IMRC Housing Assembly Cleaning Procedure

1. The following materials are required for the cleaning procedure: a 1/2 to 1 inch wire stemmed horse hair or nylon bottle cleaner type brush, Ford Carburetor Tune-Up Cleaner (D9AZ-19579-AA) rubber gloves, and eye protection. (Do not use choke cleaner solvents.)

2. Remove IMRC assemblies.

3. Remove E-clip that retains vacuum control linkage to the lever/shaft assembly. Disconnect the vacuum control linkage rod from the lever and verify that the shaft assembly is causing the stick/bind/grab condition. (If the vacuum control is causing the sticking condition, refer to Removal and Installation procedures. Removal and Installation

4. Holding the IMRC assemblies vertical, liberally spray the Carburetor Tune-Up Cleaner into each of the eight bores concentrating the spray at each shaft/journal interface. Spray from both the top and bottom side of the bore, rotating the shaft by hand and pushing end-to-end to work the Carburetor Tune-up Cleaner or equivalent into the journal areas. Soak assemblies for 15 minutes.

5. Saturate the cleaning brush with solvent and scrub between the bores and valve plates. Apply some pressure on the brush while scrubbing, concentrating on the area where the shaft meets the housing journal.

6. Spray Carburetor Tune-Up Cleaner or equivalent on the bores, plates, and shaft as needed to wash away any residue.

7. Use shop air to blow away the remaining residue. Concentrate on blowing the residue out of the shaft/journal area.

8. The shaft should now rotate freely without sticking or binding.

NOTE: If the IMRC assemblies have been properly cleaned following the above procedure and still do not rotate freely, replace complete IMRC assemblies.

9. Reinstall the vacuum control linkage rod through the lever and replace the E-clip.

10. Apply 10 in-Hg vacuum to the Vacuum control inlet port and verify the valve plates rotate to the closed position. Release vacuum. Plates should rotate quickly and freely to the open position. Repeat several times to verify freedom of movement.

NOTE: If plates do not rotate freely in response to vacuum signal, replace the complete IMRC assembly.