Is there a bolt in the middle of the tensioner pulley? Most of the automatic tensioners allow the pulley to be rotated inwards by putting a socket on the pulley and turning which rotates the pulley inwards and releases the belt tension.

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Ali Al-Chalabi

2001 CLK55
1999 Dodge Ram 2500 Cummins Diesel
2002 Harley-Davidson Fatboy
Merlin Extralight w/ Campy Record