Re: [T3] Fan Rubbing

["Jim Adney" <jadney@vwtype3.org>]

On 14 Mar 00, at 19:40, Stan Schaefer wrote:

> Anyway, I've just finished pulling the
> fan and housing apart and found that the main fan(centrifugal part)
> had been rubbing on the front part of the housing.  Now the fan bolt
> did seem to come out easily, but the only other times I've done it,
> the engine was out of the car and I was using a breaker bar, this time
> I used an impact wrench with it in the car.

I don't have much to offer on this.The way the hub fits on the end of 
the crank, there really isn't any way that the fan can just tilt or slip 
forward. I would check 2 things: Make sure that thefan is secure 
where the sheet metal part attaches to the hub since they 
sometimes come loose or crack there, and make sure that it was 
not the "snail" that came loose and moved back so it could hit the 
fan. If you had those bolts come loose before, then the threads 
might not be in the best shape.

When I build an engine I tap the 2 snail bolt holes deeper into the 
case and use longer bolts AND Locktite. They are just too much of 
a pain to have to deal with later. Since Stan said he's already had 
to do this, he already understands.

Do you have the "handle" attached to the rear of the fan? It is 
probably important to have it there because its securing bolt is the 
major support for the housing. It is also important to think carefully 
about your sequence of tightening things down so that the breather 
stand can support the fan housing square against the tail of the 
case. If you tighten down that stand randomly before you get to the 
snail then you have a good chance of putting a curse on the fan 
assembly.

Does everyone know what I mean by "curse" in this context? If you 
put a mechanical assembly together in such a way that there are 
forces set up in the parts simply due to improper fit or position then 
that is a curse. Careful and thoughtful assembly can usually avoid 
this, the hard part is knowing when you need to be careful. You 
just have to think about all the ramifications of what you are doing 
as you do them, and you often have to back up and loosen 
carelessly tightened bolts so that some part can shift position and 
go together stress free.


-
Jim Adney
jadney@vwtype3.org
Madison, WI 53711-3054

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