BeltTension Adjustment

TheNitro 4 Tec has three drive belts that can stretch or become damaged over timedue to normal wear. If left unadjusted the belts may start to skip over thedrive pulleys, which can hinder performance and damage the belt's toothprofile. The rear belt tension is adjustable via belt tension cams in the rightand left rear side plates. The rear belt in the Nitro 4-Tec transmits most ofthe engine's power. Because of the high loading on the rear belt, the tensionshould be checked every 3-4 hours (20-25 tanks of fuel) of running.

If therear belt can be deflected more than 0.25" (6mm), the belt tension cams shouldbe rotated rearward to the next eccentric slot.

TheNitro 4-Tec's front and middle drive belts are designed to have a high initialtension. During the break-in period, the drive belts and pulleys will "wear in"and the belt tension will gradually decrease. Inserting shims under the frontbearing block can tighten the front and middle belt tensions.

Do nottighten the front belt tension unless there is more than 0.25" (6mm) deflectionat the center of the belt. To tighten the belt, add the 0.1mm shim and retest.If the belt is still loose, remove the 0.1mm shim and add the 0.2mm shim andretest.