[W126 Coupe] timing chain question

[Josh Allen]

Attila wrote:

>

> Has anyone replaced the crankshaft gear, when

>

> doing a timing-chain ?? We plan on doing both

>

> camshaft gears, but not sure about the crankshaft.

>

> Is it a good idea as a preventive measure ?? This

>

> is an ’89, 420SEL, with around 180k miles. Thanks.

>

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I know I left the sprockets in place on my 500SEC when I replaced the 
guides and chain, but I saw no signs of wear on the cam ones, and they'd 
be the first to show wear due to the smaller size.

I'm not sure just how necessary it is thought to be, though.

-Josh Allen