2006 5.9 Cummins with rear gear train

Discussion in 'Heavy Duty Diesel Truck Mechanics Forum' started by WrenchWrenchWrench, Apr 21, 2019.

  1. WrenchWrenchWrench

    WrenchWrenchWrench Light Load Member

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    Anybody have experience with one of these? Working on a bunch of Freightliner MT45 delivery trucks and I've got 4 or 5 with what appears to be rear main leaks. But I know the rear gear train version might have wet flywheel housings. I pull the bottom plug out of the flywheel housing and get some oil out of it. Any body know how to figure out if I have a wet or dry flywheel housing? Freightliner cant tell me and neither can Cummins even with the ESN, and quickserve just shows the different options.
     
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  3. Goodysnap

    Goodysnap Road Train Member

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  4. Goodysnap

    Goodysnap Road Train Member

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    If you look at the back corners where the oil pan rail bolts up you can see it. The dry housing engine has an aluminium rear main seal cover that is separate from the flywheel housing. The wet has no cover and the seal is contained within the housing.

    Have you looked at the parts breakdown by ESN?
     
    WrenchWrenchWrench Thanks this.
  5. WrenchWrenchWrench

    WrenchWrenchWrench Light Load Member

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    ESN is 46527184. Its a common rail 5.9. The parts breakdown on quickserve shows just the flywheel housing and seal. The weird thing is I can't see any sign of a gasket between the flywheel housing and transmission, or between the starter and flywheel housing. And the plug to access the flex plate bolts is just a rubber push in plug, not a threaded plug like you think a wet flywheel housing would have.

    To further complex things, I need to get these things resealed and if it is a rear main seal leaking into a dry housing and weeping out the joining areas, there is apparently two different types of seal its possible to have, a lip seal that seals on the crank and a two piece seal that seals in itself. Different installers for both so I'm not sure which tool I will need once I have it apart. If I google the part number that quickserve shows me, it looks like the two piece. I guess I'll get that installer and cross my fingers.
     
  6. Goodysnap

    Goodysnap Road Train Member

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    The gasket on the seal cover and the flywheel housing is inlayed in the cover as a rubber rope type, so it wont be visible from outside. If dry, get the new housing with the seal as there are updated numbers as it sounds like you have found.

    The seal remover/installer is different number between the two styles, so make sure you get the right one.
     
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  7. WrenchWrenchWrench

    WrenchWrenchWrench Light Load Member

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    If its dry do you have to remove the seal housing to replace the seal? Looking at quickserve online it looks like with the correct installer and remover it can be done as soon as the flywheel is pulled off the crank? Thanks for your help btw.
     
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  8. Goodysnap

    Goodysnap Road Train Member

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    You will have to remove the housing on the dry, from memory as the rear seal cover is behind the fly housing. I may be wrong here, but you'll know for sure once the flywheels off.

    The wet should be pull the seal and push in the new w/o removal of the housing.

    Often the cover gasket to block leak on the dry housing, that's why I say do it all with the update and cover.

    Dont mess with the older 5.9 much. But the newer 6.7 ISB is similar.

    Your welcome
     
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