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Re: [Mgs] Overdrive Diagram

To: Lawrence Swift <lawrence.swift@gmail.com>
Subject: Re: [Mgs] Overdrive Diagram
From: Simon Matthews via Mgs <mgs@autox.team.net>
Date: Sat, 19 Jan 2019 08:48:32 -0800
Cc: MGS <mgs@autox.team.net>
Delivered-to: mharc@autox.team.net
Delivered-to: mgs@autox.team.net
References: <67002791.1218896.1547752405682.ref@mail.yahoo.com> <67002791.1218896.1547752405682@mail.yahoo.com> <35E385F4-A820-4D33-9B0B-19DDC19D306E@sonic.net> <08647baa-e234-77d1-b5f6-70765d0c803b@bell.net> <E1C82B8D-FB34-468A-8B5E-F295233DD0DD@gmail.com>
I use Redline MT 90 (I think), which has not resulted in any leaks.

Simon

On Fri, Jan 18, 2019 at 5:42 PM Lawrence Swift via Mgs
<mgs@autox.team.net> wrote:
>
> I used synthetic which resulted in enormous leaks; went back to 30 wt ND - 
> now no problems.
>
> On Jan 18, 2019, at 12:51 PM, Barrie Robinson via Mgs <mgs@autox.team.net> 
> wrote:
>
>   Hello folks
>
> I know not if his helps but in matters of transmissions I would use 
> synthetic.  I had a new Maserati Biturbo and when cold had a very sticky 2nd 
> gear and "running it in" was not my idea of fun.   Dealer said Alfa Romeo had 
> had success with synthetic as they also had a sticky 2nd.  So synthetic went 
> in - HUGE success - never had tough 2nd gear again.
> <Barrie' signature for emails.jpg>
>
>
>
> On 1/17/2019 6:41 PM, Max Heim via Mgs wrote:
>
> Are you sure it isn't the gear oil?
>
> The factory has always called for engine oil. There has been a lot of 
> ridiculous debate over precisely what grade of engine oil (personally, I 
> donâ??t think it matters, but letâ??s not start that), but there is certainly 
> a large difference in viscosity between say 20W50, and 85W90. The overdrive, 
> unlike the rest of the transmission, uses oil in a hydraulic function, not 
> just as splash lubrication, so viscosity is probably very important.
>
> --
> Max Heim
> mvheim@sonic.net
>
>
>
> On Jan 17, 2019, at 11:13 AM, Jack Wheeler via Mgs <mgs@autox.team.net> wrote:
>
> Does anyone have a good exploded diagram of the overdrive unit used in a 1971 
> MGB, that you could send to me?  I am particularly interested in the pump 
> assembly.  I changed the oil in my gearbox this week, using EP 85/90 GL-4 
> gear oil, as recommended in a recent article in the MG Driver magazine.
>
> While the car was up in the air, I noticed a leak around the plug which holds 
> the pump assembly in place.  So, I removed the pump, careful to keep all the 
> pieces in the order in which they came out.  I cleaned everything up, and 
> reinstalled the pump assembly and plug (part number 466-315 in the Moss 
> catalog), with a new gasket.  I thought I had all of the pieces of the pump 
> assembly (items 62-66 in the Moss diagram) in the right order when I 
> reinstalled it, but when I took the car out for a test drive, the overdrive 
> would not engage.
>
> In addition to trying to keep the pieces in the order in which they came out, 
> I also used the exploded diagram in the Moss catalog (Page 41) as a guide.  
> The Moss diagram, however, is different than my overdrive unit.  Moss says 
> their diagram is for cars from 1968 to 1980, but apparently, some things were 
> changed during that time frame.  I can't believe the engineers would let 
> anything go unchanged for 12 years!  It looks like the plunger (Moss part 
> number 466-305) shown in the Moss catalog diagram has a roller on the end of 
> it.  My plunger does not have a roller on the end of it.  Maybe this will 
> give you a lead to which diagram I am looking for.
>
> So, that leaves me looking for a good exploded diagram of the unit used in a 
> 1971 model.  Can anyone help with that, or does anyone have any suggestions 
> as to what I might have done to make the overdrive not work, when it has 
> always worked fine.  Thanks.
>
> Jack Wheeler
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