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Audi C5 A6 Quattro 4.2 V8 Timing Belt Tensioner Versions
While buying a timing belt replacement kit from Blauparts, we learned that they are commendably adamant that we determine whether or not we have the earlier version of the 40-valve 4.2 V8 engine. I gather the "ART" version of the engine was made until part-way through the 2000 model year and then there was a change to the "AWN" version of the motor, for the last part of 2000 and all the way through the end of the C5 A6 4.2 V8 production run. And so, there is an important difference between A6 Quattro 4.2 V8 cars with a VIN up to a paticular value, vs. beyond.
Last Updated: 12/28/2018
Parts Group: Timing belt tensioner
Consistent with that, after reading up about it some more on various websites, including the official Audi parts illustrations, we learned that for the A6 Quattro 4.2 V8, the cut-off VIN is part-way through the 2000 production year. Apparently another way of knowing informally whether or not one has the early motor is the absence or presence of an "ESP" feature as evidenced by a button in the top center console. Early cars lacked this feature.
According to the FCP Euro website, the change happened between chassis number 85000 and 85001 though Blauparts seems to use a different cut-off: <130000 vs. >=130000.
Based on analyzing the contents of the early vs. late FCP Euro kits, the only difference I found involves the timing belt tensioner a.k.a. timing belt tensioner adjuster, informally called the "grenade pin" since it shares some visual similarity with a pull-the-pin-and-throw hand grenade. The early engine uses part 059109479B. The later engine uses part 077109479D.
According to what's in the FCP Euro kits, the same timing belt tensioner lever, which Audi calls the clamping arm, can be used for both early and late engines: 077109485E. However, according to the official Audi parts illustrations, for the timing belt tensioner lever, the early engine uses part 059109479B whereas the later engine uses part uses 077109485E. Even so, this isn't enough to assume an incompatibility, as in, that the later part should not be used on the earlier engine.
We don't sell these parts in used condition. We strongly recommend that they be purchased new and replaced as part of replacing the timing belt.