Audi AMB Service Manual page 106

ENGINE 1.8 Liter 4-Cyl. 5V Turbo Engine Mechanical, Engine Code(s): AMB
CYLINDER HEAD, REMOVING AND INSTALLING
Cylinder head, removing and installing
CAUTION: Before beginning repairs on the electrical system:
Obtain the anti-theft radio security code.
Switch the ignition off.
Disconnect the battery Ground (GND) strap.
On vehicles equipped with Audi Telematics by OnStar, switch-off the
emergency (back-up) battery for the Telematic/Telephone Control Module
prior to disconnecting vehicle battery --> 91 - COMMUNICATION
After reconnecting vehicle battery, re-code and check operation of anti-
theft radio. Also check operation of clock and power windows according
to Repair Article and/or Owners Manual.
After reconnecting vehicle battery on vehicles equipped with Audi
Telematics by OnStar, switch-on the emergency (back-up) battery for the
Telematic/Telephone Control Module --> 91 - COMMUNICATION
Cylinder head, removing and installing
NOTE:
Replace cylinder head bolts.

When performing repairs, replace seals, gaskets, self-locking nuts and

bolts which have a specified tightening angle.
Charge air hose connections and hoses must be free from oil and grease

before installing.
When installing a replacement cylinder head with camshafts installed,

contact surfaces between valve lifter and cam running surface must be
oiled after installation of cylinder head.
The plastic protectors installed to protect open valves must only be

removed immediately before installing cylinder head.
When replacing cylinder head or cylinder head gasket, the coolant must be

completely replaced.
Cylinder heads which have cracks between valve seats or between valve

seat inserts and the spark plug thread can be used further without
reducing service life, provided cracks do not exceed a max. of 0.3 mm in
width, or when no more than first 4 turns of spark plug threads are
cracked.
Part I
2005 Audi A4 Quattro
1:01:00 AM Page 94