Preliminary Requirements

Safety Requirements

WARNING

IT IS THE RESPONSIBILITY OF THE OPERATOR TO OBTAIN AND OBSERVE THE MANUFACTURERS MATERIAL SAFETY DATA SHEETS FOR CONSUMABLE MATERIALS INFORMATION SUCH AS, HAZARDOUS INGREDIENTS, PHYSICAL/CHEMICAL CHARACTERISTICS, FIRE, EXPLOSION, REACTIVITY, HEALTH HAZARD DATA, PRECAUTIONS FOR SAFE HANDLING, USE AND CONTROL MEASURES AND ALSO TO TAKE LOCAL REGULATIONS INTO CONSIDERATION.

Procedure

1. SUBTASK 70-46-02-460-001 Bushings and Bearing Liners

   1. Use CoMat 05-139 ABRASIVE CROCUS CLOTH and CoMat 10-039 ENGINE OIL or CoMat 10-040 LUBRICANT (ENGINE OIL), to clean bushings with light scratches and scores. Do not touch the glossy surfaces of the bushings, unless they have scratches or scores.

   2. NOTE

      The alternative procedure to remove a bushing is to grind two grooves, 180 degrees apart, in the internal diameter of the bushing; but be very careful not to grind into the housing. If the bushing is carburized, it will be easier to grind when locally heat-treated to approximately 400 deg F (204 deg C) for 15 to 20 minutes; but be very careful not to let the housing become too hot. Then, with a drift or punch and a hammer, break the bushing, into the housing, before it is removed.

      If the bushings are locked with pins, remove the pins before you remove the bushings. It may be necessary to use a drill to remove a pin. Always use a drill jig, to guide the drill, then only drill to a sufficient depth to release the bushing. The necessary drill jigs are included in the tool data specified for each type of bushing. If a drill jig is not available, carefully drill the pin and use a bushing or lever as a guide. Alternatively, remove the pin with a small drift or punch.

   3. When the lock pin is removed, pull or push out the bushing.

   4. NOTE

      If necessary, use an oversized bushing or liner to get the correct fit.

      When a new bushing is installed, make sure that the oil holes or grooves in the bushing align with the oil holes or grooves in the boss.

   5. If the bushing has a flange, use a 0.001in. (0.025mm) feeler gage to make sure that the flange is correctly seated.

   6. To drill a new pin hole, use the same drill jig used to remove the used pin. Drill the new hole at least 30 degrees from other holes and be careful not be break or drill into any oil holes.

   7. If the used pin was removed with a punch, transfer drill the new pin hole; with the used pin hole in the boss used as a guide.

   8. Install the new pins with a punch. Peen the hole in the boss, if the new bushing was transfer drilled.

   9. Ream the new bushing to the correct dimension; then polish it with CoMat 05-139 ABRASIVE CROCUS CLOTH and CoMat 10-039 ENGINE OIL or CoMat 10-040 LUBRICANT (ENGINE OIL).

   10. Use the correct ream gage, to make a dimension check of the bushing.

   11. Fully clean the bushings and oil holes, after the ream procedure.

   12. When the bushings are replaced frequently, and the housing has become weak because of the many pin holes, the unwanted holes can be filled by the procedure that follows:

       1. Fully clean the housing.

       2. Fill the pin holes with CoMat 10-057 FILLER. Make sure that no air is caught in the filler. Use a pointed or hyperdermic type of tool, to apply the filler, then apply the filler tightly.

       3. Let the filler set, at a temperature of approximately 68 deg F (20 deg C), for at least four hours.

       4. NOTE

          The pin holes can also be filled with weld. Use a weld wire which is made of the same material as the housing (Refer to the SPM TASK 70-31-03-310-501). Machine away the surface of the weld, to make it level with the surface of the housing.

          Machine away the unwanted filler, level with the surface of the housing.