300D NA W124 6cyl donk

I had a quick look at my belt yesterday, my tensioner is running on an angle.

Are tensioners hard to fix on my ride?

Is there any where on the web or this forum with tips on how to and what to look 4?

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Peace and Blessings to you and yours
Steve

1987 /88 300D 178K & Very tidy
WVO RUG Diesel Blend OEM fuel heater thermostat by passed
1991 Nissan Patrol TD42 350k & very rough
WVO RUG Blend return line to cav 296 filter