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 TM 55-1905-221-14-1
Table 1-1. Engine Repair and Replacement Standards (American Standard) (Continued).
Manufacturers'
Dimensions and
Desired
Component
Tolerances In Inches
Clearance
Maximum*
Allowable
Wear and
Minimum
Maximum
Minimum
Maximum
Clearances
Inches
Inches
Inches
Inches
In Inches
BLOWER DRIVE GEAR
Backlash ................................ .........................
..........
..........
0.0030
0.0080
0.010
Gear-to-hub fit ................................ ................
..........
..........
0.0005
0.0010
..........
................................ ................................ ....
..........
..........
..press
. loose
Support-to-end plate ................................ .......
..........
..........
0.0005
0.0025
................................ ................................ ....
..........
..........
..press
. loose
Support bushing inside diameter.....................
1.6260
1.6265
..........
..........
..........
Hub diameter at bushing................................ .
1.6240
1.6250
..........
..........
..........
Hub-to-support bushing clearance...................
..........
..........
0.0010
0.0025
0.0050
Hub-to-cam clearance................................ .....
..........
..........
0.0020
0.0070
End thrust ................................ .......................
0.0050
0.0080
..........
..........
0.0100
BLOWER
Backlash-timing gears................................ .....
..........
..........
0.0005
0.0025
0.004
Oil seal (below end plate surface)...................
..........
..........
0.002 .
0.008..
..........
Pin-dowel (projection beyond inside face
of end plates)................................ ...............
..........
..........
0.380 .
..........
..........
Clearances
Rotor to end plate-gear end ............................
.
..........
..........
0.007 .
..........
..........
Rotor to end plate - front end..........................
..........
..........
0.014 .
..........
..........
Rotor to housing - inlet side.............................
..........
..........
0.015 .
..........
..........
Rotor to housing - outlet side...........................
..........
..........
0.004 .
..........
..........
1-18
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