TM 55-1520-240-23-3
4-33
REPLACE BUSHINGS IN FORWARD ENGINE MOUNT LUGS (AVIM)
(Continued)
4-33
3.
Respotface hole (5) to increase spotface
diameter (7) to 1.38 inches. Do not increase
spotface depth (8).
4.
Spotface radius (9) to 0.030 inch.
5.
Measure inside diameter (6) of hole (5). Record
measurement.
6.
Measure width (10) of lug (2). Record
measurement.
7.
Make new shoulder bushing (1) from steel (E367)
as follows:
a.
Make bushing length (11) from flat end (12)
to counterbore (13) equal to lug width (10).
(See measurement recorded in step 6.)
b.
Make outside diameter (14) of bushing (1)
0.0008 to 0.0023 inch more than inside
diameter (6) of hole (5). (See measurement
recorded in step 5.)
c.
Make outside diameter (15) of shoulder (16)
1.125 inches.
d.
Make width (17) of shoulder (16) 0.060 inch.
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