The online manuals are fine, but the best source for your repairs is this forum!

I think for lots of items others that have been down the same road is the best info source. I think the Haynes and other general manuals are good only for basics, which you probably already know.

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1981 300D 147k
1998 VW Jetta Tdi 320k
2001 Dodge Ram 2500 141k
1979 300D 234k (sold)
1984 300D "Astor" 262k(sold)
Mercedes How-To and Repair Pictorials
I love the smell of diesel smoke in my hair