Air Injection Check Valve: Service and Repair

Left Side Air:

Right Side Air:

REMOVAL PROCEDURE - BANK 1

1. Check valve clamp.
2. Hose from check valve.
3. Left check valve pipe.
4. Unscrew check valve from air injection pipe.
5. Before replacing a check valve, test the valve for proper operation.
- Install a vacuum pump to the nipple side of the check valve, AIR pump side.
- Pump the vacuum pump to 10 inches Hg. and observe the guage.
- If the vacuum bleeds down to zero within 5 seconds, replace the check valve.

INSTALLATION PROCEDURE

1. Screw check valve onto air injection pipe.

Tighten
Valve to 23 Nm (17 lb ft).

2. Air pipe to exhaust manifold.
3. Air hose to check valve.
4. Check valve clamp.

REMOVAL PROCEDURE - BANK 2

Remove or Disconnect

1. Clamp and air hoses from AIR system right pipe.
2. Check valve clamp.
3. Right check valve pipe.
4. Unscrew check valve from air injection pipe.

INSTALLATION PROCEDURE

1. Screw check valve onto air injection pipe.

Tighten
Valve to 23 Nm (17 lb ft).

2. Check valve pipe and clamp.
3. Check AIR system for proper operation.