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Tom Wesenberg · 06-11-2015, 01:27 PM

Any time the shaft or fan is changed, it's best to trial fit the two together without the key, just to be sure the taper is a perfect match. Then use the key and make sure the fan hub still fully seats on the shaft taper.

If the fan hub is aluminum it's best to use a thin steel flat washer under the nut.

If the taper is a slight mismatch, I've heard of guys using valve grinding compound to lap them together.

06-11-2015, 01:27 PM	#2
Tom Wesenberg Senior Member Join Date: May 2010 Location: Mpls, MN Posts: 27,582	Re: Fan Keeps loosening on water pump Any time the shaft or fan is changed, it's best to trial fit the two together without the key, just to be sure the taper is a perfect match. Then use the key and make sure the fan hub still fully seats on the shaft taper. If the fan hub is aluminum it's best to use a thin steel flat washer under the nut. If the taper is a slight mismatch, I've heard of guys using valve grinding compound to lap them together.