Discovery I (LJ) V8-4.0L (1996)
Refrigerant Oil: Service and Repair
Refrigerant oil
Use the approved refrigerant lubricating oil:
Nippon Denso ND-OIL 8
Unipart R134a ND-OIL8
CAUTION: Do not use any other type of refrigerant oil.
Refrigerant oil easily absorbs water and must not be stored for long periods. Do not pour unused oil back into the container.
When renewing system components, add the following quantities of refrigerant oil:
Condenser
40 ml
Evaporator
80 ml
Pipe or hose
20 ml
Receiver/drier
20 ml
Total of refrigerant oil in system = 180 ml = 6.3 FI oz
A new compressor is sealed and pressurized with Nitrogen gas, slowly release the sealing cap, gas pressure should be heard to release as the seal is
broken.
NOTE: A new compressor should always have its sealing caps in place and must not be removed until immediately prior to fitting.
Fitting a new compressor
A new compressor is supplied with an oil fill (X) of: 180 ml
A calculated quantity of oil must be drained from a new compressor before fitting.
To calculate the quantity of oil to be drained:
1. Remove sealing plugs from the OLD compressor
2. Invert compressor and gravity drain oil into measuring cylinder. Rotating the compressor clutch plate will assist complete draining.
3. Note the quantity of oil drained (Y).
4. Calculate the quantity (Q) of oil to be drained from the NEW compressor using the following formula:
X-(Y+20 ml)=Q
Rapid refrigerant discharge
When the air conditioning system is involved in accident damage and the circuit is punctured, the refrigerant is discharged rapidly. The rapid discharged
of refrigerant will also result in the loss of most of the oil from the system. The compressor must be removed and all the remaining oil in the compressor
drained and refilled as follows:
1. Gravity drain all the oil, assist by rotating the clutch plate (not the pulley).
2. Refill the compressor with the following amount of new refrigerant oil:
130 ml
3. Plug the inlet and outlet ports.