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Home >> Audi >> 2016 >> S5 Prestige, 2D Convertible >> Repair and Diagnosis >> External Pages >> Different car >> Section 2 (1.8L - Turbo Engine Mechanical, Engine Code(S): AMB) >> 15 - Engine - Cylinder head, Valvetrain >> Valve gear, servicing >> Valve seats, refacing >> Notes

Valve seats, refacing: Notes

WARNING: This page is about a different car, the 2006 Audi A4, 2005 Audi A4, 2004 Audi A4, and 2003 Audi A4. However, it is still accessible from the selected car via links, so may be relevant.
NOTE:
  • If a good seating pattern cannot be obtained by lapping valve seats, they must be refaced.

Special tools, testers and auxiliary items required 

NOTE:
  • When repairing engines with leaking valves, it is not sufficient to reface valve seats and replace valves. Valve guides must also be checked for wear. This is particularly important on high mileage engines → Valve guides, checking .
  • Valve seats should only be refaced just enough to produce a perfect seating pattern.
  • Calculate the maximum permissible refacing dimension before refacing.
  • If refacing dimension is exceeded, function of hydraulic valve lifters can no longer be guaranteed and cylinder head should be replaced.
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