1.6.1
DETROIT DIESEL 53
C O N N E C T I N G ROD
bolts. nuts. spray nozzle (if used orifice and the
Each connecting rod (figs. 1 and 2) is forged to an
piston pin hushing pressed in place and bored to size
"I" section with a closed hub at the upper end and a
bearing cup at the lower end The connecting rod is
The replaceable connecting rod bearing are
drilled to provide lubrication to the piston pin at the
covered in Section 1.6.2.
upper end and is equipped with a nozzle to spray
cooling oil to the underside of the piston head on
engines equipped with an oil cooler. Engines that are
Disassemble Connecting Rod from Piston
not equipped with an oil cooler do not use nozzle type
connecting rods. An orifice is pressed into a
With the rod and piston assembly removed from the
counterbore at the lower end of the oil passage (in
engine, disassemble the piston and connecting rod as
rods equipped with a spray nozzle) to meter the flow
outlined in Section 1.6.
of oil.
NOTE: Never intermix nozzle type connecting
rods in a n engine with non-nozzle type
connecting rods.
A helically-grooved hushing is pressed into each side
of the connecting rod at the upper end. The cavity
between the inner ends of these bushings registers
with the drilled oil passage in the connecting rod and
forms a duct around the piston pin. Oil entering this
cavity lubricates the piston pin bushings and is then
forced out the spray nozzle to cool the piston. The
piston pin floats in the bushings of both the piston and
the connecting rod
A service connecting rod includes the hearing cap.
Fig. 2 Connecting Rod Details and Relative
Location of Parts
Fig. 1 Connecting Rod Mounting
SEC. 1.6.1 Page 1
April. 1974
