Inlet and exhaust valves

4.1 Checking valve guides

Special tools and workshop equipment required

• Universal dial gauge bracket - VW 387-

• Dial gauge - VAS 6079-

Test sequence

• Insert valve in guide. Valve stem end must be flush with guide. On account of differing stem diameters, only use inlet valve in inlet valve guide and exhaust valve in exhaust valve guide.
• Determine rock.

• Wear limit: 0.5 mm.

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

4.2 Checking valves

• Check for scoring on valve stems and valve seat surfaces.
• Exchange valve if significant scoring can be seen.

4.3 Valve dimensions