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Replacing turbos on C 15 Acert

Discussion in 'Trucks [ Eighteen Wheelers ]' started by Roadhound, Oct 8, 2009.

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  1. Oct 8, 2009 #1
    Roadhound

    Roadhound Light Load Member

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    I took my truck to Peterbilt for a high pitch squealing noise under the hood. The noise was on the right side of the engine, so I figured another hump hose had a hole rubbed in it. Turns out that both turbo impeller shafts have play in them and the impeller blades are actually rubbing the turbo housing. So I get to spend $4000 to replace the turbos.

    Luckily, the turbos didn't come apart and damage even more. I was wondering of anyone else has had this problem, and if so, any problems after the replacement. Peterbilt says the turbos have been revised with better shaft bearings. But ####! I don't want this problem ever again.
     
    Roadhound, Oct 8, 2009
    Roadhound, Oct 8, 2009
    #1
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  3. Oct 9, 2009 #2
    Heavyd

    Heavyd Road Train Member

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    Lucky there, good catch!!!
     
    Heavyd, Oct 9, 2009
    Heavyd, Oct 9, 2009
    #2
  4. Oct 9, 2009 #3
    pullingtrucker

    pullingtrucker Road Train Member

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    I have heard of some of the earlier high pressure turbos failing, but not with a shaft or bearing failure. It had something to do with the housing. You got extremely lucky that the compressor wheel didn't come apart. I have been trying to find someone with knowledge to give me a rough estimate of max shaft speed and PSI for the MXS ACERT turbos. So far I have pushed mine to 65 PSI and I am afraid that when I tune it to sled pull that number will get near 75-80 (or more) PSI.
     
    pullingtrucker, Oct 9, 2009
    pullingtrucker, Oct 9, 2009
    #3
  5. Oct 9, 2009 #4
    LargeCar3406

    LargeCar3406 Light Load Member

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    Oct 5, 2009
    Longs, SC
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    im guessing u and this guy here have the same problem, is this what that squeling ur talking about sounds like? im also guessing urs is the twin turbo model too right?


    http://www.youtube.com/watch?v=dQHPBGunBAU
     
    LargeCar3406, Oct 9, 2009
    LargeCar3406, Oct 9, 2009
    #4
  7. Oct 9, 2009 #5
    kalh7

    kalh7 Light Load Member

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    Mar 28, 2007
    southern illinois
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    had a piece of a sleeve i guess that is attatched the exhaust manifold gasket come loose awhile back. got into both turbos, also had the different pitch noise. drove me nuts cause i couldnt figure out what the problem was, looked at everything. finally said the hell with it and took it to a shop that previously replaced a turbo that blew. found out it tore the hell out of the turbine wheels on both turbos.

    cat paid for everything. both turbos, gaskets, studs for manifold. they said they knew about the problems with the sleeves and are only paying for it as they go out.
     
    kalh7, Oct 9, 2009
    kalh7, Oct 9, 2009
    #5
  8. Oct 9, 2009 #6
    V8Lenny

    V8Lenny Road Train Member

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    Some turbo specialist should be able to give you a rough estime about max shaft speed if you give him the measurements of the turbine and compressor wheels. Theres some max peripheral speed that I don't remember now that you shouldn't go over. You should have 2 boost gauges, 1 for LP and 1 for HP side so that you know the pressure ratio of both of the turbos, max pressure is not so important.
     
    V8Lenny, Oct 9, 2009
    V8Lenny, Oct 9, 2009
    #6
    Chickentrucker20 Thanks this.
  9. Oct 9, 2009 #7
    Jfaulk99

    Jfaulk99 Road Train Member

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    Garrett sells a turbo speed sensor. Only downfall is you have to drill the compressor housing to install. I guess it comes with blueprints so you could have a machine shop do it.
     
    Jfaulk99, Oct 9, 2009
    Jfaulk99, Oct 9, 2009
    #7
  10. Oct 10, 2009 #8
    V8Lenny

    V8Lenny Road Train Member

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    Some modern engines have it from the factory, like S 60 Detroit, new Ivecos and Scanias with VGT Turbo.
     
    V8Lenny, Oct 10, 2009
    V8Lenny, Oct 10, 2009
    #8
  11. Oct 10, 2009 #9
    Jfaulk99

    Jfaulk99 Road Train Member

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    I knew the VGT's did but you can add this to anything.
     
    Jfaulk99, Oct 10, 2009
    Jfaulk99, Oct 10, 2009
    #9
  12. Oct 11, 2009 #10
    Roadhound

    Roadhound Light Load Member

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    Jan 31, 2007
    Tennessee
    0
    Mine would only squeal at about 35 psi and up and wasn't blowing smoke. I think as the boost would build, the shafts would flex or move, allowing the impellers to rub against the housing. I have already had the manifold sleeves and bolts replaced about 50,000 miles ago.
     
    Roadhound, Oct 11, 2009
    Roadhound, Oct 11, 2009
    #10
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