A8L Quattro Sedan W12-6.0L (BSB) (2005)
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Remove bolts - 4 - and chain tensioner - 5 - as well as the gasket located behind.
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Pull guide rail - 1 - from mounting pins.
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Remove mounting pins - 2 - and camshaft drive chain sprocket - 3 -.
Installing
‹› Replace gaskets.
‹› Engine locked at TDC position.
‹› Crankshaft locked in TDC position using Crankshaft Holder (3242).
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Set drive chain onto the crankshaft chain sprocket and onto the camshaft drive chain sprocket.
‹› The copper-colored chain links - 1 - and - 5 - must face toward the transmission side.