----- Original Message -----
From: scott beavis <scottbeavis@mobrey.com>
To: <paul.hunt1@virgin.net>; MGs (E-mail) <mgs@autox.team.net>
Sent: Wednesday, November 01, 2000 9:32 AM
Subject: RE: Dodgy alternator?
> >There is a vent tube near the RHS that exits underneath at the front of
the
> >tunnel. It is a length of hose with a bulb shape at the end - unless a
PO
> >has cut it off. Why would they cut it off? 'Cos they can get blocked
with
> >25 years worth of gunge, fill up, and overflow into the car. It can be
> >poked through with a length of dowel from above.
>
> Is there any dissadvantage to cutting the bulb off? I'll take a look. My
> main concern is that the heater air box thing will rot out, or that water
> will get in and rot the floor.
I think it is there to stop fumes being drawn back through the tube and into
the cabin, the same bulb is on my daughters Metro of 1990's vintage. Many
people do cut them off, my daily driver/lives outside has not been blocked
in the 5 years/50k miles I have had it.
> >No, it's off the main green fuse on most years, but on a separately
in-line
> >fused green (just to confuse) branch on late years.
>
> It's a 1978 MGBGT. What do you mean by 'green'? Is this the current rating
> colour code? I think there are four fuses in the fuse box. Wouldn't
supprise
> me if they are the same as on other BL cars ie: Fuse 1 = IGN pos II, 2 =
key
> out, 3 = IGN pos I, 4 = sidelights.
'Green' as in the colour of the wires. The bottom fuse is always hot, brown
(unfused) one side and purple (fused) the other. 2nd fuse up is ignition,
white (white/brown on later cars, unfused) on one side and green (fused) on
the other. The top two two fuses are for the side/parkling lights, one each
side.
> >Hot idle is the real test, what's that?
>
> Not a lot. About 15-20psi. Often the OPRV is venting too soon, and a nut
> under the cap will boost Oil P by 20 or so psi. Maybe the engine is too
> worn.
That's not too bad, Workshop Manual says 10 - 25 idle, 50 - 80 running. It
also says the relief valve should open at 70.
> >Halfords stock both their own brand and Champion and they are list the
> >number for the MGB under 'Rover'. C102, I think, for Champion.
>
> I looked in their look-up charts for lots of bits like oil filter, plugs,
> leads, etc. All just had " --- " written for the part number, meaning they
> don't stock it. Maybe at larger stores they do. I know that the plugs are
> the same as on my mini (BPY6E?) so that isn't a problem, but the oil
filter
> is larger on the MG's B series than on the mini's A series. I will look at
> the C102 filter. I just wondered if a modern Rover used the same filter
(eg:
> Rover 400).
MGB plugs are all based on the original N9Y i.e. RN9Y, RN9YCC etc.
PaulH.
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