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Calculating Maximum Permissible Machining Dimension Audi TT 8N facelift

Mechanical 1 illustration ~123 words
  1. Insert valve and press firmly against valve seat.

Note. If a valve has to be replaced as part of a repair, use the new valve for the measurement.

Scheme 339

Scheme 339
Scheme 339
  1. Measure distance -a- between end of valve stem and upper cylinder head surface with a depth gauge.
  2. Calculate maximum permissible machining dimension using measured distance and minimum dimension.
Short intake valveLong intake valveShort exhaust valveLong exhaust valve
31.8 mm10.2 mm31.8 mm10.2 mm

MEASURED DISTANCE & MINIMUM DIMENSION SPECIFICATIONS

Distance measured minus minimum dimension = maximum permissible machining dimension.

Distance measured10.6 mm
Minimum dimension10.2 mm
=Maximum allowable machining dimension0.4 mm

MAXIMUM PERMISSIBLE MACHINING DIMENSION CALCULATION: EXAMPLE

Note. If the maximum allowed machining dimension is 0 mm or less than 0 mm, repeat the measurement using new valve. If the measurement result is still 0 mm or less than 0 mm, replace the cylinder head.