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Home >> Audi >> 2016 >> S5 Prestige, 2D Convertible >> Repair and Diagnosis >> External Pages >> Different car >> Section 6 (4.2L - Engine Mechanical, Engine Code(S): BHF) >> 15 - Engine - Cylinder head, Valvetrain >> Valvetrain, servicing >> Valve seats, refacing >> Notes

Valve seats, refacing: Notes

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NOTE:
  • If a perfect contact pattern is not achieved by grinding the valve seats, reface the valve seats.

Special tools, testers and auxiliary items required 

NOTE:
  • When repairing engines with leaking valves, it is not sufficient to rework or replace valve seats and valves. It is particularly important to check valve guides for wear on engines with higher mileage → Valve guides, checking 
  • Only reface valve seats enough until a perfect contact pattern is obtained.
  • Before refacing, determine maximum refacing dimension.
  • If refaced dimension is exceeded, hydraulic valve lifter function is no longer guaranteed and cylinder head must be replaced.
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