Evaporative Check Valve: Testing and Inspection

Non-Return Valve A/B Inspection/Replacement

Special Tools Required

- Vacuum Pump/Gauge, 0-30 inHg Snap-on YA4000A or equivalent, commercially available

Inspection

1. Remove the non-return valve.

2. Connect a vacuum pump/gauge, 0-30 inHg, to the non-return valve as shown. Note the direction of the arrow on the valve.





3. Apply vacuum to the valve.

- If it holds vacuum, go to step 4.
- If it does not hold the vacuum, replace the non-return valve.

4. Connect the vacuum pump/gauge to the non-return valve as shown. Note the direction of the arrow on the valve.





5. Apply vacuum to the valve.

- If it holds vacuum, replace the non-return valve.
- If it does not hold the vacuum, the non-return valve is OK.

Non-Return Valve A Replacement

1. Remove the charge air cooler cover.

2. Disconnect the hoses, then remove non-return valve A.





3. Install the parts in the reverse order of removal.

NOTE: Make sure the arrow on the valve points in the correct direction.

Non-Return Valve B Replacement

1. Remove the air cleaner Service and Repair.

2. Remove the air bypass outlet pipe Service and Repair.

3. Disconnect the hoses, then remove non-return valve B.





4. Install the parts in the reverse order of the removal.

NOTE: Make sure the arrow on the valve points in the correct direction.