Indigo Electronics Atomic 4 Belt Tensioning Device

Original Design

As originally built, the Atomic 4 engine was not equipped with any means of adjusting belt tension. Brute force or some sort of "jury rig" was used instead. As a result, it was very difficult to obtain the proper belt tension. This problem becomes more of an issue when the Indigo Fresh Water Cooling pump is added or a high output alternator is installed.

Indigo Design

What is it? - The guiding principle behind the new Indigo design is a simple, convenient, and effective means of adjusting belt tension. A very simple jacking mechanism has been developed to allow for proper belt tensioning in even confined locations. Shown below are views of the device as installed.

How Does it Work? - The existing bolt that locks the alternator in position relative to the adjusting arm is removed. A new small and a new large sub-assembly are attached to the adjusting arm with a new alternator locking bolt and the bolt attached to the small sub-assembly. By rotating a long "coupling" nut on a stud, the alternator is easily lifted to properly tension the belt. Once the belt is properly tensioned, the new nuts are fully tightened to lock the alternator in place.

NOTE: The long coupling nut is utilized to allow easy rotation with a wrench even if you cannot readily see the nut and must feel your way along.

Easy 30 minute, "bolt on" installation, all necessary components included. Easily adjust belt tension in even the tightest engine compartments. All fasteners Stainless Steel.