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Vacuum Transducer or Amplifier Replacement
 
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Pelican Technical Article:

Vacuum Transducer or Amplifier Replacement

Steve Vernon

Time:

30 minutes30 mins

Tab:

$325

Talent:

*

Tools:

Philips head screwdriver

Applicable Models:

Mercedes-Benz 300TD (1979-85)

Parts Required:

Vacuum transducer

Hot Tip:

Careful working with the lines

Performance Gain:

Smoother transmission operation

Complementary Modification:

Coolant flush

Part of the boost, fuel and vacuum control system on the 300TD is the vacuum transducer or sometimes referred to as the vacuum amplifier. Both the amplifier and switchover were deleted with the introduction of the P2 boost control system in later models. The vacuum amplifier modulates the vacuum and boost signal to control the vacuum feed to the transmission. If yours is starting to act up, make sure you check the rubber elbows that enter the amplifier before replacing it as the amplifier very rarely fails but the vacuum lines do dry out, degrade and fail over time.

Over the years your car may have been serviced by multiple people including previous owners and this can lead too parts replaced with different size fasteners and hardware. The sizes of the nuts and bolts we give may be different from what you have so be prepared with different size sockets and wrenches.

Our vehicle may vary slightly from yours as Mercedes redesigned systems and sub-system as the models developed over the years. If something is different on your vehicle please let us know and share your info to help other users. If you have any questions or comments or even a different procedure you would like to share please leave it below and please leave your vehicle information.

The vacuum transducer or amplifier is located on the rear left side of the engine compartment beside the brake booster (red arrow).
Figure 1

The vacuum transducer or amplifier is located on the rear left side of the engine compartment beside the brake booster (red arrow).

There are two vacuum lines that enter the amplifier from the top; these simply pull out from the nipples on the top (red arrow).
Figure 2

There are two vacuum lines that enter the amplifier from the top; these simply pull out from the nipples on the top (red arrow). There is a small slit in the nipple surrounds that allow you to insert a small flathead screwdriver and help lift the hoses off. Make sure you mark the lines before removing them.

If your problem is the rubber lines entering the amplifier you can separate them and just replace these.
Figure 3

If your problem is the rubber lines entering the amplifier you can separate them and just replace these.

The amplifier comes with a new bracket.
Figure 4

The amplifier comes with a new bracket. Use a Philips head screwdriver and remove the two screws holding the amplifier to the inner fender.

With the amplifier and bracket removed check and replace or remove the two vacuum lines on the bottom (red arrows) making sure to label them before removal.
Figure 5

With the amplifier and bracket removed check and replace or remove the two vacuum lines on the bottom (red arrows) making sure to label them before removal. Installation is the reverse of removal.

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Page last updated: Mon 12/5/2016 02:59:56 AM