TM 5-4310-451-14
5-8. REPAIR INSTRUCTIONS.
a.
Repair castings, for giong, and machined metal parts using the following Instructions:
(1)
Repair minor cracked castings or for giong in accordance with TM 9-237.
(2)
Repair minor damage to machined surfaces with a fine mill file or an abrasive cloth (Item 9, Appendix
E).
(3)
Replace any part with deeply nicked machined surface that could affect the assembly operation.
(4)
Repair minor damage to threaded capscrew holes with thread tap of same size to prevent cutting
oversize.
b.
Reshape oval mounting holes to round. Drill to receive bushing with required inner diameter. Stake bushing
in place with center punch.
c.
Replace any bolt, screw, nut, or fitting with damaged threads. Inspect tapped holes for thread damage. If
cross-threading or spalling is evident, retap the hole for the next oversize screw or stud. If retapping will weaken part, or if
cost of part makes retapping impractical, replace damaged part. Chasing threads with the proper size tap or die may often
be enough.
d.
After repair, clean all parts thoroughly to prevent dirt, metal chips, and other foreign matter from entering any
working parts.
5-9. ASSEMBLY INSTRUCTIONS.
a.
Extreme care must be used In all component assembly operations to ensure satisfactory engine
performance. Follow the guidelines below when assembling components:
(1)
Cleanliness Is essential in all component assembly operations. Dirt and dust, even In very small
quantities, are abrasive. Parts must be cleaned as specified and kept clean until assembly. Wrap or cover parts and
components when assembly procedures are not immediately completed.
(2)
Coat all bearings and contact surfaces with engine oil (Item 31, Appendix E) to ensure lubrication of
parts during initial engine starting.
(3)
Replace all gaskets and performed packings during assembly.
b.
During assembly of shafts and bearings In housings, first mount bearing on shaft. Install the assembly by
applying force to the shaft. When mounting bearings on shafts, always apply force to inner races.
c.
When Installing oil seals, perform the following steps:
(1)
Coat oil seals evenly with oil or grease.
(2)
If oil seals are to be installed over keyed or splined shafts, use a guide constructed of very thin gage
sheet metal shaped to the required diameter. This will prevent sharp edge of keyway or splines from cutting the oil seal.
(3)
Install oil seals with seal lip facing in, applying an even force to the outer edge of the oil seal.
d.
Apply sealing compound (Item 14, Appendix E) to threads of pipe plugs before installation. This will provide
a better seal and will permit easier removal of pipe plug.
5-10.
LINES AND PORTS.
To keep dirt from contaminating fluid systems when removing and installing fuel, oil, and coolant lines, perform the
following steps:
(1)
Clean fittings and surrounding area before disconnecting lines.
5-9
