DETROIT DIESEL 53
BLOWER ROTOR END CLEARANCES
Front End Plate Rear End Plate
The gasket used between the blower
and the governor housing on the 6V
engine is not interchangeable with the
front end plate cover gasket.
14. Assemble the blower drive spring support as flows:
a. Place the drive spring support on two blocks of
Fig. 12. - Inserting Cam in Blower Drive Support
wood (Fig. 12)
the housing as shown in Fig. 9. Take measurements
b. Position the drive spring seats in the support.
across the entire length of each rotor lobe to be certain
that a minimum clearance of .004 " exists at the air
Apply grease to the springs to hold the leaves
outlet side of all blowers and a minimum clearance of
together, then slide the two spring packs (15 leaves
.010 " (6V engine blower) exists at the air inlet side of
per pack) in place.
the blower (Fig. 15).
d. Place the blower drive cam over the end of tool J
Measure the clearance between the rotor
5209, insert the tool between the spring packs and
lobes, across the length of the lobes, in a
press the cam in place.
similar manner. By rotating the gears,
position the lobes so that they are at their
15. Install the drive spring support coupling on the rotor
closest relative position (Fig. 10.) The
gear at the rear end of the blower.
clearance between the lobes should be a
minimum of .010 "
NOTE: The coupling is placed on the left-
Measure the clearance between the end of
the ROTOR the blower end plate as shown
spacer is placed between the gear and the
in Fig. 11.; Refer to the chart for the
required minimum clearances.
16. Secure the cam retainer to the coupling with four
NOTE: Push and hold the rotor
1/4 "-28 bolts and tighten them to 14-18 lb.-ft torque.
toward the end plate at which the
17. On the 6V engine blower, install the governor drive
clearance is being measured.
plate on the right-hand rotor gear with four bolts and
tighten them to 8-10 Ib-ft torque.
After timing the rotors, complete assembly of the
13. Remove the bolts and washers used to temporarily
secure the front end plate to the housing. Then install
the front end plate to the blower with six bolts and
special washers and two reinforcement plates and
tighten the bolts to 20-25 lb.-ft torque.
1972 General Motors Corp.