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Re: [T3] Odd Type3 Noise- online audio diagnosis sought !

On 10 Nov 2003 at 1:09, Mark Seaton wrote:

> I didn't know that you weren't supposed to use that paper gasket, but it was
> very thin. The end-float that I measured was below the specs in Haynes so I
> figured it wouldn't do any harm. Should I take it out and do you really
> think that such a small addition to the end float could cause this nasty
> sound? Will it cause me further troubles down the line if this isn't the
> problem now? Another thought I had was that maybe I didn't centre the fan
> housing well enough and that was causing the fan to rub when the engine
> warmed up and maybe the crank elongated a bit?

I think the paper gasket is much thicker than the end play spec, so adding it 
probably put you probably twice as high as you should have been, in end play. 
I'm not sure what the down side of too much end play might be. I expect 
excessive wear might be one of them. Think of what the rod bearings must go 
thru to stay in line with the pistons if the crank can move back and forth too 

Some of the sounds sound like the screws that hold the fan housing to the case, 
so you may be pulling the fan housing off to check those. If you do this you 
can measure the end play from that end, which works just as well.

I don't think centering the fan housing is that big a deal, but if you're way 
off the oil return thread on the fan hub will grind off alum from the fan 
housing and pull it into the case. I think this is unlikely. It's not likely to 
cause the fan to rub, and the case will expand more than the crank in any case.

Jim Adney, jadney@vwtype3.org
Madison, Wisconsin, USA

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