a. Introduction. To avoid repetition, general procedures for repair are outlined below. Repair procedures and
tolerances unique to a specific item will be covered in the section or paragraph relating to that item.
Replace all cracked castings.
(2) Repair minor damage to machined surfaces with a fine file, emery cloth, or crocus cloth dipped in
drycleaning solvent. Replace all castings on which machined surfaces are burred or nicked to the point of interferring with
assembly or operation.
(3) Repair minor warpage of mounting flanges and gasket surfaces by working the surface across a sheet
of emery cloth held tightly on a surface plate or other flat surface. Finish similarly with crocus cloth. Replace castings
having flanges which are warped to the point of impairing assembly or operation.
Repair damaged pipe or capscrew threads in tapped holes with a tap.
Pipe plug threads in castings must be in good condition to prevent oil or water leakage.
Replace all galled, pitted, or damaged ball bearings.
Refer to TM 9-214 for maintenance of bearings.
d. Studs. Replace all bent or loose studs and studs showing evidence of stretching. Repair minor thread
damage with a thread chaser. Replace all studs having stripped or damaged threads. Procedures for removing and
replacing studs are outlined below.
(1) Removal. Using a stud extractor, back the studs out slowly to avoid heating and possible seizure. If a
stud is broken off too short to use a stud extractor, drill the stud and extract it with any easy out.
(2) Replacement. Only standard studs are supplied for replacement. If threaded openings are damaged
and retapping will not clean up threads, drill and tap opening in casting and install a threaded insert.
All replacement studs have a special coating and must have a small amount of mica-base antiseize
compound (MIL-A-13881) applied on the threads before the stud is installed in the casting.
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