lemon-mirror:
Home >> Audi >> 1978 >> 5000 Automatic Trans >> Repair and Diagnosis >> Engine Performance >> Tune-Up >> Tune-Up Procedures >> Valve Clearance

Valve Clearance

  1. Adjust valves with engine at normal operating temperature. Remove accelerator linkage and cylinder head cover. Clearance adjustments are to be checked and made according to firing order sequence (1-2-4-5-3).
  2. Rotate crankshaft until cam lobes for No. 1 cylinder valves point upward; then measure valve clearances of No. 1 cylinder. If adjustment is necessary, use Disc Remover (US 4476) and Tappet Depressor (VW 2078) to remove and install adjusting discs.
  3. Turn tappet until notches are at 90 degrees to camshaft. Insert tappet depressor and depress tappet. Using disc remover, grasp tappet disc and rotate it out from under camshaft.
  4. Thickness is stamped on bottom side of disc. Using clearance measurement, determine thickness of adjusting disc necessary to bring valve clearance within specifications. Discs are available in 0.0019" (0.05 mm) increments from 0.1181 - 0.1673" (3.0 - 4.25 mm). Repeat procedure as required for remaining valves.
VALVE CLEARANCE SPECIFICATIONS

Application Clearance
All Models
  Intake .008-.012" (.2-.3 mm)
  Exhaust .016-.020" (.4-.5 mm)