I'm in the middle of doing the R&R for the serpentine belt tensioner on my 1987 300D. I have a few questions:

1. Do I need to use some sort of sealant on the main tensioner arm bolt that attaches it to the engine? If so, would high temp RTV silicone gasket maker (the red stuff) work?
2. What is the torque on that bolt?
3. Someone mentioned a washer that is supposed to be between the arm and the engine. My old tensioner did not have one. Is there definitely a separate washer I need to buy, or is it possible that the new arms don't need it?

Thanks for any help...

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1987 Mercedes 300D ~200K (Greasecar & Biodiesel)
1993 Ford F-250 7.3 IDI diesel 165K (Biodiesel)
1996 Thomas/International Bus with DT466 engine