Volkswagen Workshop Service and Repair Manuals

Check non-return valve for crankcase breather Special tools and workshop equipment required

t  Hose clip pliers -VAS 6340-

t  Hand vacuum pump -VAS 6213- Test prerequisite The arrows on the non-return valve -2- must point towards the engine. Test procedure

–  Apply the hose clip pliers -VAS 6340- as shown to the hose clip and open the clip at the same time using a screwdriver -1-.

–  To check non-return valve -2-, remove hose clip -1- and disconnect breather hose from intake hose connector. –  Connect hand vacuum pump -VAS 6213- to breather hose -1-.

–  Push the hand vacuum pump -VAS 6213- switch ring in -the direction of arrow B-. –  Operate hand vacuum pump -VAS 6213-. No pressure should build up, the non-return valve -2- is open.

–  Push the hand vacuum pump -VAS 6213- switch ring in -the direction of arrow A-. –  Operate hand vacuum pump -VAS 6213- until a pressure of 0.70 bar is attained on pressure gauge.   Note The non-return valve will open at a pressure of 0.80 bar. If a pressure of 0.70 bar cannot be created: –  Replace the non-return valve -1-.