Refrigerant Oil Addition

OIL TYPE
The 10PA17 compressor uses a unique special quality refrigerant oil, (Part No. E73Z-19577-A) Motorcraft Part No. YN-9 or an equivalent refrigerant oil meeting Ford Specification ESH-M2C31-A2. An oil charge of 237 ml (8 ounces) is used in a new system. It is extremely important that only the specified type and quantity of refrigerant oil be used in the 10PA17 compressor. If there is a surplus of oil in the system, it will circulate with the refrigerant, reducing the cooling capacity of the system. Too little oil or the use of an oil not meeting specification will result in poor lubrication of the compressor.

OIL REPLACEMENT
When it is necessary to replace a component of the refrigerant system, the procedures must be followed to assure that the total oil charge in the system is correct after the new part is installed. 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 of the system is removed after the system has been operated, some oil will go with it. To maintain the original total oil charge, it is necessary to compensate for this by replacing the oil in the new replacement part.

PROCEDURE
The procedures for replacing refrigerant oil are as follows:

During Compressor Replacement

NOTE: A new service replacement 10PA17 compressor contains 237 ml (8 ounces) of refrigerant oil.

1. When replacing the compressor, remove as much oil as possible. The shaft should be rotated about 6 to 8 revolutions while pouring the oil from the ports. This effectively empties the compressor of oil.
a. Obtain a clean container that can also be used as a measuring device.
b. Place the clutch hub assembly on the compressor shaft so the shaft can be rotated.
c. Rotate the shaft by hand 6 to 8 revolutions, collection the oil in the clean measuring device.
2. If the amount of oil drained from the old compressor was between 89 and 148 ml (3 and 5 ounces), pour the same amount of clean refrigerant oil into the new compressor.
3. If the amount of oil that was removed from the old compressor is greater than 148 ml (5 ounces), pour 148 ml (5 ounces) of clean refrigerant oil into the new compressor.
4. If the amount of refrigerant oil that was removed from the old compressor is less than 89 ml (3 ounces), pour 89 ml (3 ounces) of clean refrigerant oil into the new compressor. This will maintain the total system oil charge within specification.

NOTE: The suction/accumulator drier and the orifice tube should also be replaced whenever the compressor is replaced.

During Component Replacement
1. When replacing other components of the air conditioning system, measured quantities of the specified refrigerant oil should be added to the component to ensure that the total oil charge in the system is correct before the system is operated.
2. Clean refrigerant oil should be added to the replacement components as follows:
a. Evaporator Core: Add 90 ml (3 fluid ounces).
b. Condenser: Add 30 ml (1 fluid ounce).
c. Accumulator: Drain oil from removed accumulator/drier. Add same amount plus 60 ml (2 fluid ounces) of clean refrigerant oil to new accumulator.
3. Clean refrigerant oil should be poured directly into the replacement component.
4. If any other components such as an orifice tube or a hose is replaced, no additional refrigerant oil is necessary unless a hose bursts with a fully charged system. Then the addition of refrigerant oil may be necessary with the amount to be determined by the technician. The suction/accumulator drier should also be replaced under these circumstances.