To see the original article with images check it out here: Garage411: Nissan 240sx Air Conditioning: compressor oil, lines, fittings and more
REFRIGERANT OIL
FYI: DO NOT exceed AC system refrigerant oil capacity when servicing system.
Only NEW, moisture-free refrigerant oil should be used in the air conditioning system. This oil is highly refined and dehydrated so moisture content is less than 10 parts per million. The oil container must be tightly closed at all times when not in use, or moisture from the air will be absorbed into the refrigerant oil.
SERVICING PRECAUTIONS
DISCHARGING SYSTEM
Discharge AC system using approved refrigerant recovery/recycling equipment. Always follow recovery/recycling equipment manufacturer's instructions. After refrigerant recovery process is completed, the amount of compressor oil removed must be measured and the same amount added to AC system.
DISCONNECTING LINES AND FITTINGS
After system is discharged, carefully clean area around all fittings to be opened. Always use 2 wrenches when tightening or loosening fittings. Some refrigerant lines are connected with a coupling. Special tools may be required to disconnect lines. Cap or plug all openings as soon as lines are removed. DO NOT remove caps until connections of lines and fittings are completed.
CONNECTING LINES AND FITTINGS
FYI: All R-134a based systems use 1/2"-16 ACME threaded fittings. Ensure all replacement parts match the connections of the system being worked on.
Always use a new gasket or "O" ring when connecting lines or fittings. Coat "O" ring with refrigerant oil and ensure it is not twisted during installation. Always use 2 wrenches to prevent damage to lines and fittings.
PLACING SYSTEM IN OPERATION
After component service or replacement has been completed and all connections have been made, evacuate system thoroughly with a vacuum pump. Charge system with proper amount of refrigerant and perform leak test. Check all fittings that have been opened. After system has been leak tested, check system performance.
FYI: Most compressors are pre-charged with a fixed amount of refrigerant (shipping) oil. Drain compressor oil from new compressor and add refrigerant oil to new compressor according to amount removed from old compressor. Always refer to underhood AC specification label or AC compressor label while servicing AC system.
CHECKING COMPRESSOR OIL
1. Before checking and adjusting oil level, operate engine at 1200 RPM. Connect manifold gauge set to AC system. Ensure high side pressure is more than 85 psi (6.0 kg/cm2 ). If necessary, cover front face of condenser to raise pressure.
2. Set controls at maximum cooling and high blower motor speed. Operate AC system for 10 minutes to return oil to compressor. Stop engine. Discharge refrigerant. Measure the amount of oil drained/discharged into refrigerant recovery/recycling equipment.
3. Remove compressor from vehicle. Remove compressor drain plug. Drain compressor oil from old compressor and measure oil amount. Add this amount to amount drained in step 2) to obtain total amount drained.
4. Drain oil from new compressor. Fill new compressor with total amount drained from old compressor, using new oil. If any major components of the system were also replaced, determine the amount of additional oil needed.
COMPONENT REFRIGERANT OIL CAPACITIES
- Condenser: 2.5
- Evaporator: 2.5
- Receiver-Drier: 0.2
- Refrigerant Lines (Add only if a refrigerant oil leak is indicated.): 1.0
MANUAL AC SYSTEM SPECIFICATIONS
- Compressor Type: Calsonic V6 6-Cyl.
- Compressor Belt Deflection
- New Belt: 15/64-9/32" (6-7 mm)
- Used Belt: 9/32-5/16" (7-8 mm)
- System Oil Capacity: 6.8 ozs. (Measured at ambient temperature of 77°F (25°C), with 50-70 percent relative humidity.)
- Refrigerant (R-134a) Capacity 29.9-33.4 ozs.
- System Operating Pressures (Use Type "S" Oil (Part No. KLH00-PAGS0).
- High Side: 165-202 psi (11.6-14.2 kg/cm2 )
- Low Side: 19-29 psi (1.3-2.0 kg/cm2 )
To see the original article with images check it out here: Garage411: Nissan 240sx Air Conditioning: compressor oil, lines, fittings and more