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4" Exhaust!!!!!

Discussion in 'GM 6.5 Diesel Engines' started by Deere Freek, May 21, 2008.

  1. Deere Freek

    Deere Freek Recruit

    333
    0
    May 5, 2008
    Hastings, MI
    I'm getting a 4" exhaust and downpipe. Wondering if there was anything else i should do to it while the old one is off.

    btw this will be my first mod to the truck!!!!
    unless you coun't removing the turbo silencer which did absolutely nothing. I wonder how much GM paid some engineer to design that stupid thing.
     
  2. DEERE3594

    DEERE3594 I welcome everyone...not just Penguins!

    5,009
    4
    May 5, 2008
    NE Ohio
    Did you do your cross over yet?
     
  3. iamdave0887

    iamdave0887 Here Comes Chaos.....

    1,657
    0
    May 5, 2008
    CT
    the crossover can sometimes be a real bitch. i had an oil leak from a valve cover and it kept the bolts from rusting up on one side. the other side wasn't so bad. what i did was grab an impact gun and allow only 25 psi or so to the gun from the regulator on your air compressor. this way you have less of a risk of snapping the bolt off. i would slowly work at it with the impact hammering at it but not putting constant pressure on it like a ratchet or breaker bar would. i managed to get all 6 bolts out without breaking a single one and this truck lived in rhode island which is one of the states that cars rot out in very quickly.
     
  4. Deere Freek

    Deere Freek Recruit

    333
    0
    May 5, 2008
    Hastings, MI
    It's coming with the exhaust. Is there anything i should do with the old off, something that might be inaccesible otherwise?
     
  5. JiFaire

    JiFaire Lieutenant Staff Member Lead Moderator

    7,596
    173
    Feb 10, 2008
    Alberta, Canada
    No, but start putting PBlaster on the nuts now... let 'er soak for a few days before you undo things. You might also want to do the candle-wax thing if they're even a little stiff... breaking off those crossover bolts can be a real pain.
     
  6. ServiceOnSite

    ServiceOnSite New Member

    12
    0
    May 21, 2008
    what is this candle wax thing??? never heard of that. i just had to put an oil pump in my 95 3500hd and the crossover pipe came off just fine. i will have to add that this is a summer only truck and does not see the newyork winter salt so...............................................:yesnod:
     
  7. JiFaire

    JiFaire Lieutenant Staff Member Lead Moderator

    7,596
    173
    Feb 10, 2008
    Alberta, Canada
    Heat up the nut with a propane torch and then stick a candle into the edge between the nut and stud... the wax will 'wick' right up into the spaces between the nut and stud.

    works sometimes better than penetrating fluids... as the nut is already expanded a bit from the heat, and once the wax gets in there, it starts following the threads.
     
  8. JMJNet

    JMJNet Recruit

    1,930
    95
    May 6, 2008
    Richardson, TX
    If you have a new system, the DP is hold with a clamp. The rest, you can just cut them up at a couple of spot. Unless you want to keep the original, then you can do it nicely.
     
  9. pgguru

    pgguru Recruit

    There is a Glow Plug behind the Down Pipe that will be a lot easier to remove with the down pipe off.
     
  10. Deere Freek

    Deere Freek Recruit

    333
    0
    May 5, 2008
    Hastings, MI

    Should it be replaced at 70k miles? if so can i get a good one at napa?
     
  11. Turbine Doc

    Turbine Doc Just Another Diesel Guy

    Way to do it is use plenty of PB Blaster, then put on breaker bar and apply firm torque tension to the lefty loosey direction; with firm pressure applied, then whack with hammer the flex joint of the breaker, works the same as low pressure impact but it's not whacking as hard/often. Key is constant firm pressure, if you just to a quick yank on the breaker you'll snap it off or round the fastner, also use 6 pt vs 12 pt socket. Worked on every crossover bolt I've done thus far, plus it's the way I do hi tension jet engine super heated fasteners.

    With down pipe off get them pesky gnd straps hidden in that area, plus check to see that starter brace is tight/still there.
     
  12. Gunner0812

    Gunner0812 A(ACLU) Agent Mini Gunner

    2,541
    1
    May 3, 2008
    Dayton, Oh.
    Thats good idea! I'm going to order crossover/ DP on the 1st. Plus check out the starter!:D
     
  13. Deere Freek

    Deere Freek Recruit

    333
    0
    May 5, 2008
    Hastings, MI
    What if I wanted to put a mitsubishi turbo on like TD did while i was at it. Kinda tempting, especially if Heath makes a program for it. anyway back to the question, does that change anything?
     
  14. Turbine Doc

    Turbine Doc Just Another Diesel Guy

    You could add the turbo now or wait until we get a program tailored to the TDO-7 if there are changes to be made, I've only discussed it on phone he/they have not seen it yet to know if anything else needs to be done or can be done, so lets not count chickens until hatched, but while in there go ahead and loosen the GM turbo mount bolts even if you aren't ready for a swap just yet, it's good preventative maint anyway.
     
  15. RCpullerdude

    RCpullerdude New Member

    229
    0
    Jun 8, 2008
    Are there little donought gasket type thingies in the X-over, or is it all flange sealed? That's someting else to think about.
     
  16. Deere Freek

    Deere Freek Recruit

    333
    0
    May 5, 2008
    Hastings, MI
    Well my xover passes the golf ball test so should i worry about it? Turbo bolts seem like they should come out allrignt. Thankfully the truck has only seen 1 michigan winter as far as i know so there is minimal rust.
     
  17. iamdave0887

    iamdave0887 Here Comes Chaos.....

    1,657
    0
    May 5, 2008
    CT
    if it passes the golf ball test i wouldn't worry about it so much. since the golf ball passes through from one side to the other it means theres no kinks in the inner wall of the crossover. i didn't do the golf ball test as my stock crossover had a big dent in it so i just replaced it.
     

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