Question about 2 fan belts

I have a 1965 CJ5 with an F134 engine. The crankshaft pulley has 2 grooves and their are 2 separate fan belts. 1 belt goes around the generator and the rear groove of the crankshaft pulley and the belt tension is adjusted by swinging the generator in or out. The other belt goes around the water pump and the front groove of the crankshaft pulley with no way to adjust belt tension. Is this normal? All the pictures I have been able to find show just 1 belt that goes around the crankshaft pulley, the generator and the water pump. The belts line up as they are currently installed. If I went with a single belt, I would have to move the generator and it's pulley forward, or, somehow find a water pump pulley that moved the belt rearward. The current set up seems odd to me.

Thanks in advance for your help,

 

I am not sure but, but on mine I had a two grove water pump, the 1/2" groove ran the generator and water pump, the 5/8 groove ran the hydraulic pump for the plow.
I put GM alternators on both of my motors, on one I used the front groove with a 1/2" belt, on the other I put a 5/8" pulley on the alternator and used a the front groove.

 

FWIW, the military F-134 ran matched twin belts.

 

That makes sense Howard, I put a small belt on the back and it would hit the timing cover when it got a little lose.

 

Yes, although I always felt the civilian belt seemed "extra-thick."

 

Thank you for all the replies. I am guessing that the previous owner made some changes. As the Jeep is set up now, the single-groove generator pulley lines up with the rear groove in the crankshaft pulley and the single-groove water pump pulley lines up with the front groove in the crankshaft pulley. Perhaps I can find a new generator pulley that will align farther forward with the front groove of the crank and the water pump pulleys, or, find a new water pump with a pulley that aligns with the rear groove in the crank pulley and the existing generator pulley. A new generator pulley seems to make more sense.

 

By the way, the previous owner was my dad's age and a good friend of our family. He bought the Jeep new and used it in the spring and summer on his property up in the Sierra Nevada mountains near Donner and Truckee. I rode in the jeep as a 10 or 12 year old kid and got to drive it in my teens and twenties. The owner passed away in 1997 and the jeep sat in his barn for 17 years before his kids could bear to part with it. Once I heard it was for sale, I jumped at the opportunity. As you can imagine, it needed a lot of tender loving care to get it back into running condition - fuel tank, fuel lines, fuel pump, carb rebuild, charging system issues, all new brake shoes, hardware, lines, hoses, wheel cylinders and master cylinder and many, many other things. However, I enjoyed every minute working on this jeep that I consider an "old friend". One other thing, this jeep ran the Rubicon Trail back in 1993 or 1994. Those of you familiar with the Rubicon know that the trail was in much better condition back in that era. Without a lift kit and oversize tires and wheels, I don't think she could make it today!

 

Can you Post a picture of your setup bob that hour having questions about? I'm thinking either your generator has been spaced rearward with washers, or more likely you have the wrong pulley on your generator for your vehicle. I had a generator with a different pulley for my jeep so I purchased a different original correct willys pulley and just changed the pulley and it fixed my alignment issues.

 

It does not appear that the generator has been moved rearward, so I'm thinking a new generator pulley may be the answer.

 

Glenn, yes, that is the spin-on oil filter bracket that you see.

 

So Glenn - you think that I have an alternator pulley attached to the front of the generator?

Sorry about all the rust under the hood. While stored in the barb for 17 years the rats and mice lived under the hood. Rodent pee seems to very ver corrosive! My next project is to clean things up and get some new paint on the engine and engine bay.

 

Glenn, thanks for the pic of the generator and pulley. I can see it just fine. I'll have to drop by a automobile starter motor / generator rebuild shop and see if the can set me up with the correct pulley.

By the way, the other thing sticking out in my picture that you saw is a plastic or nylon cable tie. It's bundling together a vacuum line and an oil line or 2.