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 TM 55-1905-217-34
Figure 3-32. Proper shim location for correct rotor lobe clearance
(a) Place an oil seal pilot J 6270-5 on the short (non-splined) end of each rotor shaft. Then, place the rotors in
mesh with the omitted serration in the shafts in alinement as shown in figure 3-32.
NOTE
When oversize oil seals are used in the blower end plate, use oil seal spacer installers J
1682-13 for the oil seal pilots in place of J 6270-5.
(b) Insert the blower rotors with oil seal pilots straight into the blower housing with the righthand helix rotor at the
top, flange, side of the housing. Then, push the rotor shafts and oil seal pilots on through the oil seal in the front end plate.
(c) Remove the oil seal pilots from the rotor shafts.
(8) Attach the blower rear end plate to the
blower housing as follows:
(a) Reverse the blower housing on the bench (rear end of housing facing the outside of the bench).
(b) Place an oil seal pilot J 6270-5 on the serrated end of each rotor shaft.
NOTE
When oversize oil seals are used in the blower end plate, use oil seal spacer installers J
1682-13 for the oil seal pilots in place of J 6270-5.
(c) Check the dowel pins. The dowel pins must project .380" from the flat inner face, and .270" from the outer face
of the rear end plate to assure proper alinement of the end plate to the housing and the cover to the end plate.
(d) Place the rear end plate in position in front of the oil seal pilots with the flat finished face of the end plate facing
the blower housing and the mark TOP on the end plate at the top flange side of the housing.
(e) Place the rear end plate over the oil seal pilots and start the dowel pins straight into the dowel pin holes in the
housing. Push or tap the end plate against the housing.
(f) Insert the two fillister head screws through the end plate and thread them into the
3-45
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