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  #1  
Old 04-16-2013, 10:12 PM
whunter's Avatar
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Location: Metro Detroit, Michigan
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1262704079_Blue 722.418 vacuum modulator

Very odd corrosion failure of the vacuum box (vacuum modulator).

Symptoms:

* Over the past year, there has been a steady progressive power loss.

* This evolved over the past three weeks into a hyper speed Hammering up shift = hitting fourth gear at 24 - 28 MPH.

* Once in fourth gear, it would not kick down.

The leaking vacuum modulator was diagnosed and a new part ordered from the local dealer Tuesday of last week, and the part arrived seven days later..

During removal, the old unit steel band crumbled, as displayed in the following pictures.


.












After installing, and adjusting the new unit..

The test drive left the owner with a giant GRIN.

The Hammer and hyper shift are gone.
The missing power has returned.
Kick down is flawless.



.
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Thermal & Aerodynamic System Engineering (TASE) Senior vehicle instrumentation technician.
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Dynamometer.
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Last edited by whunter; 04-17-2013 at 06:20 AM.
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  #2  
Old 04-17-2013, 01:59 AM
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Did the car go for a swim?

Had it been parked in a big puddle?
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Don't leave that there - I'll take it to bits!
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  #3  
Old 04-17-2013, 05:23 AM
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Answer

Quote:
Originally Posted by Stretch View Post
Did the car go for a swim?

Had it been parked in a big puddle?
No, and no..


.
__________________
ASE Master Mechanic
asemastermechanic@juno.com

Prototype R&D/testing:
Thermal & Aerodynamic System Engineering (TASE) Senior vehicle instrumentation technician.
Noise Vibration and Harshness (NVH).
Dynamometer.
Heat exchanger durability.
HV-A/C Climate Control.
Prototype Vehicle build.
Prototype Fleet Durability
Prototype vehicle instrumentation.
Technical Quality Auditor.
Automotive Technical Writer

1973 300D
1973 309D - stolen
1978 280SE
1980 240D
1983 300D
1984 190D
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  #4  
Old 04-17-2013, 04:35 PM
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It sure looks like old "Mr. Salty" got to the steel band.
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1991 Volvo 245 Wagon Nice AZ Restored Gold Brick
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  #5  
Old 04-18-2013, 10:33 AM
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Agree

Quote:
Originally Posted by pwjeep View Post
It sure looks like old "Mr. Salty" got to the steel band.
The salt got it.
I am keeping it as a show piece for tech sessions.

.
__________________
ASE Master Mechanic
asemastermechanic@juno.com

Prototype R&D/testing:
Thermal & Aerodynamic System Engineering (TASE) Senior vehicle instrumentation technician.
Noise Vibration and Harshness (NVH).
Dynamometer.
Heat exchanger durability.
HV-A/C Climate Control.
Prototype Vehicle build.
Prototype Fleet Durability
Prototype vehicle instrumentation.
Technical Quality Auditor.
Automotive Technical Writer

1973 300D
1973 309D - stolen
1978 280SE
1980 240D
1983 300D
1984 190D
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