Audi Workshop Service and Repair Manuals

Piston

• ‒ → Fitting position -arrow- must always point towards oil pump.
• ‒ Mark cylinder no. on piston crown with water proof felt pen.

Note:

• ◆ Do not make any chisel punch marks as the piston is coated.

→ Check piston diameter.

• ‒ Measure approx. 10 mm from lower edge 90°offset to piston bolt axis.
• ‒ Deviation compared to specified dimension max. 0.04 mm

→ Piston ring height clearance

• ‒ New: 0.02 to 0.08 mm.
• ‒ Wear limit: 0.1 mm

→ Check touch clearance of piston ring.

• ‒ Insert piston ring at right angles into the bottom cylinder opening, about 15mm from the edge of the cylinder.