3.4 Blower
DETROIT DIESEL 53
15. Assemble the blower drive spring support as
follows:
a. Place the drive spring support on two blocks of
Fig. 17
Inserting Cam in Blower Drive
wood (Fig. 17).
Support
b. Position the drive spring seats in the support.
the housing as shown in Fig. 14. Take measure-
ments across the entire length of each rotor lobe
c. Apply grease to the springs to hold the leave:
to he certain that a minimum clearance of .004"
together. then slide the two spring packs (15
exist at the air outlet side of all blowers and a
leaves per pack) in place.
minimum clearance of 0075" (in-line engine
blower)
exists at the
d. Place the blower drive cam over the end of tool
air inlet side of the blower (Fig. 15).
J 5209, insert the tool between the spring packs
and press the cam in place.
b. Measure the clearance between the rotor lobes,
across the length of the lobes, in a similar
16. Install the drive spring support coupling on the
manner By rotating the gears, position the lobes
rotor gear at the rear end of the blower.
so that they are at their closest relative position
(Fig. 15) The clearance between the lobes should
be a minimum of 010"
c. Measure the clearance between the end of the
rotor and the blower end plate as shown in
Fig. 16. Refer to the chart for the required
minimum clearances.
NOTE: Push and hold the rotor toward the end
plate at which the clearance is being measured.
After timing the rotors, complete assembly of the
blower.
14. 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
17. Secure the cam retainer to the coupling with four
tighten the bolts to 20-25 lb-ft torque.
1/4 "-28 bolts and tighten them to 14-18 lb-ft torque.
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