The UK quattro Network

Type 44 - Checking and adjusting valve clearances

Engines without hydraulic tappets

• Clearance is checked and adjusted with the engine warm (coolant above 35°C - cylinder head warm)
  
  Specified settings:
  
  Inlet valves 0.20 to 0.30 mm
  Exhaust valves 0.40 to 0.50 mm
  
  (Try to set to the mean value)

Warm tappet worksheet

It is not always possible to measure the tappets with the engine warm, e.g., if it has already been dismantled and it is desired to reassemble it it correctly:

Cold tappet worksheet

Work sequence Turn crankshaft until cams of cylinder to be set are pointing upwards uniformly Check clearance between camshaft and bucket tappet e.g. on 4 cylinder engine A - exhaust valve E = inlet valve If clearance is outside tolerance, adjust to mean value by changing shims Shims are available in thicknesses from 3.00 to 4.52 mm in steps of 0.05 mm. The marking on the shim must face downwards, i.e., into the bucket

Press the tappet down with 2078 Remove shim with pliers 10-208A Insert shim of required thickness. Used shims can be reinstalled provided they are undamaged Install a new cylinder head cover gasket and rubber seal on camshaft bearing cap #1

Note for Diesel engines:
When pressing down the tappet, the piston must not be at TDC. Rotate the crankshaft approximately 1/4 turn beforehand so that the valves do not contact the pistons when the bucket tappets are pressed down.

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