TT Coupe L4-1.8L Turbo (ATC) (2001)
Lifter / Lash Adjuster: Testing and Inspection
Hydraulic valve lifters, checking
Notes:
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Replace malfunctioning lifters cannot be adjusted or repaired).
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Irregular valve noises when staffing the engine is normal.
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Start engine and run until the radiator fan has switched on once.
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Increase engine speed to about 2500 rpm for 2 minutes (perform road test if necessary).
Notes: If the irregular valve noises stop but reoccurs repeatedly during scoff journeys, a new oil retention valve must be fitted. The oil retention
valve is located in the oil filter bracket.
If the hydraulic lifters are still noisy' locate malfunctioning lifters as follows:
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Remove cylinder head cover.
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Rotate crankshaft clockwise by turning the central securing bolt on the crankshaft toothed belt sprocket until the cams of the lifter to be checked
are pointing upward.
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Determine play between cam and valve lifter.
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Press lifter down with a wooden or plastic wedge. If a 0.20 mm feeler gauge can be inserted between camshaft and lifter, replace lifter.
Notes:
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After new lifters the engine must not be staffed for approximately 30 minutes (otherwise valves will strike pistons).
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After working on the valve gear, turn the engine carefully at least 2 rotations to ensure that none of the valves make contact when the starter is
operated.