Not sure what this airline is running to

Discussion in 'Heavy Duty Diesel Truck Mechanics Forum' started by 85COE, Apr 30, 2024.

  1. 85COE

    85COE Light Load Member

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    This is a braided line with a hydraulic fitting on the governor, going across the top of the engine into this. It appears it has something to do with the cooling system, cuz those blue lines as far as I'm aware are water lines.

    Any idea what this is?

    This is on a 300 Cummins that is in the 85 Volvo white cabover that I've posted about before.

    Thank you
     

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  3. Big Road Skateboard

    Big Road Skateboard Road Train Member

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    Heater control valve? That may be the dumbest guess ever
     
  4. 85COE

    85COE Light Load Member

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    I'm just wondering why it would need air
     
  5. Big Road Skateboard

    Big Road Skateboard Road Train Member

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    IDK, Freightliner used air to control bunk heater valves for years
     
  6. 85COE

    85COE Light Load Member

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    The vents that are in the bank are controlled by the front. So the front vents have to be on in order for the bunk events to be on
     
  7. Big Road Skateboard

    Big Road Skateboard Road Train Member

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    Original engine? Fuel heater? Just throwing guesses out
     
  8. Star Rider

    Star Rider Road Train Member

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    It's the clutch fan sending unit. The braided line is the supply, when the temp gets high enough it opens and sends air through the plastic line to the fan. ( or shutters if it's that old) If I reacall correctly they are called a shutterstat.
     
    Last edited: Apr 30, 2024
  9. Big Road Skateboard

    Big Road Skateboard Road Train Member

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    Learn something every day. Cool info!
     
  10. 85COE

    85COE Light Load Member

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    I'm trying to figure out a better way than this cluster fart. The braided air line is on top. It keeps working it's way out from the governor. Costs me an hour plus every time to fix it.

    I've used the thread tape and lock tite
     

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  11. Star Rider

    Star Rider Road Train Member

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    Replace it with plastic line.
     
    Hammer166 Thanks this.
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