Cylinder Head, Removing and Installing Audi A4 B6

Note. Replace cylinder head bolts. Replace self-locking nuts and bolts during assembly work. Always replace bolts that are secured with tightening torque as well as O-rings and gaskets. After installing a replacement cylinder head with camshafts installed, oil contact surfaces between valve lifters and cam lubricating surfaces after installing cylinder head. Do not remove plastic bases protecting exposed valves until immediately before installing cylinder head. When replacing the cylinder head or cylinder head gasket, coolant must be completely replaced. If a cylinder head is replaced, a cap must be driven in on the front part of the respective head. See SEALING CAP (CORE PLUG) IN CYLINDER HEAD, DRIVING IN . Cylinder heads with cracks between valve seats or between valve seat and spark plug thread can still be used without loss of service life if the cracks are minute (max. 0.3 mm width) or only the first four threads of a spark plug thread are cracked.