DO NOT drop the chain unless you plan on taking off the timing chain cover Use a coat hanger or bungee cord as engatwork suggested.

That's a whole job in and of itself. Some say "might not be a bad idea to reseal it while you're that far" but I say if it aint broke (leaking) don't fix it.

Good luck J.H.

~Paul

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'91 300E, 215K miles