ROCHESTER 1ME Single Barrel: Overhaul: Reassembly

Use new gaskets and seals. Make sure that new gaskets fit correctly and that all holes and slots are punched through and correctly located. To reassemble carburetor, reverse disassembly procedure noting the following:

1. Adjust float level and metering rod before installing air horn. All other adjustments are made with carburetor assembled.
2. Install metering rod with spring above power piston.
3. Thermostatic spring in idle compensator must hold valve closed after installation. Replace unit if spring is bent or distorted. Do not attempt to straighten or adjust spring.
   Fig 1: Exploded View Of Rochester Model 1 ME Single Barrel Carburetor

   Courtesy of GENERAL MOTORS COMPANY
4. Install seals in float bowl on California models to seal power piston drive rod and pump lever. These seals prevent the escape of fuel vapors.
5. Use 2 tapered head screws for mounting and locating diaphragm bracket. Install and tighten air horn screws evenly and in sequence. See Fig 2.
6. If choke coil cover was removed. It will be necessary to install replacement rivets supplied in service kit. Do not use a gasket between choke housing and cover; direct contact is needed to ground electric coil housing.
7. Place fast idle screw on high step of fast idle cam. Install choke coil cover, aligning notch in cover with raised boss on housing cover flange. Install self-tapping screws and tighten.
8. Install vacuum diaphragm hose to diaphragm tube and connect to vacuum extension on bowl.
9. When installing carburetor on intake manifold, install insulator, then carburetor. Tighten nuts alternately to 37 INCH lbs. (4 N.m) and then tighten to 16 ft. lbs. (22 N.m).
   Fig 2: Air Horn Tightening Sequence

   Courtesy of GENERAL MOTORS COMPANY

   Tighten bolts in clockwise direction