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  1. SonicAudio

    Help: LB7 new head studs and cups but still have water leak

    Gave up and used liquid glass! Well it is working so far any way.
  2. SonicAudio

    Help: LB7 new head studs and cups but still have water leak

    They were installed on this mchnist run, I saw him start it, the first time it went to a guy in my town I didn't watch. But the second time it was in the shop( head) I had to take it to Tyler, TX to get done by some one that knew what they were doing.
  3. SonicAudio

    Help: LB7 new head studs and cups but still have water leak

    Sorry on the numbers,, it was two one hundred thousands of a inch off on the #1. On the first tear down I put in all new injectors, new cups, all new seals, an sealed with the red lock tight, then inserted the injectors and torqued before moving on to the next cup. But this head was presure...
  4. SonicAudio

    Help: LB7 new head studs and cups but still have water leak

    Well, magna-fluxed the block, and got the head back from the new machinist, He studied the head gasket also for 30 min with a magnifying glass looking for where the water was leaking. found NOTHING. I then sanded the block and cleaned. cleaned the head studs and added the ARP lube to the threads...
  5. SonicAudio

    Help: LB7 new head studs and cups but still have water leak

    The head passed the presure test, it held 70 psi for 40 minutes, said that the cylender that was leaking had to be ground down .002 (that minor amount could have been from the removal) he wanted to see the gasket that came off. I will post info as I have it.
  6. SonicAudio

    Help: LB7 new head studs and cups but still have water leak

    That was my over use of locktight and red grease I coated the cylenders with on the back valves . That wiped right off with a little smearing with a towl. Also I didn't put the anti-freze in it, it was just distilled water untill I knew It was good to go.
  7. SonicAudio

    Help: LB7 new head studs and cups but still have water leak

    Mine wasent a torque issue at all, checked each one before removing and all were still at 125 on the button even after running! Haven't had the head to the shop yet but as you can see on the 3rd picture down, the valve on the first cylender was weeping water in, gaskets were fine, with no...
  8. SonicAudio

    Help: LB7 new head studs and cups but still have water leak

    got the head off and here is the head picture that had the leak
  9. SonicAudio

    Help: LB7 new head studs and cups but still have water leak

    new set of gaskets on the way from merchant, and a new head guy that that is familiar with the Duramax. will keep everyone informed as it goes.
  10. SonicAudio

    Help: LB7 new head studs and cups but still have water leak

    pressure test leaked coolant to the front passenger cylinder.
  11. SonicAudio

    Help: LB7 new head studs and cups but still have water leak

    thanks all for your replys will be getting on them today and go from there
  12. SonicAudio

    Help: LB7 new head studs and cups but still have water leak

    just got back from running it on interstate and it is using coolant while running! checked the top hose of the radiator before removing the cap of the fill tank and it had a slight vacuum on the hose while it was idling (didnt shut off the truck when the low coolant light came on) and filled it...
  13. SonicAudio

    Help: LB7 new head studs and cups but still have water leak

    Is it to late to re torque them or is it best to just go ahead and just get new head gaskets?
  14. SonicAudio

    Help: LB7 new head studs and cups but still have water leak

    I used the Kent Moore tool to remove The old ones and install the new cups. As each one was lock tight and tapped in I installed the injector and torques the injector before moving to the next cup so that each was seated and had no chance for movement. Btw what is FNG mean by my nick?
  15. SonicAudio

    Help: LB7 new head studs and cups but still have water leak

    inside of cooler was dry as a bone. Will pressure test this weekend and see what I can see
  16. SonicAudio

    Help: LB7 new head studs and cups but still have water leak

    I will upload the install sheet that came with mine as soon as I get off work, mine didn't call for the loosen then re-tighten and I that was required then that is a step I missed!
  17. SonicAudio

    Help: LB7 new head studs and cups but still have water leak

    when you say cycle them 4 times do you mean torqued the nuts to 125 in 4 steps. step 1 - 37lb step 2 - 59lb step 3 - 92lb step 4 - 125lb ?? i did that, lubed the studs with the stuff in the tube that came with them prior to putting them in the block, I also bought the tap to make sure the...
  18. SonicAudio

    Help: LB7 new head studs and cups but still have water leak

    here are a few from the build
  19. SonicAudio

    Help: LB7 new head studs and cups but still have water leak

    here is some of the tear down
  20. SonicAudio

    Help: LB7 new head studs and cups but still have water leak

    no EGR, and yes it had coolant in the oil to start with but not oil in the coolant that is what forced me to do the head gasket and injector cups. well that along with the hydro- locking. now there is no water in the oil (yet) after 5 days of driving and NUMEROUS hours of idol time. when...
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