Piston Projection, Measuring At TDC

Special tools and workshop equipment required 

• Measuring Bar :VW 382/7 
  Fig 1: Identifying Measuring Bar VW 382/7

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• Measuring Set - Magnetic Plate - 50mm :VW 385/17  from Measuring Set :VW 385 
  Fig 2: Identifying Measuring Set - Magnetic Plate - 50 mm VW 385/17

  Courtesy of AUDI OF AMERICA, LLC
• Dial Indicator - 0-10mm :VAS 6079 
  Fig 3: Dial Gauge

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Procedure 

Fig 4: Identifying Measuring Bar VW 382/7 And VW 385/17 On Cylinder Block

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-- Secure the Dial Gauge - 0-10mm :VAS 6079  with the Measuring Bar :VW 382/7  and Measuring Set - Magnetic Plate - 50mm :VW 385/17  to the cylinder block, as shown.

-- Measure the projecting end on each piston at both spots identified with -arrows- (longitudinally on the engine: at the front and back of the piston).

-- Depending on the piston projection, install the corresponding cylinder head gasket according to the following table:

Cylinder Head Gasket Identification

Fig 5: Head Gasket

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1. Part Number
2. Ignore
3. Holes

TIP:

If varying values occur when measuring the projecting end, use the cylinder head gasket for the largest value.