Only if the guides have slots worn in them. You cannot reliably seal the front cover unless you remove the head. I've not seen significant wear on mine, at 245,000 miles. The "new" 300D has over 300,000 but I've not checked the guides yet.

Peter

On Feb 23, 2009, at 2:26 PM, Wilton Strickland wrote:

When replacing timing chain in my '91 350SDL (102 kmi on chain, tensioner,
guides, etc.), should I replace tensioner, guides, etc, too?

Wilton


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