Re: SER1 Overdrive whine - your dept., George ?

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Hi Anthony,

I was just about to head home so I may have more ideas tomorrow, but the
overdrive output gear replaces the transfer case drive gear and there is
no reason to believe that the wear patterns on either of these bears any
resemblance to a new gear or, more importantly, to each other.  As they
'wear in' I would expect that noise to moderate.  Unfortunately, you
should hear it in either overdrive ratio, so you seem to be hearing
something else.  Is it possible your Fairey was assembled from bits of two
or more boxes?

Shimming a helical gear to shift the wear patterns might change the
amplitude of noise but not the frequency.  Shimming a helical gear to
reduce the lash will often reduce 'whine';  in this case it could be the
overdrive laygear (cluster) since that is only loaded in overdrive.

Under the best of circumstances, though, you've added more lash to the
system -- expect some whine on decell.

Hope that helps.

George E Sollish	Chief Engineer		Auto Gear Equipment
			Project Manager		The Payne Lake Project

On Sun, 10 Oct 2004 Forwyn@xxx.xxx wrote:

> Date: Sun, 10 Oct 2004 18:51:55 EDT
> From: Forwyn@xxx.xxx
> Reply-To: series1@xxxxxxxxx.xxx
> To: series1@xxxxxxxxx.xxx
> Subject: SER1 Overdrive whine - your dept., George ?
>
> Hi Gang & particularly George,
>
> Some members may recall that, having fitted a s/hand Fairey overdrive some
> months ago, it was very noisy when engaged.  Well, I was offered another by
> the garage but before we got round to fitting it, curiously the noise level
> dropped after a few hundred miles and so whilst it is still a bit whiney it's
> liveable with and seems to be improving all the time.
>
> Someone else told me that it may not be the overdrive itself at all, but
> rather a slight mis-mesh where it mates with the main gearbox / transfer box.
> They had cured the same problem by fitting a couple of shims somewhere so that
> the cogs lined up better.
>
> Any thoughts, anyone ?
>
> Regards to all,
>
> Anthony
>
> 1955 86"
>

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