replacing vacuum modulator?

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Big Richard - 12 Jun 2006 13:48 GMT

IS there any adjustment required when installing a new vacuum modulator?

mine was perrished and allowing trans fluid to be sucked into the engine.

1979 6.9

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Tiger - 12 Jun 2006 14:12 GMT

Yes, you need to adjust the vacuum modulator after you install it.

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Big Richard - 12 Jun 2006 14:47 GMT

how does one go about this ?

> Yes, you need to adjust the vacuum modulator after you install it.

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Tiger - 12 Jun 2006 19:54 GMT

Technically it needs to be done by a pressure gauge attached to the
tranny... but you can get close enough by the feel of shifting... adjust it
to the same firm shifting as original.

If you look at the modulator... take that rubber cap off... inside there is
a T key... slide it out a bit... and turn it... Clockwise to firm up the
shifting... reverse for softer shifting.

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Richard Sexton - 15 Jun 2006 18:13 GMT

>IS there any adjustment required when installing a new vacuum modulator?

Usually. But if it shift fine with respect to hashness/smoothness of the
shifts when installed, then, no.

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Richard Sexton | Mercedes stuff: http://mbz.org
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TPr - 16 Jun 2006 00:32 GMT

| >IS there any adjustment required when installing a new vacuum modulator?
|
| Usually. But if it shift fine with respect to hashness/smoothness of the
| shifts when installed, then, no.

I never had a vacuum modulator when i purchased the car 2 years ago, it was
plugged off and perrished, the shifts were harsh.

Ive totaly restored the car externaly, also removing the engine and trans
stripping and rebuilding, also rebuildign the front end etc.

the new modulators stock calibration gives little to no hydraulic pressure,
one has to drive like a grandmother. disconnecting the vacuum line, ie, full
pressure, gives neck snapping gear shifts. I Thought there would be
something to adjust ;)

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