I hear lots of different theories on what mileage to change the timing chain. The best guage is to check the stretch and let that tell you what to do. I have heard that you change this timing chain by rolling through. You attach the new chain to the old one and turn the engine over while another person holds the new chain and guides it. Is the true or do I have a wild imagination? It sounds easy enough.

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1982 300D Turbo "Helga"
380,000 miles