Quote:
Originally Posted by Ken300D
I don't know why, but the timing chain tensioner on your 240D is different from those on 300D cars. On the 300D, there is a ratchet type mechanism that prevents the tensioner from going backwards to release pressure against the chain. There's nothing of the sort on a 240D tensioner, just a spring.
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My understanding of this was that they used the same type tensioner on both the 300 and 240, but the ratchet type was a newer design of the old spring only unit put into the newer (later) engines and used as an improved retrofit replacement when the older type ones fail.