[W126 Coupe] Re: 87 SEC hard shift now modulator and B2 piston

[Satish Tummala]

If I recall, you'll have to pull the transmission from the car.



> Hi Rick:
>
> Sounds like a plan re: the modulator.  Perhaps you or someone else on
> the list can help me in understanding the mechanics of R&R for the B2.
>
> My B2 issue is not with the coupe but with the 86 300SE Euro sedan.  If
> you come up with any helpful hints or instructions let me know.  I am
> thinking I need to tilt the transmission valve body downward by raising
> the engine.  Questions, I have a few.  Do I simply support the rear of
> the tranny while remove the cross member and then lower watching for the
> engine contact at the radiator?  Do I need to loosen the engine mounts?
> And will there be enough room along side to pull the old B2 and then
> install the nylon bushing plus the new B2?  I've heard of a few folks
> who say there is no way to get the nylon bushing in there because of
> limited space.  Will it be necessary to drop the exhaust up front and
> disconnect the drive shaft?
>
> Regards,
>
> Dick
>
> Richard Hesek wrote:
>
>>  Thanks for the reply Dick,
>> I have had this same behavior in 2 diesels which are quite different due
>>to the vacuum system.
>> I have tested modulators exactly the way you describe. I have a vac pump
>>but a Mity Vac would be ideal. Modulators fail when the diaphragm tears.
>> A
>>large tear will cause a harder shift and also cause trans fluid to be
>>pulled upstream towards the intake manifold.
>>  I have also replaced a B2 piston, tranny in the car, on my '81 300SD.
>> It
>>was easy provided you have good instructions. I am not sure about the
>>coupe. Although it is a 126 chassis car, there are tight spaces where the
>>sedans have room.
>>  I will replace the modulator since it is cheap the car has 200k+ miles
>> on
>>it. I will let you know what goes on.
>>
>>Rick Hesek
>>
>>
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