I have a '99 Suburban with the 454 (7.4L) engine and the belt needs replacement. Looking at the service manual, I am confused. The manual shows a tensioner on a pulley arm. My vehicle has a tensioner mounted on the rim of a disk (?) that in turn is bolted to the engine. It looks like to get the belt off I should rotate the disk clockwise. But it looks like a special tool may be needed to do that. There is no square hole for a socket wrench.
The tensioner on the vehicle has the correct part number 10237275 for this part on a 7.4L engine, but I have not found a photo or diagram of it online.
What is this strange kind of tensioner called? Do you recognize it from my description? Can you find a picture of it? Do you know how to work it?
TIA,
Una