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Originally Posted by Rsnail
... does the ancillary belt have it's own idler and tensioner?
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Yes.
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... the ticking is coming 100% from the rear belt, the one closest to the firewall (right under the right side of the inlet manifold when looking at the engine).
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It's relatively easy to remove the belt covers and check the tension and condition of both rear belts.
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... the assembly is made out of 2 pulleys that are timing the admission and exhaust camshafts, correct me if I'm wrong.
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You're correct. On each bank a rear belt drives the exhaust camshaft from the corresponding inlet camshaft.
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... which one of the pulleys would be more prone to premature breaking?
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Neither. There is no tensioner either and my rear belts lasted 90,000 miles (and 20 years) easily.
Simon