fan pully problem - one solution...

[R.White]

I noticed that the fan was not running true and when I inspected it further I discovered that there seemed to be a part missing from one side of the pully. I was fortunate indeed that the fan blades had not come into contact with the radiator. In order to resolve the problem without trying to locate another pully (which would have set me back in time more than money), I decided to make a repair. I found a 1/4" spacer which fitted tightly on the spindle housing and after careful measuring I mounted the spacer on the pillar drill and machined two small holes opposite each other. In order to ensure accuracy, I applied a little adhesive to the carefully positioned spacer and pulley and allowed the assembled parts to set. I then went back to the pillar drill and passed the drill bit right through. Two small slot headed screws and nuts were then tightened securely with spring washers and the assembly then drifted onto the spindle housing. Although a good interference fit, I added a line of lead solder just for good measure. The fan pully is now operating as it should.

Quite why the faulty pulley should heve been fitted in the first place I shall probably never know. I am just glad that I noticed it before it was too late to save the fan and radiator from destruction!

[R.White]

[Machinist_Bill]

Nice photos Ray! Good Job!

[R.White]

Thanks Bill. One more job I can take off the list.

[Guest DodgeKCL]

You guys are into much earlier Dodges than I but I had to rescue my fan about 3 years ago also. I had just left the house when I heard the telltale clinking of the fan blades on the rad core. I stopped and took off the belt and drove right back home. Why had the fan rode forward into the rad? In the later flathead 6s, the water pump shaft, on which the fan is fixed, has a pin through it to hold the fan in place. I lost the pin. After removing the water pump to repair all this, I decided I didn't want it to happen again. So I made a sleeve with 4 'legs' welded to it and drilled a hole through each leg. I slid the sleeve over the end of water pump shaft where it extends beyond the fan face and then put in the 4 fan bolts to hold it to the flange. The sleeve covers the pin area and the pin can no longer fall out. I suspect this wasn't a big problem in the first 10 or 20 years but time is starting to give us strange faults that Chrysler never envisioned would happen.

[Ian_Greenlaw]

nice solution Ray. I'm sure others will benefit from you mod. great photos too

[R.White]

I must admit that the drift pin on this fan should be replaced. Following your example, KCL, I will ensure that the new pin cannot work loose. In the past I have found that a simple round nail can be cut down to make a good pin. With a tight interference fit it should stay put but to be sure I will peen over both ends. I feel sure there is no need for a hardened steel pin as it is only a retainer.

Ray.

[R.White]

I must admit that the drift pin on this fan should be replaced. Following your example, KCL, I will ensure that the new pin cannot work loose. In the past I have found that a simple round nail can be cut down to make a good pin. With a tight interference fit it should stay put but to be sure I will peen over both ends. I feel sure there is no need for a hardened steel pin as it is only a retainer.

Ray.