Engine Controls - Remove/install/overhaul: Overhaul Chevrolet Pickup K2500

Disassembly (Throttle Body Cover Model 220)

1. Place throttle body on Holding Fixture (J-9789-118 or BT-30-15) to prevent damage to throttle valve. Remove cover-to-throttle body screws (note location of 2 short screws). Remove throttle body cover. see scheme 3 Throttle body cover and pressure regulator are serviced as an assembly. DO NOT remove pressure regulator-to-cover screws.
2. Remove TP sensor, IAC, fuel injectors, fuel filter, rubber parts, and diaphragms. Clean all remaining (metal) parts in a cold immersion-type cleaner such as Carbon X (X-55). Blow dry with compressed air. Inspect mating surfaces for damage which may prevent gasket sealing. Repair or replace faulty components.

Disassembly (Fuel Meter Assembly Model 295)

1. Place throttle body on Holding Fixture (J-9789-118 or BT-30-15) to prevent damage to throttle valve. Remove cover-to-throttle body screws (note location of 2 short screws). Remove throttle body cover. see scheme 3 If fuel pressure regulator cover is removed, regulator diaphragm must be replaced to prevent fuel leaks.
2. Remove TP sensor, IAC, pressure regulator assembly, fuel injectors, fuel filter, rubber parts, and diaphragms. Clean all remaining (metal) parts in a cold immersion-type cleaner such as Carbon X (X-55). Blow dry with compressed air. Inspect mating surfaces for damage which may prevent gasket sealing. Repair or replace faulty components.

Reassembly (Fuel Meter Assembly)

1. Install NEW dust seal into recess of throttle body. Install fuel outlet passage gasket on cover. Install throttle body cover gasket on throttle body. Install TP sensor, IAC, fuel injectors, injectors and diaphragms.
2. On TBI 295, install pressure regulator assembly. On all models, apply locking thread compound to cover attaching screws. Install cover screws and lock washers. Tighten screws. Connect electrical lead to fuel injectors, and install air cleaner.

Disassembly & Reassembly

1. Disassembly procedure is not available from manufacturer. (Scheme 8)for exploded views of distributors.
2. When reassembling, ensure pick-up assembly arm is correctly installed on pin. If not, arm can float and cause ignition timing to vary. To prevent corrosion, lubricate terminals with petroleum jelly before installation.
3. To prevent heat damage, coat bottom of module and module rest pad in distributor housing with silicone grease. Before installing roll pin in driven gear, ensure timing mark on roll pin and rotor tip align. (Scheme 8)

Scheme 8