N14 Celect tear down.

Discussion in 'Heavy Duty Diesel Truck Mechanics Forum' started by mile marker 27, Mar 3, 2024.

  1. mile marker 27

    mile marker 27 Road Train Member

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    So, I’m tearing down the N14 Celect 460, CPL 1580. Initial issue was total loss of power, excessive crankcase pressure, still good oil pressure. Drained coolant and drained oil and oil pan had about 8- 10 gallons of coolant in the bottom of pan. Oil still had its color and wasn’t milky. Valve covers, jakes, manifolds, turbo and rocker boxes are off. Gonna try and get the heads off and oil pan dropped today. My guess is cracked or blown piston.
     
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  3. goforce

    goforce Light Load Member

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    Cracked Piston or Piston will not account for water in crankcase. Look at head gaskets and liners close.
     
  4. mile marker 27

    mile marker 27 Road Train Member

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    Maybe cracked liner? I’ve never seen pin holes in a liner cause that much crankcase pressure, especially all the sudden. Would a head gasket do the same? Not being critical, just saying I ain’t seen it. There was enough crankcase pressure to back feed oil into the turbo from the return line and put oil into the A2A.
     
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  5. Goodysnap

    Goodysnap Road Train Member

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    Next time drop the pan and find out where the coolant is coming from.

    What condition was the cooling system in? Green or red? Watered down and rusty? Can you test it?
     
  6. W923

    W923 Road Train Member

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    Water in the pan could be from a cracked liner but I don’t think there’s much if any chance of that making crankcase pressure. I don’t think the head gasket would let that much through either…it’s pretty much a piece of sheet metal. Did it have lots of pressure in the radiator? Possibly a piston broke which will cause tons of blowby and wedged in the liner and cracked it letting the water in
     
  7. Last Call

    Last Call Road Train Member

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    This ^^^^^^ I guess I would of dropped the pan and pressurized the cooling system
    There is the chance it has a cracked head after all it is a cumm-a-part
     
  8. mile marker 27

    mile marker 27 Road Train Member

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    IMG_5167.jpeg IMG_5166.jpeg IMG_5168.jpeg
    1,3,5 and 6 are scoured down into the rings. Liners don’t look near as rough as the pistons. Rod bearing don’t look as bad as I thought. Pulled 3 main caps and they look and feel ok. I didn’t see anything indicative on the head gaskets but I’m not necessarily the mechanic y’all are. Nothing looks damaged at the valves. I’ll try and get the liners pulled this week.
     
  9. YardMule89

    YardMule89 Road Train Member

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    Because a CAT would never cracked a head.
     
  10. Last Call

    Last Call Road Train Member

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    Lol you said it I didn’t :biggrin_25523: I have nothing against a Cummdumper as long as I never own one
     
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  11. W923

    W923 Road Train Member

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    Those pistons look like ###
    Bearings look surprisingly good for how much junk has probably been floating around in the oil
    Did it get hot?? Seems odd to have that many pistons looking that bad. Also thought they had gone to 2 part steel top pistons on all n14s above?370? Hp
    I think I remember you saying this on was 460?
    Just judging by the soot on the bottom of the heads it looks like it was relatively healthy and I would be pretty certain the water wasn’t coming in above the pistons
     
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