[alfa] Re: remove the filler plug before the drain plug

[alfa@xxxxxxxxx]

> Date: Thu, 1 Jul 2004 08:30:04 -0700
> From: "Jay Mackro" <jmackro@domain.elided>
> Subject: [alfa] remove the filler plug before the drain plug
>
> "Dean W. Cains" <dwc@domain.elided> had written:
>
> > And, always  remove the filler plug before the drain plug,
> > for reasons I'd rather not  remember, although a gearbox
> > was involved.
>
> Hmm - I can't figure out why that would be important.  At first
> I thought "sure, you need to let air into the differential in order
> for the fluid to drain quickly and completely".  But then I
> remembered that the diff has a little piece of hooked tubing
> welded to one of the axle tubes that admits outside air (I
> guess so that pressure can't build up inside the diff, and
> push oil out through the seals).
>
> So, why take out the filler plug first?  Is this like when you
> disconnect a battery, you remove the ground wire first?
> That one I understand.  Both differential plugs need to
> come out anyways when you are changing fluid, so I guess
> it doesn't hurt to start with the upper one.  But, why?
>
> Sorry to put you on the spot Dean - Jay Mackro

For me, it's so that I know I can refill it after I drain it....  Kind of a
bummer to drain out a vital fluid, only to be not able to refil it.  Especially
with the diff, as there are no other methods of filling, unlike the trans where
one can fill it via the shift tower.

Eric Storhok
AA, MI
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