I am going to have my engine/transmission out of the car in a bout a months time. While the engine is out, is that a good time to do things like clean the outside and check/replace timing chain and other stuff?

I'm going to be doing some rust repair soon, if everything goes according to plan....

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RIP: 80 300SD
RIP: 79 450SEL
2002 E430 4matic (212,000km)
2002 ML500 'sport'

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