Re: SER1 Overdrive whine

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Hi Anthony,

There's no load on the overdrive internals when operating in 'direct' so
the noise is coming from inside the Fairey.  The interesting thing is that
accel, decel and towing are all higher load conditions than driving free,
and the amplitude of mesh-related noises varies directly with the load, so
I would rule out that source as well. This would seem to point at odd
things -- perhaps under load the chassis is twisting relative to the
overdrive shift lever mounting (noise from the shift fork/sliding clutch
rubbing is transmitted through the linkage to the sheet metal, with these
being bound more tightly under load the noise increases. If this were so
the noise would moderate as the loaded side of the shift fork wears away).
The reason the stock mounting is from a bracket bolted to the transfer
case is to prevent this sort of thing. If your mounting is stock, check to
be sure that there is no incidental contact with the sheet metal possible.

See, I told you I could think of something better :-)

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

On Mon, 11 Oct 2004 Forwyn@xxx.xxx wrote:

> Date: Mon, 11 Oct 2004 17:27:23 EDT
> From: Forwyn@xxx.xxx
> Reply-To: series1@xxxxxxxxx.xxx
> To: series1@xxxxxxxxx.xxx
> Subject: Re: SER1 Overdrive whine
>
> Hi George & Peter,

>  Many thanks for the replies and particularly interested to hear the
> views from a professional, George !  Yes, it's a bit of a puzzler in
> that there's no whine when the unit's disengaged. Also, the whine is, or
> at least was, at its worst when in what you might call 'cruise mode';
> i.e. when neither accelerating nor decelerating, when the noise
> virtually disappears.

>  Yesterday I did 90 miles towing and I'll swear the noise has reduced
> even more !  I find the 2 litre will 'pull' the overdrive quite happily
> on the level with a ton or so behind, but even the slightest incline
> means disengaging it.
>
> Best wishes,
>
> Anthony
>

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