New fan blade wobbles

Did the old fan do the same thing?

I am guessing you notice it while it is running.

Maybe the fan itself is defective?

Are you certain that it mates up with the flange correctly and is not cocked up (or maybe even the wrong hole size (wrong fan)?

The clutch screwed on fully and is not crossed up?

Next idea is improvised, as many people do not have precision measuring equipment. This will pick up on a major problem.

With the engine off,

Find a stiff wire of some sort, like a clothes hanger or a piece of copper house wiring.

Use a pair of vise-grip pliers and clamp one end of it to something that will not move (bracket, etc.) Near the fan.

Bend the other end as to almost touch a fan blade.

Rotate the fan with your hand slowly,

Is the gap between the next blade and the wire growing or even hitting the wire?

Now adjust the wire so it almost touches the "hitting" blade as you rotate the fan blade, now as the blades pass by you can sort of measure the wobble distance of the blades.

Keep in mind, the plastic fan is not super perfect anyway, so if things are close, the fan may be fine.

Or it might even be the fan clutch that is warped/defective.

You still must determine what is the problem.

Yep, you can kind of use the same test in the fins of the clutch.

This time the clutch has a tighter machined tolerance. So your improvised test wire should hover very close when the fan/clutch is rotated.

If all is good above, there is only one factor left.

The two items above rotate on the same axle/axis- the water pump shaft did not turn at all during this test. Neither did the clutch shaft (it was anchored to the water pump shaft) Only the end of the clutch and fan moved.

This time remove the belt, see if you have any wobble in the water pump shaft. There should be absolutely none! You will notice the wobble more as you try to "wobble" it nearer to the fan. The water pump shaft should turn steadfast only.

One more possibility, is the shaft for the clutch (remember it could not turn either anchored to the pump) so in the "non-moving" position the clutch face and the attached fan were traveling on that "stopped" axis.

An extreme stupid example of what I mean is, if the clutch shaft was bent at a 45 degree angle and could not move, everything on the end of it could still spin true and be perfect! However, when the mega-bent shaft turned too, everything attached would wobble with it!

Better?

If all was okat with them and there is no water pump wobble, The clutch shaft can turn with the belt off. If that short clutch shaft is bent or molded wrong, that may be your wobble.

If you go back to the fan or clutch head/face with the wire test, if you rotate the water pump (determined to have no wobble), clutch, and fan as one unit. If the clutch shaft is the problem you will see the the wobble at the fan/ clutch that did not show up at first.

Keep us posted.

The Medic

The impeller is on the inside of the pump, there is no mechanical connection between it and the engine. It spins with the shaft and moves water.

Did any of the tests show any abnormalities?

The Medic

So, next time you see me, you are buying lunch!

Glad you got it all figured out, I hope maybe that some of my input helped.

Do not forget about "Repair Guides" at the top right of our pages. They may be useful in the future. Here is a link to them:

https://www.2carpros.com/articles

Send your buddies to see us, maybe yours is good for a long while!

The Medic

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Cheers, Ken