Hello,



I just installed a new alternator into my brother's 94 RX7 & had a question about the belt adjustment procedure. First of all, I had all types of trouble getting the belt off initially, even after the adjustment nut was fully loosened, as well as the alternator and compressor hinge points. After swapping out the alternator, I had even more trouble getting the belt back on. I'm not sure if it was a old belt, or if it was just cold and shrunken, or if I missed something on the install, but this thing was impossible. After wedging the belt back on, i left everything loose and tightened the belt using the adjustment nut. It seemed strange that the compressor just sat there when it has and hinge and adjustment nut. I was wondering if I missed something when adjusting this belt. Any info will be of great help. Thanks

 

As suggested by that hinge bolt on the airpump there are TWO adjustments on that belt. The tensioner at the alternator, and an adjustment under the airpump...which I assume you refer to as the "compressor". The latter is a little hard to see. Takes a 12mm IIRC.

At any rate this is how I've done it....

The airpump adjustment should be backed off completely. Back-off the alternator tensioner 1/2 to 2/3 of the way from the top...or until you can slip the belt on by hand. Shouldn't need prying. After installing the belt, pull the airpump tight against it with your hands and secure that adjustment. Then 'fine-tune' the tension with the adjustment at the alternator. There is a specification for deflection in the FSM (Factory Service Manual)to give you the right tension using a special tool. I usually just push against the longest length of belt and estimate proper tension.....erroring on the side of TOO LOOSE initially. If I get squeaks on start-up or quick acceleration then I'll tighten it a little more. Repeat as necessary.