Volkswagen Workshop Service and Repair Manuals

Note:

The smallest mal-adjustment of the fuel delivery adjusting screw can cause sooting or loss of engine power. Therefore it is important that the adjusting screw is re-installed in the same position. On no account may the fuel delivery adjusting screw be screwed in past the original position.

Work sequence

• ‒ → Mark position of fuel delivery adjusting screw relative to pump cover, e.g. slot of screw relative to pump cover -arrows-.
• ‒ Loosen locking nut against locking sleeve and unscrew fuel delivery adjusting screw from pump cover.
• ‒ Renew O-ring.
• ‒ Screw in delivery adjusting screw as illustrated.
• ‒ Run engine until warm and check idling speed and engine governed speed.
• ‒ Check exhaust gas opacity with combustion tester V.A.G 1500

=> Fault finding programme Diesel engine No. 2 "excessive black exhaust smoke".