TM 5-3655-210-12
Malfunction
Malfunction
Test or Inspection
Test or Inspection
Corrective Action
Corrective Action
WARNING
f. Remove the four capscrews (24)
Dry cleaning solvent, P-D-680 or P-
securing the pump (10). Remove the
S661, used to clean parts is potentially
fuel pump from the heater.
dangerous to personnel and property.
21. No Combustion Air Or Low Air Pressure
Use in a well-ventilated area as the
fumes are dangerous if inhaled. Avoid
Step 1. Check for a cracked or broken motor.
repeated and prolonged skin contact.
Replace motor (fig. 4-22).
Do not use near open flame or
Step 2. Rotate blower fan to see if it is slipping on shaft.
excessive heat. Flash point of solvent
Tighten fan lock screw.
is 100F.-138F. (38C.-59C.).
Step 3 Check for a clogged blower housing.
WARNING
Clean tip with solvent (Fed. Spec. P-D-
Dry cleaning solvent, P-D-680 or P-
680 or P-S-661).
S661, used to clean parts is
potentially dangerous to personnel
Step 2. Check for a dirty or clogged fuel filter.
and property. Use in a well-ventilated
Replace fuel filter element as follows:
area as the fumes are dangerous if
Refer to figure 4-21 and disassemble the
inhaled.
Avoid repeated and
prolonged skin contact. Do not use
Step 3. Check for an air leak in fuel line.
near open flame or excessive heat.
Tighten or replace defective line.
Flash point of solvent is 100F.-138F.
(38C.-59C.).
wear.
Replace solenoid valve (para. 4-111).
Wash all parts in a cleaning solvent (Fed.
Step 5. Check for a cracked, broken, or leaking fuel
Spec. P-D-680 or P-S-661).
pump.
Replace fuel pump as follows:
22. Conversion Heater Overheating Condition
4-19).
Step 1. Check for low coolant level.
b. Remove the four capscrews (11)
Add coolant.
that secure the plate (13) to the
Step 2. Check for loose wires in disconnect plug.
combustion head.
Tighten all loose connections.
c Remove the four machine screws
Step 3 Check for a cracked or broken water
and washers securing the blower (15)
temperature switch.
to the pump (10) and slide the blower
Replace the switch (para. 4-113).
(15), plate (13), and gasket (14) out
and away from the heater.
d. Remove the two fuel tubes (6 and
7).
e. Disconnect and tag the taped
leads (19).
4-20
