A4 Cabriolet L4-1.8L Turbo (AMB) (2005)
Lifter / Lash Adjuster: Testing and Inspection
Hydraulic valve lifters, checking
Special tools and repair equipment required
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Feeler gauge
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Wooden or plastic wedge
Note:
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Hydraulic valve lifters cannot be repaired.
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Irregular valve noises when starting engine are normal.
Work sequence
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Start engine and run until coolant temperature reaches approximately 80°C.
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Increase engine speed to about 2500 RPM for 2 minutes, if necessary perform test drive.
Note: If irregular valve noises stop but recur repeatedly during short trips, oil retention valve must be replaced. Location of oil retention valve: in oil
filter holder -6-.
If hydraulic lifters are still noisy, locate faulty lifters as follows:
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Remove cylinder head cover.
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Rotate crankshaft until lobes on cams of lifters to be checked are pointing upward:
Vehicles with manual transmission:
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Push vehicle forward with 4th gear engaged and ignition switched off.
Vehicles with automatic transmission:
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Remove sound insulation and turn crankshaft clockwise by applying wrench to central bolt on crankshaft sprocket.
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Measure play between cam and valve lifter.
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Use wooden or plastic wedge to push down valve lifter. Replace valve lifter if an 0.20 mm feeler gauge can be inserted between camshaft and
valve lifter.
Note:
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After installing camshafts, engine must not be started for approximately 30 minutes. Hydraulic valve compensation elements have to settle
(otherwise valves will strike pistons).
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After working on valve gear, turn engine carefully at least 2 rotations to ensure that none of the valves make contact when starter is operated.