GM 6.5L V8 – Drive Belt and Tensioner

The crankshaft pulley assembly uses a drive belt that is flat on one side and has poly-V construction on the other side (refer to Figure 5-4). The path of the belt allows it to drive the water pump with its flat side and drive the power steering pump, generator and A/C compressor with its poly-V side. The vacuum pump is driven with either the flat side (with A/C) or poly-V side (without A/C).

The drive belt has a tensioner located on the accessory support mounted to the left cylinder head. The tensioner uses a spring to constantly apply force to the flat side of the drive belt, using a rotating idler pulley. For service purposes, the tensioner has a built-in gauge to indicate the amount of drive belt stretch and related tension.


Leave a Reply

Your email address will not be published. Required fields are marked *