Comment on Mechanics. When I was in Tradeschool one of the Instructors told us that when you have the Vehicle in you Shop look for other work that you can do.

The tone of the Instruction was leaning towards that you sould make the Customer doubt the condition of they Vehicle. Like if you saw a tiny crack on the Fan Belt you would tell the Customer something like it is possible for that Belt to fail hoping the Customer would opt for a new Belt.

In the past a lot of US Cars that had Timing Chaings had Timing Chain Gear Teet on the large Gear that were made out of Nylon or Plastic. They were good for about 150-200K so Mechanics got used to telling People to repalce the chain at the earlist Mileage.

Along with the above some Timing Chain setups have no tensioner.

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84 300D, 82 Volvo 244Gl Diesel