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Home >> Audi >> 2009 >> Q7 4.2 >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 27 (3.0L - Cylinder Head & VALVETRAIN - Engine Code: CATA) >> 15 Cylinder Head, VALVETRAIN >> VALVETRAIN >> Valve Guides, Checking

Valve Guides, Checking

WARNING: This page is about a different variant/trim than selected.

Special tools and workshop equipment required 

Procedure

NOTE:

If valve is replaced during repair, use new valve for measurement.

Due to different stem diameters, only use an intake valve in the intake guide and an exhaust valve in the exhaust guide.

-- Place valve in valve guide.

Fig 1: Determining Valve Rock (Wear Limit)
GWWV15-0133Courtesy of AUDI OF AMERICA, LLC

-- Secure the Dial Gauge - 0-10mm VAS6079 on the cylinder head with the Dial Gauge Holder VW387 as illustrated.

-- Determine tip clearance.

-- If wear limit is exceeded, measure using new valves.

-- Replace the cylinder head if the wear limit is still exceeded.

NOTE:

The valve guides cannot be replaced.