T O 35 C2-3-442-2
P-8-627-34
TM-07464A-35
T M 5-6115-457-34
1 1 - 1 2 . CLEANING.
11-11. DISASSEMBLY.
a. Clean electrical components with a
Refer to figure 11-2 and disassem-
cloth moistened with an approved cleaning
ble heater in the order of index numbers
solvent, and dry thor oughly.
assigned. Pay particular attention to the
b. Remove carbon desposits from burner
following:
assembly using a suitable wire brush.
WARNING
a . R e m o v e c o v e r ( 1 ) . T a g and di scon-
nect wires.
Cleaning Solvents are flammable and
moderately toxic to skin, eyes and
respiratory tract. Eye and skin
CAUTION
protection required. Good general
ventilation is normally adequate.
Use care when removing quartz
rod (14) as it is easily broken if
Compressed air used for cleaning and
dropped.
drying purposes can create airborne
particles that may enter the eyes.
b . Remove receptacle assembly (3),
Pressure shall not exceed 30 psig.
Eye protection is required.
terminal block (5), and flame switch
assembly (8).
c . Clean orifice assembly by forcing
filtered compressed air through orifice in
c . Remove igniter (18), gasket
the reverse flow direction.
d. Clean parts with an approved cle an -
(19),
ing solvent, and dry thoroughly.
NOTE
1 1 - 1 3 . INSPECTION.
a . Inspect components for cracks,
Do not remove regulator
d e n t s , distortion, burrs, nicks, and dam-
valve assembly (21) until
aged threads.
after casting (40) has been
b. Inspect insulation for damage.
removed.
c . Inspect springs for condition.
Inspect spring (60, figure 11-2). Using a
d. Remove burner assembly (48), and
suitable spring compressor, apply a load
motor and pump assembly (55) as a
of 1 0.1 pounds and compress spring (60)
c o m p l e t e assembly.
to a working length of 0.750 inch. Spring
should measure 1.164 inches free length
NOTE
after test.
d . Inspect receptacle assembly for
Coolant pump (56) cannot be re-
loose connections and bent or broken te r-
moved as a complete assembly.
minal pins. Check for short to case and
The unit must be disassembled dur-
surrounding pins. Check for continuity
ing removal as the pump rotor (67)
between wires and terminal pins.
is secured to the motor shaft by a
e . Inspect orifice assembly for proper
set screw (66).
orifice opening. Opening should be
0.012 inch diameter.
e . Before disassembly of coolant pump,
f. Inspect regulator valve assembly (21)
make an alignment mark across adapter
as follows:
1. Check resistance of solenoid coil;
(68), cam ring (63), and plate (58) for cor-
resistance should be 150 ohms.
rect alignment during reassembly.
11-5
Change 8
