Connecting Rod 1.6.1
DETROIT DIESEL 53
check for piston pin end clearance by cocking the
to .0019" with a new piston pin. A new piston pin
connecting rod and shifting the pin in its bushings.
has a diameter of 1.3746" to 1.3750".
6. One important function of the piston pin retainer is
to prevent the oil, which cools the underside of the
Assemble Connecting Rod to Piston
piston and lubricates the piston pin bushings, from
reaching the cylinder walls. Check the retainers for
Apply clean engine oil to the piston pin and bushings.
proper sealing as follows:
Refer to Fig. 2 and assemble the connecting rod to the
piston as follows:
a. Place the piston and connecting rod assembly
upside down on a bench.
1. Place the piston in the holding fixture (Fig. 9).
b. Pour clean fuel oil in the piston to a level above
the piston pin bosses.
2. Place a new piston pin retainer in position. Then
place the crowned end of installer J 23762 against the
c. Dry the external surfaces of the piston in the area
retainer and strike the tool just hard enough to deflect
around the retainers and allow the fuel oil to set for
the retainer and seat it evenly in the piston.
about fifteen minutes.
CAUTION: Do not drive the retainer in too far
d. Check for seepage of fuel oil around the retainers.
or the piston bushing may be moved inward
If the fuel oil leaks around the retainers, install new
and result in reduced piston pin end clearance.
retainers. In extreme cases, it may be necessary to
replace the piston.
3. Place the upper end of the connecting rod between
the piston pin bosses and in line with the piston pin
e. After the leakage test is completed, empty the fuel
holes. Then slide the piston pin in place. If the piston
oil from the piston, dry the parts with compressed air
pin-to-bushing clearances are within the specified
and lubricate the piston pin with clean engine oil.
limits, the pin will slip into place without use of force.
7. Install the piston rings on the piston as outlined in
4. Install the second piston pin retainer as outlined in
Section 1.6.
Steps 1 and 2.
8. Install the piston and connecting rod assembly in
the engine as outlined in Section 1.6.3.
5. After the piston pin retainers have been installed,
SEC. 1.6.1 Page 5
April. 1974