Mark:
It is easy to check the reverse lock out switch. With the ignition on,
actuate the OD switch.
Check for power at the OD solenoid lead under the transmission. Have
someone put the gearshift in reverse and make sure that there is no
power to the solenoid when the shif lever is wobbled around in the
reverse detent.
While you are there, check the 3-4 lockout switch too.
It would be a good idea to pull the coil feed wire, just to make sure
there is no way the motor can start while you are under the car
checking.
Unfortunately this problem sounds more like a slipping planetary clutch
though.
Kelvin Dodd
> -----Original Message-----
> From: mgs-bounces+doddk=mossmotors.com@autox.team.net
> [mailto:mgs-bounces+doddk=mossmotors.com@autox.team.net] On
> Behalf Of mark.jones@exxonmobil.com
> Sent: Tuesday, January 29, 2008 11:37 AM
> To: mgs@autox.team.net
> Subject: Re: [Mgs] Overdrive Noise/Shifting Problem
>
> I have the exact same thing happen to my car. The loud whine
> in reverse is due to the reverse overdrive lock out
> switch/circuit not working and allowing the overdrive to be
> "engaged" while in reverse. You really should check the
> circuit and check the lockout switch, probably the lockout
> switch needs replacing. Unfortunately it is on top of the
> tranny and very hard to get to with the tranny in the car,
> although not impossible. If the overdrive continues to
> operate while in reverse you may do damage to the overdrive clutch.
>
> Mark
> 73 MGB GT
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