Reply To: More motor triple questions.

[trusty220]

The belt tension is taken up evenly on both belts by adjusting the variator pulley. This is a double pulley with a sliding centre sheave, the same as you’d have on an old combine from the Fifties- adjusting one belt tension will upset the tension of the other belt which goes from the variator to the gearbox. When I was working on them we found the only really practical way to sort out the problem was to replace both belts, then set them up by putting the variator lever into the mid-way position and seeing which belt sat lowest in the sheaves. The engine was then moved back and forth on the chassis so that the belts sat level with each other in both sides of the variator, then the tension could be adjusted in use by moving the variator pulley in it’s slots to take up any stretch.

Sounds complicated but really very simple. Mind you, learning a few new swear words normally helped the process!