Cummings Rebuild

Discussion in 'Trucks [ Eighteen Wheelers ]' started by Atruck, Feb 15, 2017.

  1. Atruck

    Atruck Bobtail Member

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    Feb 15, 2017
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    I would like some input I have a n14 it had lost oil pressure so my "what I thought was a mechanic" put a new cam, followers, rods and mains in it. Now I have a head gasket leaking so my thoughts are to just go ahead and do an inframe. My question is are there anything else I should do or have my new Mechanic replace while he is in it.
     
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  3. strollinruss

    strollinruss Road Train Member

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    There are three heads so maybe can just pull the one head and see what the liners look like.
     
  4. Atruck

    Atruck Bobtail Member

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    Feb 15, 2017
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    Ya I was thinking about that option but I just bought the truck so I'm thinking about doing a full build so I know I will get a good run out of it hopefully. I just wasn't sure if I should change anything else while I was in it. Thanks for the input.
     
  5. snowman_w900

    snowman_w900 Road Train Member

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    Well if your gonna do a full inframe, id also do 3 recon heads, head bolts (unless you measure them for stretch past spec) replace the piston squirters, oil pump, fuel lines going from the heads to the pump to go with it.

    If you have the extra cash......injectors and turbo and balancer.

    Rebuild jakes with new solenoids and slave valves and springs. Whole kit.

    Check all the plastic injector passthru connectors at the rocker boxes.

    Check all push tubes for straightness, check rocker shafts for excessive wear, check rocker arm bushings for excessive wear. Replace those as needed.

    Plastigauge your main caps/bearings. Check the block really good for fretting. Sometimes those main caps will destroy a block from walking around!
     
    Last edited: Feb 16, 2017
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  6. blairandgretchen

    blairandgretchen Road Train Member

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    Everything he said! And,

    From the little knowledge I have in owning one - the front cover bushing to the compressor/fuel pump gets to leaking - I had mine replaced.

    Cam follower gaskets - and I am told the shims affect timing so must be correct.

    I'd replace oil pump. I did piston oilers as well.
     
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  7. OLDSKOOLERnWV

    OLDSKOOLERnWV Captain Redbeard

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    As @blairandgretchen mentioned, replace the bushing and the seal in the accessory drive, you will have to remove the compressor and accessory drive shaft itself for that. This is a Big Cam in the picture but will help illustrate.
     

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  8. OLDSKOOLERnWV

    OLDSKOOLERnWV Captain Redbeard

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    When I bought my truck it had engine failure so I knew it would be a project. DON'T go crazy with silicone..... I found that stuff in the oilpan suction, in the radiator when I recored it, it was everywhere!! Every mating surface on the sides of the engine showed excessive use of red silicone.
     

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  9. Truck engine machinist

    Truck engine machinist Light Load Member

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    You should also replace the cam bearings.
     
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