A8L V8-4.2L (BFM) (2004)
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Disconnect connector (arrow) from Camshaft Position (CMP) sensor 2 -G163-.
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Remove CMP sensor housing.
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Remove CMP sensor rotor and washer.
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Rotate crankshaft approximately 45 ° counter-clockwise by fuming securing bolt for toothed belt sprocket so that no pistons are at TDC.
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Re-check TDC position of camshafts.
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Marks on two camshafts must be in line with arrows on bearing caps.
When re-installing old drive chain
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Clean chain and camshaft sprockets opposite two arrows on bearing caps and mark installation position with colored marks.
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Distance between two arrows (and thus between colored markings) is 15 rollers on chain.
Note: Do not mark chain with a center punch or by making a notch or similar.