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The compressor oil capacity is 10
fluid ounces. If there is a surplus of oil
in the system, too much oil will circulate
with the refrigerant, cause a reduction in
cooling capacity of the system.
Too little oil will result in poor
lubrication of the
compressor.
When it is necessary to replace a
component of the refrigeration system,
certain procedures must be followed to
assure that the total oil charge in the
system is correct after the new part has
been fitted to the
car.
When the compressor is operated,
oil gradually leaves the compressor and is
circulated through the system with the
refrigerant. Eventually a balanced condition
is reached in which a certain amount of oil
is retained in the compressor and a certain
amount is continually circulated.
If a component is removed from
the system after operation, some oil will
go with it. To maintain the original total
oil charge, it is necessary to compensate for
this by replacing oil in the new replace-
ment part.
The procedure for replacing oil
is as follows:
-
COMPRESSOR ONLY
1. Idle the engine for 10 minutes at
1000-1500 rpm at maximum cooling and
high blower speed to allow oil to circulate
in the normal
manner.
2. Discharge the system and remove
the.
compressor from the vehicle. Remove
the drain plug and pour the oil into a
measuring container. Make a note of the
amount of drained oil, then discard it.
3_ If a new compressor is being fitted
drain all initial fill oil from the sump.
4. If the oil drained from the removed
compressor measured less than 4 ounces,
replace 6 ounces of new oil in the re-
placement compressor.
5. If the oil drained from the removed
compressor measured between 4 and 6
ounces,
the oil is properly distributed
throughout the
system.
Simply replace
an equal amount of new oil in the replace-
ment
compressor.
6. If the oil drained from the removed
compressor measured 6 ounces or more,
replace ONLY 6 ounces of new oil in the
replacement
compressor.
REPLACEMENT COMPONENTS
Whenever replacing a component of
the air conditioning system, add measured
quantities of oil to the component to
assure that the total oil charge in the
system is correct before the unit is operated.
Oil should be added to replacement
components as follows
:-
Evaporator
Add 3 fluid ounces
Condenser
Add 1 fluid ounce
Receiver
Add 1 fluid ounce
PART 16-2- AIR CONDITIONING
Condenser and receiver assembly add 2
fluid ounces.
Oil should be poured directly into the
replacement component.
If an evaporator is installed, pour oil
into inlet pipe with the pipe held vertically
so oil will drain into the core.
If any other components such as
valves or hoses are replaced, no additional
oil is necessary whilst the air-conditioning
system is discharged. The compressor oil
level can be checked using the tools
shown in figures 16-17 as follows:-
1. Remove the oil filler plug from
the
compressor.
Insert a flattened 1/8 inch
diameter rod (Fig. 17) in the oil filler
'
hole
until it bottoms.
The dipstick must be wiped completely
clean before insertion. If necessary, slightly
rotate the compressor crankshaft by hand
so that the dipstick will clear the crank-
shaft.
On horizontally mounted compressors,
the oil check hole is located on the side of
the crankcase that faces
up.
On the
opposite or downward side, there is a
corresponding boss provided on the inner
wall as an alternate oil check hole for a
different mounting. When checking the oil
level on such a compressor, angle the
dipstick so that it bottoms against the
lower side of the crankcase and not
against the boss.
4. Pull out the dipstick, and check
the oil indication.
It
should show at least
the minimum amount of oil as indicated
in Fig. 16.
If the oil level is low, add ESA-
M2C31-A (Ford Part No. C9AZ-19577-
A) oil
If too much oil is indicated proceed
as follows:-
(a) Draw out all of the oil using a trap
similar to that shown in Fig. 17, or remove
the compressor from the vehicle and pour
the oil out of the crankcase.
(b)
Add oil until at least the minimum
amount is indicated on the dipstick
.
5. Remove the dipstick and refit the
filler
plug.
SAFETY PRECAUTIONS
The refrigerant used in the air con-
ditioner system is Refrigerant-12
.
Re-
frigerant-12 is nonexplosive, nonin-
flammable, noncorrosive, has practi-
cally no odor, and is heavier than air.
Although it is classified as a safe re-
frigerant, certain precautions must be
observed to protect the parts involved
and the person who is working on
the unit.
Use only Refrigerant-12.
Do not
use refrigerant that was canned for
pressure
operated accessories (such
as boat air horns).
It
is not pure
Refrigerant-12 and will cause a mal-
16-19
function. Liquid Refrigerant-12, at
normal atmospheric pressures and
temperatures, evaporates so quickly
that it contacts. For this reason,
extreme care must be taken to pre-
vent any liquid refrigerant from
coming in contact with the skin and
especially the eyes.
Refrigerant-12 is readily absorbed
by most types of oil.
It
is therefore
recommended that a bottle of sterile
mineral oil and a quantity of weak
boric acid solution be kept nearby
when servicing the air conditioning
system.
Should any liquid refrigerant
get into the
eyes,
use a few drops of
mineral oil to wash them
out,
then
wash the eyes clean with the weak
boric acid solution. Seek a doctor's
aid immediately even though irritation
may have
ceased.
Always wear safety goggles when
servicing any part of the refrigerant
system.
The Refrigerant -12 in the system is
always under pressure. Because the
system is tightly sealed, heat applied
to any part would cause this pressure
to build up
excessively.
To avoid a dangerous explosion,
never weld, use a blow torch, solder,
steam clean, bake body finishes, or
use any excessive amount of heat on
or in the immediate area of any part
of the air cooling system or refriger-
ant supply tank, while they are
closed to the atmosphere whether
filled with refrigerant or not.
The liquid refrigerant evaporates so
rapidly that the resulting refrigerant
gas will displace the air surrounding
the area where the refrigerant is re-
leased. To prevent possible suffo-
cation in enclosed areas, always dis-
charge the refrigerant from an air
cooling system into the garage
ex-
haust collector. Always maintain
good ventilation surrounding the
work area.
Although
Refrigerant-12
gas,
under normal
conditions,
is non-
poisonous, the discharge of refrigerant
gas near an open flame can produce
a very poisonous gas. This gas will
also attack all bright metal
surfaces.
This poisonous gas is generated when
the flame-type leak detector is used
.
Avoid inhaling the fumes from the
leak detector. Make certain that
Refrigerant-12 is both stored and
installed in accordance with all state
and local ordinances.
When admitting Refrigerant-12 gas
into the cooling unit, always keep the
tank in an upright
position.
If the
tank is on its
side
or upside down
,
liquid Refrigerant-12 will enter the
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