GM 12565503
Check Valve

Start servicing and repairing bank 2 air injection check valve by first taking off the Intake Manifold when the engine has sufficiently cooled. Removing the service starts by detaching clamps and air hoses from right pipe before unscrewing the Cylinder Head bolt to eliminate the right air pipe from the manifold. Check valve testing requires application of air pumps to the nipple side of the check valve where pressure reaches 10 inches hg and performance evaluation determines replacement if the vacuum reaches zero in under 5 seconds. The check valve installation requires mating it with the air pipe followed by torquing it to 23 n.m (17 lb ft). Connect and tighten the right air pipe to the Exhaust Manifold at 20 n.m (15 lb ft). After that, install the Cylinder Head air pipe bolt and clamp the hose to the check valve. After reinstalling the Intake Manifold technicians must check the air system operation and complete the Battery Cable reconnection steps and idle learn process with transmitter programming.

Service the bank 1 air injection check valve by removing its clamp while practicing engine safety. Dismantle the check valve from both the air pipe through removal of the Air Hose. The left air pipe must be detached from its position on the manifold. Technicians should test the check valve before replacing it by connecting a Vacuum Pump to the air pump side nipple and pumping the system up to 10 in hg vacuum pressure to monitor the gauge reading. Check valve replacement is necessary if pressure drops to zero within five seconds. To perform installation attach the check valve to the air pipe and fasten it until torque reaches 23 n.m (17 lb ft). Employ a torque of 20 n.m (15 lb ft) when you install the air pipe to the Exhaust Manifold. The final step comprises attaching the Air Hose to the check valve before tightening it with a check valve clamp.

You should begin the bank 2 Secondary Air Injection Check Valve/pipe replacement process by removing the Intake Manifold after engine cooling to avoid burns. Start by unfastening the clamps and air pipes from the air system right pipe after that remove the air pipe bolt from the Cylinder Head followed by removing the right air pipe from the manifold. You should test the check valve operation by connecting a Vacuum Pump to the check valve nipple side and pumping until the gauge reaches 10 inches hg then observe the gauge; replace the check valve if it bleeds down to zero vacuum during 5 seconds. The installation process requires fitting the check valve onto the air pipe before tightening it to 23 n.m (17 lb ft). Install the right air pipe on the Exhaust Manifold while tightening it to 20 n.m (15 lb ft) before adding the air pipe bolt from the Cylinder Head and securing the hose and clamp to the check valve. Install the Intake Manifold alongside checking the air system functionality before completing the procedure with connecting the negative Battery Cable and programming the transmitters.

The first step to replace the bank 2 Secondary Air Injection Check Valve/pipe requires removing the Intake Manifold while monitoring for the air temperature caution. Detach the clamps and air hoses from the air system right pipe and afterwards remove the air pipe bolt from the Cylinder Head to extract the right air pipe from the manifold. Begin operation testing on the check valve of the air pipe after unscrewing it by attaching a Vacuum Pump to the nipple side of the check valve on the air pump side and reaching 10 inches hg pressure and observing the gauge; the vacuum should bleed down to zero within 5 seconds to confirm valve replacement. You should install the check valve onto the air pipe by tightening it using 23 n.m (17 lb ft) torque. Install the right air pipe to the Exhaust Manifold before securing it to 20 n.m (15 lb ft), afterward position the air pipe bolt from the Cylinder Head and complete installation with a check valve hose and clamp before reinstalling the Intake Manifold. Operating the air system can be checked before reinstallation of the negative Battery Cable to follow by idle learn procedure and transmitter programming.

Install the AIR pump shut off valve.

Unscrew the check valve from the AIR pipe and remove the left AIR pipe from the manifold.

Remove the intake manifold, ensuring the engine is cool to prevent burns.

Remove the check valve clamp, ensuring the engine has cooled to prevent burns.

Reinstall the AIR pipe bolt from the cylinder head, attach the hose and clamp to the check valve, and finally reinstall the intake manifold.