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and diamond bored to very close tolerance.
REMOVAL AND REPLACEMENT
Press out the old bushing by supporting the
bushed end of the connecting rod on Bushi n g
Burnisher Block J-2951 and press the bushing
out, using Bushing Remover and Replacer J-
2948. Press the new bushing in place in the con-
necting rod bore. Be certain the oil hole in the
bushing is aligned with the oil hole in the con-
necting rod bore. Burnish the bushing in place,
using burnishing tool Z-2949, (Figure 11).
NOTE: This operation swages or expands the
bushing i n the rod bore. This prevents the
bushing from working out of the rod.
The bushing should b e reamed .0003" larger
than the piston pin diameter. To ream, remove the
connecting rod bearing cap and mount o n Align-
ing Fixture J-874-H Arbor (1.9375 diameter).
(Tighten rod on arbor and lock in position by
tightening the arbor lock screw located on the
side of the fixture.)
FIGURE 11
Mount the reamer pilot bushing in the face plate
bore on the upper end of the fixture and lock the
lower arbor in place with the locking handle. Insert
the reamer through the connecting rod bushing
and into the pilot bushing an d perform the ream-
ing operation, (Figure 12).
FIGURE 12
CONNECTING RODS
Connecting rods are drop forged heat treated
steel with an I-beam section. An oil metering hole
is provided in the upper half of the connecting rod
bearing to provide an oil spray for cylinder wall
lubrication. This oil metering hole indexes with the
hole drilled in t he crankshaft as the piston ap-
proaches top dead center on each piston stroke.
This sprays additional oil on the exposed cylinder
wall.
Connecting rods have steel backed babbitt lined
bearing inserts, with upper and lower halves inter-
changeable in all rods. Bearing halves are held in
position by the extruded portion of the bearing
shell fitted into notches machined in the rod and
cap.
Replacement bearings require no reaming or
fitting. Connecting rods are interchangeable.
When replacing rods, the weight of new rods
should not vary more than 1/4 ounce in any one
group of rods.
ENGINE 32
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