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 TM 55-1905-217-34
housing. Tighten the screws securely. Do not use lock washers on these screws.
(g) Remove the oil seal pilots from the rotor shafts.
(9) With the blower housing, rotors and end plates still supported in a vertical position on the two wood blocks, install
the roller bearings on the rotor shafts and in the front end plate as follows:
(a) Lubricate one of the roller bearings (14, figure 3-31) with engine oil. Start the bearing, numbered end up,
straight on one of the rotor shafts.
(b) Place installer J 6270-4 on top of the bearing and tap the bearing on the shaft and into the front end plate.
(c) Place the bearing retainers on top of the bearings and the end plate; then, install the retainer bolts and lock
washers. Tighten the bolts to 7-9 foot-pounds torque.
(10) Start the end of the water pump drive coupling (6) straight into the left-hand helix rotor shaft. Then, place a clean
shop towel between the blower rotors to prevent them from turning. Install the drive coupling retaining bolt and draw the
coupling and slinger tight against the end of the shaft, then tighten the bolt to 18 foot-pounds torque.
(11) Affix a new gasket (10) to the blower front end plate cover (7).
(12) Position the end plate cover over the end plate dowel pins, with the large hole in the cover toward the top of the
end plate, then push the , cover against the end plate. Install the ten bolts and lock washers. Tighten the bolts to 13-17 lb-
ft torque.
(13) Install the ball bearings on the rotor shafts and in the rear end plate as follows:
(a) Reverse the position of the blower housing on the two wood blocks, end for end.
(b) Lubricate the ball bearings with engine oil. Start the bearing, numbered end up, straight on one of the rotor
shafts.
(c) Place installer J 6270-7 on top of the bearing and tap the bearing straight on the shaft and into the rear end
plate.
(d) Place the bearing retainers on top of the bearings and the end plate; then, install the retainer bolts and
lockwashers. Tighten the bolts to 7-9 foot-pounds torque.
(14) Make a preliminary check of the rotor-to-end plate and rotor-to-housing clearances at this time with a feeler
gage. Refer to figure 3-33 for minimum blower clearances.
3-46
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