Just to confirm Brian's remarks,
The N type is stamped 134, and the PA 135. Both are wide ratio boxes. The
other N type we were looking after had a factory replacement box. This had
an R stamped before the number (sorry, can't remember what the number was!)
and was a close ratio box.
Andrew Fock
----- Original Message -----
From: <Kellmg@aol.com>
To: <panderson@northpark.edu>; <mg-mmm@autox.team.net>
Sent: Wednesday, October 23, 2002 3:01 AM
Subject: Re: PA/PB Gearboxes
> In a message dated 10/22/2002 11:21:19 AM Central Daylight Time,
> panderson@northpark.edu writes:
>
>
> > I recall reading something about how the PA and PB gearboxes can be
> > identified by their external markings on the case, but I can't seem to
find
> > where I saw it. My recollection is that the PA box may have been stamped
> > 135 and the PB box 165 (or was it 165 and 185?). I am curious because
the
> > original box in my PA was replaced by the works in November 1935, and I
am
> > hoping, naturally, that I have the better ratios of the PB (of course,
it
> > may have been replaced again at a later date).
> >
> > At any rate, mine is stamped 165. I'd appreciate any help. Thanks.
> >
> > Phil Anderson
> > PA1212
> >
> >
>
> Hi Phil,
>
> Not a definitive reply but for what it's worth,
>
> The crankcases for the P-Types were stamped 135 for the early single
breather
> and 165 for the later double breather.
>
> The gear boxes were stamped by their "model code number".
> Mine is an early PA hence the 135 stamp on the block and the gear box.
> From this I presume that a 165 stamping on the box doesn't necessarily
> indicate that it's a PB close coupled ratio, could it be a double breather
> PA. You could jack the car up and turn the engine by crank one revolution
and
> see how many turns on the propshaft in first gear. The ratios are given in
> Blower's.
> The 4/10 stamp at the opposite end of the P-type box indicates the speedo
> drive ratio.
>
> Brian Kelly.
>
> /// unsubscribe/change address requests to majordomo@autox.team.net or
try
> /// http://www.team.net/cgi-bin/majorcool
> /// http://www.team.net/mailman/listinfo
> /// Archives at http://www.team.net/archive/mg-mmm
> /// Send list postings to mg-mmm@autox.team.net
/// unsubscribe/change address requests to majordomo@autox.team.net or try
/// http://www.team.net/cgi-bin/majorcool
/// http://www.team.net/mailman/listinfo
/// Archives at http://www.team.net/archive/mg-mmm
/// Send list postings to mg-mmm@autox.team.net
|