Piston Projection, Measuring At Top Dead Center (TDC): Notes
WARNING: This page is about a different car, the 2016 Audi A6 Quattro. However, it is still accessible from the selected car via links, so may be relevant.
Special tools and workshop equipment required
- Measuring Bar :VW382/7 from the Special Socket & Measuring Tools :VW382
- Measuring Set - Magnetic Plate - 50mm :VW385/17 from Measuring Set :VW385
- Dial Gauge - 0-10mm :VAS6079
NOTE:
Measure the piston projection at "TDC" whenever installing a new piston or new part of the engine.
-- Secure the :VAS6079 with the :VW382/7 and :VW385/17 to the cylinder block, as illustrated.
-- Measure the projection on each piston at both spots identified with -arrows- (at the front and back of the piston).
NOTE:
If varying values occur when measuring the projection, use the gasket for the largest value.
The cylinder head gasket must be determined for each cylinder bank removed.
-- Depending on the piston projection, install the correct cylinder head seal according to the following table:
| Piston Projection Above the Upper Edge of the Cylinder Block | Identification Holes |
|---|---|
| 0.82 to 0.92 mm | 1 |
| 0.92 to 0.97 mm | 2 |
| 0.97 to 1.08 mm | 3 |