
to lock the Palnuts in position. New Palnuts should
always be used when rods are reassembled.
CONNECTING RODS
PIN TO ROD ALIGNMENT
1. Remove connecting rod bearing shells and
mount rod on the arbor, (Figure 13).
2. Place the "V" block against the piston pin. The
amount of misalignment will be shown by the
clearance between the pins on the "V" block and
the face plate.
If the two top pins contact against the face plate
and the two bottom pins fail to contact the face
plate, the rod is cocked or bent. The same condition
exists if the bottom pins contact the face plate and
the upper pins show a clearance. When the pins in
a horizontal plane contact the face plate and the
other two do not, the connecting rod is twisted.
33 ENGINE
BEARING
SIZE
SHELL
THICK-
NESS
CRANKPIN
DIAM-
ETERS
CONNECT-
ING
ROD
BORES
Standard .0622"
.0619" 1.938"
1.937" 2.0630"
2.0625"
.0005" US .0627"
.0624" 1.9376"
1.937" 2.630"
2.0625"
.002" US .0632"
.0629 1.936"
1.935" 2.0630"
2.0625"
.010" US .0672"
.0669" 1.928"
1.927" 2.630"
2.0625"
.012" US .0682"
.0679" .1926"
.1925" 2.0630"
2.0625"