Inspection of the Belt Tensioner

Belt tension is automatically adjusted with a spring tensioner. See Fig. and Fig. . Check that the tensioner is holding tension on the belt by inserting the end of a breaker bar in the 1/2-inch square hole on the forward face of the tensioner, and rotating the tensioner away from the belt. When the breaker bar is slowly released, the tensioner should return to its original position. The tensioner should rotate smoothly with no binding. If not, see Principles of Operation, EPA10 Engine in the 108SD Plus and 114SD Plus Workshop Manual for replacement instructions.

Front Belt

Rear Belt

AC Compressor

Spring Tensioner

Fan Clutch

Water Pump

Fig. 1, DD 13/15/16 Drive Belt Routing

Spring Tensioner

Alternator Pulley

AC Compressor

Fan Clutch

Drive Belt

Crank Shaft Pulley

Fig. 2, Cummins ISC/ISL Drive Belt Routing