12.7 reman capital engine compression coming out of intake manifold

Discussion in 'Questions From New Drivers' started by monte ott, Sep 16, 2021.

  1. lovesthedrive

    lovesthedrive Is here to help

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    If all things check out. Only thing left is a bad cylinder head. Will have to tear it back apart and get the one that is leaking magna fluxed. Magna Flux will show if there is a crack
     
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  3. monte ott

    monte ott Bobtail Member

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    it is reconditioned from Capital Remanufacturing in Colorodo. yes they were lapped and all new springs installed.
     
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  4. Dockbumper

    Dockbumper Road Train Member

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    Have you contacted Capital Remanufacturing? That would certainly be my first stop.
     
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  5. monte ott

    monte ott Bobtail Member

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    camshaft# is 23513565... is there anyway it could be a marine cam and turn opposite directions... I really appreciate you helping me with this
     
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  6. wore out

    wore out Numbered Classic

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    Magnaflux isn’t gonna help here. Lmao


    Couple questions is this all cylinders or just 1?


    Is it a DDECV


    Always verify timing by checking the lift on an injector lobe. The gears are a hunting tooth design and only line up every x revolutions. If it was rolled after the bull gear install then you have a long way to go to get them back in alignment.


    Are you sure the Jakes are set correctly. On a DDECV you use the spacers to bolt it down and set it. Then take it back loose to reinstall the Jakes and spacers. If you picked the rocker shafts up could they have turned?

    they have a flat side for the Jakes to sit. Round side goes on bottom to seal off oil port. If the Jakes were set with them upside down then they were flipped right I can promise they are too tight holding the exhaust valves open
     
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  7. jamespmack

    jamespmack Road Train Member

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    Your 100% on "hunting tooth". I forget the amount, but your arm will want to fall off.
    186 rotations? Idk alot.


    Maybe try starting it with jakes off?

    Plug the holes first.
     
    Last edited: Sep 16, 2021
    Reason for edit: My reading comprehension needs work.
  8. jamespmack

    jamespmack Road Train Member

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    I zero knowledge or info on marine, or off road applications.
     
  9. 062

    062 Road Train Member

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    @benjamin260_6 may know
     
  10. monte ott

    monte ott Bobtail Member

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    we did they do not send anybody out but will send whatever part we need.
     
  11. monte ott

    monte ott Bobtail Member

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    we have a DDECIII
    we installed jakes tried to start, saw we had problem with low compression on all cylinders. we removed jakes, rechecked valve lash & all is good. tried to restart without jakes & still has low compression & spins extremely fast
     
    Rideandrepair Thanks this.
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