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One side is buttoned up, moving onto the other today. I elected to leave out the collars. My first rule is that the factory knew what they were doing. Ok, so the factory knew that the 'reservoir' hydraulic tensioners wouldn't last the lifetime of the engine (so they swapped to pressure fed when they decided not to end of life the 911). Actual stories of tensioner collapse are rare so I'm OK with keeping an ear to the engine (which I'm obsessed with anyway).
No doubt I'll be back under those chain covers at some point and I'll re-assess then.
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