Table of Contents
Advertisement
Crusader
MC-8
[ ,_G[ _ _ _
17_-_1_2 ___
DATE
MAINTENANCE
September, 1975 ]
MANUAL
l. Thermal Unit
2" Poppet
3. Valve Guide
4. Cage
5. Spring
6. Snap Ring
7. Bearing Plate - Smal I
8. Bearing Plate - Large
9. Body
10.
Cap & Adjusting Screw
11.
Gasket
12. Operating Spring
Figure
17-9:
Thermal Drain Valve (Ogontz)
testing thermal drain valves:
TO CHECK FOR VAL VE CLOSING: Take a
thermal drain valve that has been at room tem-
perature for at least one half hour. Pour 45°F or
warmer water into the inlet of the valve. The valve
should be closed and no water should flow.
TO CHECK FOR VALVE OPENING: Place ther-
mal drain valve in a container of ice. Cover it with a
minimum of water. The water should be about 33°F.
After one hour in 33°F water, remove water, remove
valve and pour water from container into inlet of
valve. Water should flow through discharge of valve.
MAINTENANCE
It is recommended that the thermal drain valve be
ins~ected for leakage at outlet port located in the
engme compartment once a year, preferably in the
Fall ~eason
before cold
weather
begins.
The
followmg procedure should be followed: If there is
no leak (ambient temperature above 40°F), the valve
is okay and needs no serv1cmg. If a leak is evident,
the following procedure should be followed: Remove
cap (10), thermal unit
(I),
cage (4), operating spring
(12) and bearing plate (8). Clean seat at bottom of
valve b9dy (9). Reassemble bearing plate, operating
bearing spring, cage, thermal valve unit and cap
making certain that the cage is properly lined up with
the valve port and that the cage assembly 1s not
cocked.
If the valve still leaks, the following procedure
should be followed: Remove cap
(I
0), thermal unit
(I)
and cage ( 4 ). Remove valve guide (3) and poppet
(2) from cage (4). Install new Buna S poppet and re-
install guide. Re-install cage and a new thermal unit.
Re-install cap making certain that cage (4) is
properly lined up with valve port and that the cage
assembly is not cocked.
Note: In case of a complete replacement of drain
valve, make sure to seal around outlet port in engine
compartment with mortite tape to prevent fumes from
engine compartment to enter the lavatory com-
partment.
Advertisement
Table of Contents
