Lesson 4/Learning Event 3
NOTE
Direct support maintenance personnel may have to help replace the
fuel filter element. Organizational maintenance personnel do not
have proper tools to remove the cover nut of the fuel filter with
the piping arranged as it is. If the fuel filter element must be
replaced, organizational maintenance personnel must remove the
tubing first.
Ignition System.
Ignition system repair will consist
of
cleaning
and
regapping the magneto points by the following method.
Disconnect the electrical ignition cable from the magneto and remove
the end cap by removing four screws. Carefully separate the end cap
and gasket from the magneto frame.
Inspect the contacts for
evidence of burning, pitting, or wear. Use a contact point dresser
to dress down the contacts. Rotate the drive arm until the breaker
arm is riding on the high surface of the cam. Insert a feeler gage
between the contact points and check that the gap is between 0.015
and 0.018 inch. Loosen and tighten screws until the gap is correct.
If other maintenance is necessary, notify direct support maintenance
personnel. Position the end cap and gasket on the frame and fasten
them in place with the four screws and lockwashers.
Connect the
electrical ignition cable to the magneto.
Low Pressure Heating Boiler. Boiler components that are authorized repair
by organizational maintenance personnel are the flame switch, nozzle holder,
ignition plug and spark arrester.
Each item and repair procedures are
described below.
Flame switch (SPST thermostatic). Remove the five screws and washers that
fasten the side exhaust insulation cover to the exhaust insulation cover and
cabinet frame. Remove the three nuts and washers that fasten the cover to
the boiler and remove the cover. Disconnect the electrical wiring from the
flame switch.
Using a 5/8-inch open-end wrench, remove the flame switch
from the exhaust flue. Installation of the flame switch is the reverse of
removal.
Nozzle holder and ignition plug (figure 19 on page 71). Remove the cover
plate. Disconnect the nozzle-valve line and the combustion-return line from
the nozzle holder. Rotate the combustor nozzle holder to clear the holding
bracket and remove the nozzle holder and combustor plate as a unit from the
combustor chamber.
Clean all parts thoroughly in dry-cleaning solvent.
Examine all parts for cracks, breaks, obstructions, damaged threads, and
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