Volkswagen Workshop Service and Repair Manuals

Special tools, workshop equipment, testers, measuring instruments and auxiliary items required

• ◆ Feeler gauge
• ◆ Wood or plastic wedge

Notes:

• ◆ Renew defective tappet complete (cannot be adjusted or repaired).
• ◆ Irregular valve noises when starting engine are normal.

Test sequence

• ‒ Start engine and run until the radiator fan has switched on once.
• ‒ Increase engine speed to about 2500 rpm for 2 minutes.

If the hydraulic tappets are still noisy, locate defective tappets as follows:

• ‒ Remove cylinder head cover.
• ‒ Rotate crankshaft clockwise, until cam of the tappet to be checked is pointing upwards.
• ‒ Determine play between cam and bucket tappet.
• ‒ If the play is in excess of 0.1 mm, renew bucket tappet. If the play is less than 0.1 mm or no play, proceed with check as follows:

• ‒ → Press tappet down with a wooden or plastic wedge. If free travel in excess of 1 mm is felt before tappet contacts valve, renew
  tappet.

Note:

After installing new tappets the engine must not be started for approx. 30 minutes. Hydraulic compensation elements must settle (otherwise valves will strike pistons).