Does the Audi A8L W12 have a timing belt or chain?

Asked by Jabea49 Nov 14, 2015 at 10:21 PM about the 2005 Audi A8 L W12 quattro AWD

Question type: Maintenance & Repair

Looking at buying a used Audit A8L W12 and wanted to know if 12 cylinder
has a timing belt or chain?  What is the recommended service interval for this
area?

5 Answers

Chain- http://www.audiworld.com/model/a8/05/05A8LW12.pdf

8 people found this helpful.

The service/maintenance schedule is $12 to download, so I can't say. But usually timing chains are good for life of engine ... 420 HP, wow

5 people found this helpful.

Does a W12 have 1 or 2 timing chains? A W12 is two v6 engines connected into a "W" configuration.

5 people found this helpful.

From what I could find, it has 3. It has four camshafts, one chain from crank to a sprocket with a double roller-chain with a chain going to each side

6 people found this helpful.
Best Answer Mark helpful

For a brief overview, all W12 Audi/VW Engines are Chain driven. Timing aswell. Its basically 2 VR6 Engines, which is a offset Inline 6. Like what FordNut said above, a normal VR6 is a dual-overhead cam design, thus a W12 would have 4 total camshafts, 2 for each bank, both with a tensioner to tighten or loosen timing for intake/exhaust and a main chain for linking the crank to both sprockets that join both the chains for the camshafts. The engine is actually smaller in physical size than a 4.2 BFM V8 in the A8 (both the belt motor and chain motors) Though when you need to do timing and chain pads its a engine out job, engines with a timing chain (Anything after 2005/2006) on all Audi longitude engines, are at the firewall.

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