Supercharger Intercooler Pressure Testing

Special Tools

• EN-48974  Adapter Kit
• J 46091  Charge Air Cooler Tester

  For equivalent regional tools, refer to Special Tools .

Fig 1: Identifying J 46091-1 Components
Courtesy of GENERAL MOTORS COMPANY
WARNING:

Do not apply greater than 69 kPa (10 psi) to the supercharger intercooler, this may damage the charge air cooler and other internal components within the intercooler.

1. Rotate the regulator knob (3) counterclockwise until stop to reduce pressure to 0 kPa (0 psi).
2. Connect the J 46091-1 to a shop air source (1).
Fig 2: Supercharger Intercooler Pressure Testing Kit & Components
Courtesy of GENERAL MOTORS COMPANY
3. Install the EN-48974  kit adapter hose (1), cap (2) and clamps (3) to the coolant inlet and outlet connections of the intercooler water manifold. Tighten the clamps until snug.
Fig 3: Supercharger Intercooler Pressure Testing Kit
Courtesy of GENERAL MOTORS COMPANY
4. Install the J 46091-1 to the EN-48974  kit adapter hose.
5. Rotate the knob of the regulator slowly clockwise to increase pressure.
NOTE:

The gauge value should not exceed 69 kPa (10 psi). Adjust the pressure regulator as required.

6. With the intercooler pressurized to 69 kPa (10 psi) maximum, close the air inlet valve of the J 46091-1.
7. Inspect for a drop in air pressure on the gauge.
   • If a drop in pressure is noted, inspect for leaks at the tool connections, the charge air coolers, service bleed ports, assembly plant fill port, and water manifold-to-charge air cooler seal locations.
   • If no drop in pressure is noted, the intercooler can be installed onto the engine assembly.