Vacuum Box (126 270 91 79) [Star Wiki]

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====== Vacuum Box (126 270 91 79) ======

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<image shape="responsive">{{ parts:1262709179.jpg }}</image>
**Part number(s)**:  126 270 91 79 \\
**Used on**: 722.3, 722.4, 722.5
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===== Removal =====
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  - Locate vacuum modulator on left side of transmission
  - Unplug vacuum line from intake manifold
  - Remove 2x 5mm allen screws holding bracket to transmission case
  - Pull vacuum modulator out or pry gently with screwdriver
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{{ transmissions:7223removevacuummodulator.jpg?300 }}
<caption>Loosening screws on vacuum modulator </caption>
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<caption>Old vacuum modulator removed</caption>
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===== Installation =====
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  - Clean the surface area on transmission case where vacuum modulator is installed
  - Assemble vacuum modulator pieces
    - Thrust pin
    - Turn key and cap
    - Mounting bracket
    - O-ring
  - Insert vacuum modulator assembly
  - Tighten 2x 5mm allen screws
  - Reattach vacuum line from intake manifold
  - Replace old vacuum line parts if necessary
    - 117 997 09 82 - Rubber vacuum connector
    - 117 078 05 81 - Vacuum elbow
    - 116 276 06 30 - Plastic vacuum line (black)
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<thumbnail>
{{ transmissions:7223cleanvacuummodulatorsurface.jpg?300 }}
<caption>Clean vacuum modulator mating surface </caption>
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<caption>New vacuum modulator installed</caption>
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===== Adjustment =====
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<image shape="responsive">{{ transmissions:7223modulatorpressure.png }}</image>
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<image shape="responsive">{{ transmissions:7224modulatorpressure.png }}</image>
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  - Disconnect vacuum line from modulator
    - Plug the intake manifold line to prevent leak during testing
  - Locate tester port near bottom right of vacuum modulator on transmission case. Remove 12mm hex screw cover.
  - Thread pitch for this hole is M8x1.0. Use an engine oil pressure tester kit and connect the gauge to this port.
  - Drive vehicle at 30mph with selector in D and read pressure value off gauge
    - Although the proper procedure is to perform measurements while car is moving, the same pressure could be measured by idling in D at a complete stop.
  - Adjust pressure by removing the turn key cap and turning the key clockwise or counter-clockwise
    - Clockwise rotation increases pressure by approximately 6psi
    - Counter-clockwise rotation decreases pressure by approximately 6psi
  - When complete, remove testing gauges and reconnect vacuum line
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{{ transmissions:engineoilpressuretestkitfront.jpg?300 }}
<caption>Engine oil pressure test kit</caption>
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<caption>Adapter we need for testing port.</caption>
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{{ transmissions:7223pressuretestconnected.jpg?300 }}
<caption>Pressure testing kit hooked up with an elbow piece</caption>
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{{ transmissions:vacuummodulator58psi30mph.jpg?300 }}
<caption>Achieving 58psi @ 30mph</caption>
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