Wobbling water pump can do it, when the pump starts to wobble at all it is eating metal inside. Will eventually leak out the nose. When replacing a water pump a new clutch should be fitted, as the former pair were locked in an embrance for a long time and neither likes a new partner. Plus fan mount problems, cracked fans, etc. A siezed viscous clutch can make a fan run at higher speed, would expect more deflection. One member was working on his, a piece of the fan had cracked off, it flew up and punched hole in radiator. In his driveway.

 

Well the hip bone is connected to the shoulder bone. The last time this happened the fan took out the plastic cover that goes over the belt drive.

Too bad I'm out of warranty now on the water pump.

So are you saying I'll likely need a new water pump, fan clutch, and blade?

 

wobble gotta come from somewhere

 

Then I guess I know what I'll be doing this week. Plus, I get a new $50 wrench.

 

I just use a hammer and a crescent wrench.

 

yep, hammer and crescent.
knock it with a 5 lb shortie hammer to the left.

Inspect your fan blade for cracks. In the big ring too.

You may need to put the fan onto the fan clutch a few times using different
hole combinations to balance it out.
Plus the bolts all need to match in weight.

But, what will really affect balance will be the furthest out spinning parts - the edges of the fan.

You may have got a rock in there and messed up the fan. Or the fan is just damaged from excess heat and cracking.

If your fan clutch has failed toward always "gripping" then your fan will roar and you may be spinning the fan beyond its specifications.

This may contribute to old crusty fans flying apart

 

Thanks guys.

What do you mean by "gripping"?

I will assuming that the extra heat I've been experiencing lately is the cause.

 

I overheated and replaced the water pump.
About a month later I saw it in the red. Added water
A few days later I started it and it sounded like gun shots. POP POP
I pulled the dip stick and saw a milk shake.
It took some time to see the real cause, the head gasket

 

by "gripping" he means engaged at full coupling, in this case 100% power transfer. Normally you cruise along at about 20% coupling, and when fan clutch heats up coupling increases to 70-85% depending on type of clutch. 100% is just like the old rigid fans. For an emergency repair people have been known to drill a couple of screws through a bad clutch.