Chris,
I know this response may be a little late for your purposes, but I changed
my oil in the gearbox over the weekend in order to replace a
faulty seal on the speedometer pinion. I chose 20W/50 (strictly because
the manuals say to). Even though my B is a 1978, it has the non-overdrive
transmission off a (I believe) 1973 MGB. To fill the gearbox quickly and
easily, I fashioned a four foot piece of 5/8" outside diameter clear
plastic
tubing (1/2" inside diameter) with a small funnel at one end. I fit the
other end into the gearbox filler hole and stuck it in two or three inches
to ensure it would stay in place. I held the funnel with one hand and
poured about 2.5 quarts of oil into the funnel. This brought the oil level
onto the very bottom of the dipstick. I then used my hand-pump oil can
filled with 20W/50 to bring the oil level up to the full mark on the
dipstick. I didn't note the exact amount of oil used to go from Low to
Full, but it seems like it had to be less than a pint. The whole process
took about ten minutes.
Hope this is of some help.
Regards,
Scott McKorkle
Issaquah, WA
1978 MGB
----------
> From: Christopher Delling <saschris@flash.net>
> To: 'Lawrie Alexander' <Lawrie@britcars.com>
> Cc: 'mgs@autox.team.net'
> Subject: RE: Transmission Questions
> Date: Thursday, March 19, 1998 7:43 AM
>
> Thanks for chastising me on this one. Getting a little cranky are we? I
know that the owners manual specifies motor oil, I didn't choose to have it
filled with 90 weight. What I wanted to know was if the use of the gear
oil is causing my problem. I intend to drain the gearbox and overdrive,
and refill with motor oil. I have one vote for 20W50, and one for 30
weight. What do you recommend? Do I need to flush out the box (if so,
what should I use?), or is simply draining and refilling going to be O.K.
>
> I also know what a dipstick is for, and in general how they work.
Specifically how low is the tranny when the oil drops to the low mark? A
pint? A quart? No marks that I have seen give me a clue, and seeing that
it's already a pain in the ass to get oil into the transmission (as opposed
to in the interior of the car, I would prefer to have some idea of how much
oil to put in so that I don't have to keep pulling the hose out to check
the level during the filling operation.
>
> Regards,
>
> Chris Delling
>
> -----Original Message-----
> From: Lawrie Alexander [SMTP:Lawrie@britcars.com]
> Sent: Thursday, March 19, 1998 12:55 AM
> To: Christopher Delling; 'mgs@autox.team.net'
> Subject: Re: Transmission Questions
>
> Chris....if the factory had felt it was OK to run the gearbox low on oil,
> they'd probably have fitted a longer dipstick. Also, if they hadn't
wanted
> you to use engine oil, they'd have said so.
> I think you just proved why it's so important to read the owner's manual
> and do what it tells you!
>
> Lawrie
>
> ----------
> > From: Christopher Delling <saschris@flash.net>
> > To: 'mgs@autox.team.net'
> > Subject: Transmission Questions
> > Date: Wednesday, March 18, 1998 5:32 PM
> >
> > My B is fitted with a 4-synchro O.D. tranny, which was rebuilt last
year.
> It seems that the gears in the tranny have a ceramic like coating on the
> taper that the synchro ring rides on. The bond between the coating and
the
> 2nd gear failed, and the coating fell of, rendering the synchro useless.
> This occured very suddenly, one gearchange was fine, the next was
> accomapnied by a crunch of gears, all of which resulted in the re-build,
> after which everything seemed fine for several months.
> >
> > This spring, when I returned the car to the road after winter storage,
I
> noted that the 3rd gear synchro seems to be acting up. It was fine when
> the car was put into storage. All new synchros were fitted during the
> rebuild.
> >
> > I have noted that the tranny oil level is down a bit, below the low
level
> mark - I don't know how much down this mark signifies. The mechanic who
> did the work - only does Brit Cars by the way, uses 90 weight gear oil in
> all trannies, and this is what he filled my box with. Also, when I drove
> the car, the temperature was quite a bit lower than in the summer when
the
> car gets most of its use.
> >
> > What is the list wisdom on 90 weight in the trans? Could this account
> for my problem? I know that 20W-50 is the normally reccomended fluid.
How
> about the low oil level? Anyone have a feel for how low the transmission
> is if the oil drops below the low mark on the dipstick?
> >
> > Best Regards,
> >
> > Chris Delling
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