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Home >> GMC >> 1974 >> Magnavan >> Repair and Diagnosis >> Engine Performance >> Specifications >> ROCHESTER Models 4MC & 4MV 4-Barrel >> Overhaul >> Cleaning And Inspection

Cleaning And Inspection

  1. No rubber parts, plastic parts, diaphragms or pump plungers should be immersed in carburetor cleaner. However, the plastic cam on the air valve shaft may be cleaned normally in carburetor cleaner.
  2. If air valve or cam are damaged, or air valve is binding, air horn assembly must be replaced. After cleaning parts in a suitable carburetor cleaner, rinse all parts as directed by carburetor cleaner manufacturer. Dry all parts and blow out all passages with compressed air.
  3. When cleaning or overhauling a carburetor, identify the carburetor by the code stamped adjacent to the fuel inlet and order a complete Repair Kit for the carburetor being worked on. Check all valves and shafts for binding or damage.