[Keith True]

All old fans need to be looked at and are subject to failure. They are old.Working on equipment and trucks I have seen lots of fan failures over the last 35 years.I have had good luck with the old four blade types,as long as they were not rusty,or bent from people turning them over by hand,then bent back again.The only fan failure I had on an A was an aluminum one that grenaded.That one I had put on and never looked at again,thinking it was a new cast part and was bulletproof.I had just gotten up to speed,about 60 mph or so and it sounded like the engine was trying to jump out of it's mounts.It had big voids in the casting at the break.Just like the old four blades,one bad one doesn't mean that all others are bad.I'm not afraid of an aluminum fan because of it,I just know to watch it like the others.When you get the new one just make sure the blades are parallel,I saw one that had one blade a half inch ahead of the other.Also,blacken the taper on the waterpump shaft with a magic marker and spin the fan on it.That will tell you if there is good contact between the two.I changed one a couple years ago on an A,the owner said the fan was not seating right because of a bad taper.Turns out the problem was he had let the key ride up when he put it on,the taper was fine.He had read horror stories of how the tapers were off on some and it couldn't possibly be his careless installation.Also,use a hard washer between the nut and the hub.Without it the nut will start a cut into the soft aluminum hub.If you take one apart that has been run without a washer you can see the hex of the nut formed into the hub.