SIX fan problems, metal on metal Options

[Trekkor]

So, I put the new alternator in and install the fan back in it's housing. Fan spins free with no issues.

Then I put it in the shroud and tighten up the strap around the alt stand.

When I run the motor it makes a horrid scraping sound and metal shavings are a flying. (IMG:style_emoticons/default/headbang.gif)

Why? Help me.

KT

[John]

Is that picture how it looks as you are "bench" running it?

If so, can you remove the fan belt and just verify that it is indeed the fan causing the noise.

If it is the fan, and you have the belt off, does the sound happen when there is no belt (spinning the fan by hand)?

Since it is out of the car and very visible, I would (with the belt off) get a flashlight and turn the fan by hand and watch where the fan is contacting the housing.

Is the alternator IDENTICAL to the old alternator or is it an updated alternator.

Is there any radial play in the alternator bearings? Can you press the fan and make it contact the housing?

How tight did you tighten the strap? It does not need to be so tight that it deforms the fan housing.

If it is the same fan and housing and the alternator is installed into the housing so that the fan does not rub, and the alternator bearings are good, the fan should not rub unless:

1. The housing strap is so tight that it deforms the housing.

2. The belt tension is so great that the fan contacts the housing at the bottom. (The fan belt should be snug, not so tight that you can't deflect it by at least 1/2" between the pulleys).

I hope you get this worked out in the very near future.......... (I can almost hear it)