Hydraulic valve lifters, checking
Special tools, testers and auxiliary items required
Feeler gauge
Wooden or plastic wedge
Work sequence
Start engine and run until coolant temperature reaches approx. 80 °C.
Increase engine speed to about 2500 RPM for 2 minutes, if necessary perform test drive.
If hydraulic lifters are still noisy, locate faulty lifters as follows:
Remove cylinder head cover --> Cylinder head cover, removing and installing.
Rotate crankshaft until lobes on cams of lifters to be checked are pointing upward:
Vehicles with manual transmission:
Push vehicle forward with 4th gear engaged and ignition switched off.
Vehicles with automatic transmission:
Remove sound insulation and turn crankshaft clockwise by applying wrench to central bolt on crankshaft
sprocket.
Measure play between cam and valve lifter.
Fig. 212: Pressing Valve Lifter Down With Wooden Or Plastic Wedge
Courtesy of VOLKSWAGEN UNITED STATES, INC.
NOTE:
Hydraulic valve lifters cannot be repaired.
Irregular valve noises when starting engine are normal.
2005 Audi A4 Quattro
ENGINE 1.8 Liter 4-Cyl. 5V Turbo Engine Mechanical, Engine Code(s): AMB
1:01:06 AM Page 142
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