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    1948 Oldsmobile Dynamic 76 3.9L 1BL 6cyl

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    A/C Compressor and Clutch


    Only EPA-certified technicians can purchase R-12 refrigerant, since proper recovery and recycling techniques are required to prevent damaging the environment. Improper disposal of R-12 refrigerant can result in a fine.

    a system with r-12 refrigerant can be Retrofit to use r-134a refrigerant.
    Parts of the clutch and compressor.


    • Purge the system of refrigerant (If your car uses R-12 refrigerant, this step should be perform by an EPA-certified technician for proper recovery and recycling).
    • Disconnect the battery ground cable.
    • Remove the inlet and outlet hoses or the service valves from the compressor.
    • Remove the clutch lead wire.
    • Loosen and remove the belt(s).
    • Remove the mounting bolts from the compressor brackets and braces and lift the compressor from the car.


    • Remove the compressor and clutch assembly.
    • Remove the pulley and bearing assembly.

    Shaft Seal

    • Using snap-ring pliers, remove the seal retaining snap ring.
    • Remove the seal seat using the seal seat remover and installer.
    • Remove the seal, using the seal remover tool.
    • Remove the shaft seal seat O-ring using the O-ring remover.
    • Flush the seal cavity with refrigeration oil.
    • Coat the new seal parts with refrigeration oil.
    • Install the new shaft seal O-ring. Make sure it is properly seated in the internal groove. Use the remover tool to position the O-ring properly.
    • Install the seal protector or dust cover on the compressor crankshaft.
    • Lubricate the part liberally with clean refrigeration oil.
    • Place the new shaft seal in the seal installer tool and carefully slide the shaft seal into place in the inner bore.
    • Rotate the shaft seal clockwise until is seats on the compressor shaft flats.
    • Rotate the tool counterclockwise until it seats on the compressor shaft flats.
    • Rotate the tool counterclockwise to remove the seal installer tool.
    • Remove the the shaft seal protector.
    • Place the shaft seal seat on the remover/installer tool and carefully reinstall in the compressor seal cavity.
    • Replace the seal seat retainer.

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