Audi Workshop Service and Repair Manuals > A4 Mk2 > Power unit | 4-cylinder direct petrol injection engine (2.0 ltr. 4-valve turbo), mechanics | Engine cylinder head, valve gear | Servicing valve gear

Checking valve guides

Special tools and workshop equipment required

t	Universal dial gauge bracket -VW 387-

t	Dial gauge -VAS 6079-

Test sequence

–	Insert valve into guide. Valve stem end must be flush with guide. Only insert inlet valve into inlet guide and exhaust valve into exhaust guide, as the stem diameters are different.

–	Measure the amount of sideways play.

Wear limit

Inlet valve guide	Exhaust valve guide
0.80 mm	0.80 mm

Note

t	If the wear limit is exceeded, repeat the measurement with new valves. Renew cylinder head if wear limit is still exceeded.

t	If the valve has to be renewed as part of a repair, use a new valve for the measurement.

Audi Workshop Service and Repair Manuals