Creative Engineering ROCK-A-FIRE EXPLOSION - Page 70

Hinges Cont.
C. On one side of the old style hinge is the bushing, and on the
other side their is a 5/16" hole and set screws to hold the pin
in place. It is important to the operation of the hinge that
the pin is held solid. If it cannot be held solid because the
set screw taped hole is striped, you can repair it by
drilling and taping the hole to thg ngxt bigggr tap sizg. If
the hole is elongated, of course the hinge must be replaced.
1. Determine the present size of the taped set screw hole.
2. Drill out the hole to the next larger tap size.
3. Tap the hole, clean the part and re-assemble using the
correct size set screw.
D. If the old hinge must be replaced and you have an old style
hinges mating with the new style, refer to Retro-Fit Drawings,
Pages 3-035 thru 3-037 for assembly.
E. The new style, Needle Bearing type hinge, should have few
problems, if the hinge is greased properly in P.M. (Just
apply grease "C.E.I. lube" between the flanges of the hinge and
actuate the hinge to work the grease in) The new style hinge
will only be disassembled during rebuilding of the character,
and for repair. (See Page 1-009, Semi-Annual P.M.)
F. Repair of the new style hinge is limited because the hole is
usually marred and the bearing loosens in the hole or is
damaged do to wear and tear. If care is taken during P.M. of
the show, these problems can be caught before replacement of
the hinge is required.
G. To repair a new style hinge:
1. Using an Arbor press and a 3/8" or 7/16" Steel Pin, press
out the defective bearing, denote the length of the bearing
and get a replacement. The needle bearings used in the show
are 5/16"ID x 1/2"0D x 3/8" Long (Part # 28-025-945) and
5/16"ID X 1/2"0D X 5/16" long. (Part # 28-025-950)
2. Clean the hinge of grease and any foreign matter.
3. Press the correct bearing into place, making sure the
bearing is pressed straight.
3-033