low oil pressure NISSAN 300ZX 1984 Z31 Heather And Air Conditioner Workshop Manual

DISCHARGING, EVACUATING, CHARGING AND CHECKING
Precautions
WARNING:
Always be careful that refrigerant does not
come in contact with your skin.
Always wear
eye protection when working
around the
system
Keep refrigerant containers stored below 50°C
(122" F) and never drop it from a high place
Work
in well-ventilated area because refrigerant
gas evaporates quickly and breathing may be-
come difficult due to the lack of oxygen
Keep refrigerant away from open flames
be-
cause poisonous gas will be produced if it is
burns.
Do not use steam to clean surface of condenser
or evaporator
Be sure to use cold water or
compressed air.
Compressed
air must never be used to clean a
dirty line Clean with refrigerant gas
Do not use manifold gauge whose press point
shape
is different Otherwise, insufficient
evacuating may occur
fJalve press point
NG SHA919A
Do not over-tighten service valve cap.
Do not allow refrigerant to rush out. Other-
wise, compressor oil will
be discharged along
with refrigerant
Discharging
Slowly open the valves to discharge only refriger-
ant If they
are opened quickly, compressor oil will
also be discharged
To low-pressure IerYlCe valve
To high-pressure service valve
*
SHA240B
4c==--J
HA-I 2

PRECAUTIONS FOR REFRIGERANT CONNECTION
WARNING.
Gradually loosen discharge side hose fitting, and re-
move
it after remaining pressure has been released
When replacing or cleaning refrigerant cycle com-
ponents, observe the following
Do not leave compressor on its side or upside
down for more than 10 minutes, as compressor
oil will enter low pressure chamber
When connecting tubes, be sure to
use a torque
wrench
torque wrench
SHA896A
After disconnecting tubes, plug all openings im-
mediately to prevent entrance of dirt and mois-
tu
re
Plug
SHA058
Do not reuse used O-ring
When connecting tube, apply compressor oil to
portions shown in illustration
Be careful not
to apply oil to threaded portion
O-ring must be closely attached to inflated por-
tion of tube
NG
lnflaied pomon
OK - SHA897A
After inserting tube into union until O-ring is
no more visible, tighten nut to specified tor-
que
u"'06a e GO K GN G 7
b
SHA898A
After connecting line, conduct leak test and
make sure that there
IS no leak from connec-
tions When the
gas leaking point IS found, dis-
connect that line and replace the O-ring Check
fit for further use and then tighten connections
to seal seat for the specified torque
HA-20

COMPRESSOR OIL--For MJS170
Checking and Adjusting
The oil used to lubricate the compressor is circulat-
ing with the refrigerant
Whenever replacing any component of the system
of
a large amount of gas leakage occurs, add oil to
maintain the original amount
of oil
Total amount of oil in the system:
150 mP (5.1 US fl 02, 5.3 Imp fl 02)
KV994A9690
KV992C50822 /
i;(V994A9690 SHAO17A
1
2
3
Connect oil separator KV994A9690 between
compressor discharge
side and condenser
Evacuate and charge the system
Operate compressor
at engine idling with air
conditioner
set for maximum cooling and high
fan speed
4 Stop compressor operation after 10 minutes
Never allow engine speed to exceed idling speed
CAUTION.
Do not continue compressor operation for more
than 10 minutes
5 Disconnect oil separator and connect refriger-
ant line
to original positions
6 Disconnect low flexible hose from compressor
suction
valve
7 Add new oil from compressor suction port
Amount of oil to be added:
120 mP (4.1 US fl oz,4.2 Imp fl 02)
Low pressure ride
SHA702
0 Oil remains unremoved in the system about 30
mP (1.0 US fl 02, 1 1 Imp fl 02).
8 After adding oil, rotate compressor clutch by
hand 5 to 10 turns
9 Connect refrigerant line and evacuate and
charge system
10 Conduct leak
test and performance test
11 Gradually loosen drain cap of oil separator to
release residual pressure Remove cap and drain
Oil
12 To prevent formation of rust and intrusion of
moisture or dust, perform the following before
placing oil separator kit into storage
1) Cap each opening of flexible hose and double
union securely
2) Cap oil separator, evacuate it from service
valve, and charge refrigerant
HA-23