TM 1-1520-238-23
4-274.2
Change 4
4.85A.
NO. 1 OR NO. 2 AFT ENGINE MOUNT SUPPORT BEARING REPLACEMENT (AVIM) – continued
4.85A.5. Inspection
a. Check mount for cracks. None allowed.
d. Check engine mount for dents.
(1) Maximum allowable depth is 10 percent of material thickness.
(2) Edge dents maximum allowable depth is 0.100 INCH.
c. Check mount for corrosion (para 1.49).
d. Measure ID of mating bore.
(1) Diameter allowable 0.8113 to 0.8118 INCH. Use cylinder gage and caliper set.
4.85A.6. Installation
WARNING
Frostbite or freezing of tissue can occur from improper handling of chilled parts. If a burning
sensation is felt, seek medical aid.
Do not use heater or oven near flammables. Fatal explosions may result. Handling hot items
presents a serious burn potential. Post warning signs in work area to alert people to high
temperature items. If burns occur seek medical aid.
Use proper protective gloves because of extreme temperature involved.
CAUTION
Do not freeze bearing below -321 F (-196 C).
Do not heat ferrous parts over 350 F (177 C).
Do not allow compounds to enter bearing. Bearing may be damaged.
Installation by arbor press should be avoided.
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