On Thu, 28 Aug 1997 11:43:29 -0700 "S. L. Hower" <howersl@mailexcite.com>
writes:
>
>
>>I've returned to the MG list to share / retreve data from fellow MGB
>owners.
>>Its been a few years since I signed off, and many things have
>happened.
>
>Welcome back!
>
>>Now the overdrive transmission is starting to flake out, and I need
>help.
>>The clutch shutters when releasing and has done so ever since I
>replaced the
>>original clutch (not related to lightened flywheel). The OD unit is
>working
>>but only when gas is applied. The unit drops out when coasting
>downhill or
>
>First clue...
>
>>decelerating. Typically it jumps back and forth, in and out, until
>gas and
>>acceleration is resumed. Anyone with ideas?? I measured the hyd
>system
>>pressure and found that the needle fluctuated wildly but dont know if
>thats
>>normal. The average value of the fluctuation is about 420 psi and
>normal.
>
>Second clue...
>
>
>Richard,
>
>The fact that you have decent pressure leads to be suspect your
>problem is electrical
>rather than mechanical.
>
>There is a switch that limits O/D engagement in the side of the
>overdrive gearbox.
> The nose of said switch is depressed as you engage 4th gear. With
>time, the plunger
>inside the switch wears away and produces the symptoms you describe.
>Eventually
>the O/D will not engage atall. You may want to check this; the switch
>is about ~$10.
>
Good idea, I hadn't thought of an electrical problem, since our MGs
have Lucas systems that never seem to falter. That switch is a real
stinker to remove, but you might see if you can poke the wire off with a
long screwdriver and jumper the switch test it. The OD works when the
positive wire is allowed to ground through the OD, as the switch is
closed when in 4th.
Bob
>--Scott
>
>Scott Hower -> howersl@mailexcite.com
>
>73 MGB
>78 Midget
>
>
>
>
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