<VV> Fan Bearing Shaft Diameter& Top Cover Bearing Bore Diameter

[Larry Forman]

Mike,
An arbor press will cause this sort of failure.   You should never use a 
press, but use a torch to gently heat the aluminum and allow it to just 
fall off (if removed and mounted upside down) or pull off gently.   Same 
for replacing it.   Using a press will gall the aluminum and create a 
non-press fit at temps.   I did that my first time and had an idler 
pulley simply fall off when driving. NOT good!   You can use spacers to 
"measure" the installed height and then use the same spacers as a stop 
as you heat the aluminum hub and allow it to gently settle down.   You 
might use a light tap to settle it into place when hot.

Larry Forman

On 4/22/2014 12:56 PM, Michael Emanuele wrote:
> While test driving a newly acquired 61 Monza that a lady friend just
> purchased I was going about seventy five mph on the highway when the fan
> bearing decided to try and launch itself. Luckily the accelerator cross
> shaft stopped it from going into space. I was able to find a rock on the
> side of the road and tap it back in to get home. My question is does
> anyone know what the bearing shaft diameter should be and what the bore
> diameter on the top cover should be. I have done bearing replacements
> before and have always had to use an arbor press for removal and
> installation. When I took the top cover off the car I tapped on the
> bearing and it fell out into my hand. The bearing was replaced by the
> previous owner and looks to be new. The shaft diameter measures .747.
> The bearing bore measures about .745. To me this is not good enough for
> a pressed fit. I am inclined to think that the top cover being
> alluminium is at fault. Any and all help is appreciated.
>     Mike Emanuele
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