Fitting a new compressor

Fitting a new compressor

A new compressor is sealed and pressurised 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 it’s sealing cap in place and must not be removed until immediately prior to fitting.

A new compressor is supplied with an oil fill quantity₃₃ (Xcm ) of 135 cm . A calculated quantity of oil must be drained from a new compressor before fitting.

To calculate the quantity to be drained:

1. Remove the drain plug from the old compressor.
2. Invert compressor and gravity drain the oil into a calibrated measuring cylinder. Rotating the compressor clutch plate will assist complete draining.₃
3. Note the quantity of oil drained (Ycm )
4. Calculate the quantity of oil to be drained from the NEW compressor using the following formula:

Xcm3 - (Ycm3 + 20cm3) = Qcm3

5. Remove drain plug from new compressor and₃ drain Qcm of oil. Fit and tighten compressor drain plug.

Fitting an existing compressor

When refitting an existing compressor a quantity of refrigerant oil equivalent to the amount obtained when the system was discharged must be added to the compressor.

Use only an approved refrigerant lubricating oil:

Sanden SP-10 Unipart SP-10

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.

Refit

1. Fit compressor and manoeuvre onto mounting bracket.
2. Fit 2 upper through bolts and nuts securing compressor to mounting bracket.
3. Fit 2 lower through bolts and nuts securing compressor to mounting bracket.
4. Tighten compressor mounting bolts to 45 Nm.
5. Clean compressor and pipe connections.
6. Remove caps from compressor and pipe connections.
7. Lubricate 2 new ’O’ ring seals with refrigerant oil and fit to compressor.
8. Position air conditioning pipe union to compressor, fit securing bolt and tighten to 45 Nm.
9. Connect multiplug to compressor.
10. Fit alternator. See ELECTRICAL, Repairs.
11. Replace receiver drier. See this section.
12. Remove stand(s) and lower vehicle.
13. Connect battery earth lead.
14. Recharge air conditioning system. See Adjustments.