With R-4 Compressor

The Harrison R-4 compressor is a four cylinder, radial opposed with 10.0 cubic-inch displacement.

V-Groove Pulley Type W/4 Pole Clutch And Driver:

Poly-Groove Pulley Type W/6 Pole Clutch And Driver:

There are two designs of the clutch driver which affect the overhaul procedure. The four pole clutch and the six pole clutch. There are also two types of pulleys used with the R-4 which also affect some procedures.

When servicing the compressor, it is essential that steps be taken to prevent dirt or foreign material from getting on or into the compressor parts and system during disassembly or assembly. Clean tools and clean work area are very important for proper service. The compressor connection areas and the exterior of the compressor should be cleaned off as much as possible prior to any repairs. Parts must be kept clean at all times and any parts to be reassembled should be cleaned with trichloroethane, naphtha, stoddard solvent, kerosene or equivalent solvent and blown dry with dry air. When necessary to use a cloth on any part, it should be of a nonlint producing type.

Compressor Component View:

Although certain service operations can be per- formed without removing the compressor from the vehicle, the operations described here are based on bench repair with the compressor removed from the vehicle. They have been prepared in sequence in order of accessibility of the components.

When the compressor is removed from the vehicle the oil in the compressor must be drained and measured. The oil should then be discarded. If less than 30 ml (1 fl. oz.) is drained from the compressor add 60 ml (2 fl. oz.) of new 525 viscosity oil to the assembly after overhaul. If more than 30 ml (1 fl. oz.) is drained from the compressor, add the same amount of new 525 viscosity oil to the overhauled assembly.