TM 5-4520-241-14
b. Cleaning and Inspection.
WARNING
Clean parts in a well-ventilated area. Avoid inhalation of solvent fumes and
prolonged exposure of skin to cleaning solvent. Wash exposed skin thoroughly.
Dry cleaning solvent (fed. spec. P-D-680) used to clean parts is potentially
dangerous to personnel and property. Do not use near open flame or excessive
heat. Flash point of solvent is 100 F (38 C).
(1) Wipe the electrical leads and the outside of the ignition transformer with a cloth dampened in dry cleaning
solvent (fed. spec. P-D-680).
(2) Clean all non-electrical parts in cleaning solvent and dry thoroughly.
(3) If the ignition transformer shows signs of overheating or malfunctioning, replace it.
(4) Use a multimeter to check for continuity across both the primary and secondary winding of the transformer.
When checking secondary windings, check across the insulated output contact and unpainted surface of the heater case.
Continuity must exist across both sets of windings.
(5) Inspect the contact springs and wire terminations at each end of the ignition cable. The wires in the ignition
cable are flared back around a hollow eyelet which retains the contact spring. Check that the small brad retains the wires
where they pass through the eyelet. Poor contact causes arcing, heat buildup, and other problems. Replace the cable if
it is damaged, or if wire terminations show signs of arcing or looseness.
c. Assembly. Assemble in the reverse order of disassembly, and note the following:
(1) To reinstall the ignition cable, feed one end of the cable up through the heater case shelf toward the igniter.
The grommet which protects the cable is split, and can be worked into the hole with the cable in place.
(2) Be sure to tighten the ignition cable securely at the igniter and at the ignition transformer.
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