Leaky Dash Tractor valve?

Discussion in 'Trucks [ Eighteen Wheelers ]' started by Hanadarko, Aug 4, 2010.

  1. Hanadarko

    Hanadarko Independent Owner/Operator

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    For the smaller ones and hard to squirt at, I take a q-tip with soapy water. It doesnt always bubble, but you can hear the hiss change as the liquid hits a leak.

    I cant tolerate leaks. Thats why I hate plumbing....really hate plumbing.
     
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  3. bender

    bender Road Train Member

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    The valve is metal? Not white or black plastic?
     
  4. Hanadarko

    Hanadarko Independent Owner/Operator

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    OMFG....I had no idea...:biggrin_25521: --- I presumed it was metal. It is NOT!

    This thing IS plastic...and I really cranked on the brass fittings too. I wonder how I didnt damage it...

    The original one had pipe dope gook on the threads, so I had figured tape was OK to use. It didnt push the tape out at all (At least not OUTWARD) but I wrap the tape really tight into the brass threads.

    Now what...? - since I am replacing all of these parts, what is the RECOMMENDED way to reattach these? - I used tape and simply turned them until the bottomed out...I used a needle nose vise-grips, since I cant find a 19mm THIN wrench..so although the valve says MAX 10 ft lbs of torque, I probably didnt go TOO much father since I was using a 'hack' of a tool to tighten.
     
  5. bender

    bender Road Train Member

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    They have that 10lb torque for the fittings due to the taper made into pipe thread fittings to avoid cracking the valve boss. At this point I would lightly tape threads (2 wraps) then press tape into threads between fingers. Then install them snug, but don't crank on them. The tape acts as a lubricant and can fool you on how tight the fitting is and you can pop the boss on the valve.
     
  6. bender

    bender Road Train Member

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    You may want to keep your old valve. It is still serviceable with a kit.
     
  7. Hanadarko

    Hanadarko Independent Owner/Operator

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    I took it out of the trash....just for that purpose.

    Great minds think alike :biggrin_25514:
     
  8. bender

    bender Road Train Member

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    Well, some people don't like a bunch of stuff around or don't have room for it. I like to save money when possible. It's the same as making more.
     
  9. lilillill

    lilillill Sarcasm... it's not just for breakfast

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    Here's a thought...

    When I first started back driving a couple years ago, the company I applied at didn't really have any trucks available, sooooo.... they exhumed the body of an old 9200 and sent it off to Dr. Frankenstein to be revived. They got its' heart beating again, but it leaked more oil than the Exxon Valdez and the air compressor was doing all it could do to keep the brakes released (with all the air leaks).

    Now I've never seen a steam powered locomotive in person before, but I'm pretty sure all the air leaks that truck had, probably closely resembled the sound of one running at full tilt. Thing is though, after driving it a while, a lot of the leaks cured themselves. The o-rings and stuff probably got a little crusty while the truck was sitting and just needed to be used a little before they sealed up again.

    If yours has been sitting a while, it might do the same.
     
  10. Hanadarko

    Hanadarko Independent Owner/Operator

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    I contacted Bendix today. (I was bored...)

    "When reconnecting threaded ports use a liquid thread sealing compound, attach the air line until it is hand tight and then turn approximately one and a half turns further (or using a maximum of 10 ft.- lbs. torque - Note: over torquing will crack the port)."

    ...there it is from the company themselves. I have 2 tubes of pipe dope. One has TFE and is the recommended one as the "regular" pipe dope says not to use with Plastics or Nylon.

    Here is the photo of the Eaton Weatherhead fastener that replaces the old original black unit:

    [​IMG]
     
    Last edited: Aug 11, 2010
  11. haider99

    haider99 Medium Load Member

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    Hi people,

    I have been having similar issues as what the OP posted. When I push tractor brakes and drive around the truck I hear a low hissing sound from the dashboard. I tried twisting the yellow valve and it did not go away however, when you drive its more then when it is parked.

    Tomorrow I will be soaping the air system to see if I could find it. Last week I got the foot valve replace because the brakes were not working fine.

    I remember, once in a volvo my mechanic replaces the Quick Release Valve and the problem went away. This time I want to try myself and see if it is Quick Release Value or the valve in the dashboard...would I be able to replace myself? I am good with my hands and work on cars and stuff. What are the precautions I have to take especially with the fittings?

    Please let me know, thank you.
     
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