Need some help have run out of Brain! My 3406e 5EK 550hp is low on power!

Discussion in 'Freightliner Forum' started by brknwng, Jun 14, 2015.

  1. brknwng

    brknwng Bobtail Member

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    sorry I repeated myself! duhh lol
     
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  3. Old Man

    Old Man Road Train Member

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    Boost only comes from turbo and to make boost fuel is fed to engine, so not enough fuel is going to cylinders, plugged line, filter ,bad pump, or clogged air filter, once you have boost, you have to get it to the intake,you loose it thru leaks, leaks will cause high exhaust temps, high enough and you can burn valves. Only other weak link is the turbo, it has to spool up and make pressure, pull a hose off and check to see if you have a lot of play in the wheel.
     
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  4. RustyBolt

    RustyBolt Road Train Member

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    That spray bottle with soapy water you use to find air leaks works really well for finding boost leaks too. Even on the CAC
     
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  5. brknwng

    brknwng Bobtail Member

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    Did the soapy water deal and couldn't find any leaks!
     
  6. RustyBolt

    RustyBolt Road Train Member

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    No leaks is a good thing. Doesn't help with your problem though.

    I mean no offense by this next question.

    Did you have the engine running while checking for leaks? I only say that because I told a fella at a truck stop to do the spray thing and he proceeded to spray everything with the engine off staring at every connection as if bubbles were going to appear. I walked away scratching my head.
     
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  7. RustyBolt

    RustyBolt Road Train Member

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    Any chance a clogged muffler or catalytic converter could cause these issues? The truck sat for a time right? Just thinking that if all else looks good, what else could it be? Unless your precooler went bad. Mine on my C13 went bad. Had some heat issues but never lost boost though. Don't know. Just throwing out suggestions.
     
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  8. brknwng

    brknwng Bobtail Member

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    no offense taken! Been doing the bubble test for years
     
  9. Old Man

    Old Man Road Train Member

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    It ain't going to leak until you have boost, hard to get boost sitting still do a real leak down test with a gauge and compressed air, cap it add 40 lbs air and see how fast it leaks down. Google how to test a cac
     
  10. brknwng

    brknwng Bobtail Member

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    not going to argue the point but it works! as long as the turbine is turning air is going through!
     
  11. Ruthless

    Ruthless Road Train Member

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    Lol and you're the one can't find the leak....surprise!

    The turbine spinning at idle with no boost is essentially at ambient pressure and wouldn't produce much in the way of bubbles. With 30/40 psi you'll find any leaks asap
     
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