Hi can any one give me the part number for a new w116 6.9 air conditioning compressor belt please??
There are two possible belts. It depends on what your engine number is. Up to engine number 000869 the part number is 006-997-43-92. (12.5x1025)
From engine number 000870 part number 005-997-68-92 is used (12.5x1000)
Only the early belt shows to still be available from Mercedes for around 10 Euros. If you need the later belt just use the size I provided and search for a belt in that size from a reputable company like Contitech or Optibelt.
This may or may not help, but on my 6.9 I have a Goodyear "Gatorback" brand belt, 13AV1005. Take note though that I have a US spec with the Auxiliary Transmission Pump, so this will affect things as well with regards to the total length. You tension the belt by the bracket on the back of the pump.