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BD Manifold recheck the bolts after driving

Discussion in 'GM Duramax Engines' started by Jasondt2001, May 3, 2008.

  1. Jasondt2001

    Jasondt2001 Lead Slacker

    207
    0
    May 3, 2008
    Salinas, Ca
    Well here's one for you guys...
    I've had the bd manifold on my truck maybe 10k miles. I had the dealer install the thing becuase I was rounding off bolts.
    I've been having a weird tick-tock noise at cold idle, after it warmed up it went away.
    Well I was checking the oil the other day and noticed one of the bolts (the one toward the firewall on the top of the manifold backing itself off, like 1/4" of thread showing. The metal washer was up banging against the bolt/head when cold and would seize itself up I guess when warm...

    I tightened her up and all i well now, no noise, nothing. I'm so proud of myself :smilielol5:

    - Jason
     
  2. Ozzie

    Ozzie Snow looming...run!! Moderator

    2,866
    20
    Feb 10, 2008
    Apple Valley, Minnesota
    Thanks for the heads up on that one...I have the BD manifold and am hoping to have it on next week. Odd how it came loose even after the deal put it in though.
     
  3. MAX4X4

    MAX4X4 Recruit

    54
    0
    May 4, 2008
    CA
    Hhhmmm, I will have to check mine! Thanks!
     
  4. Nor-Cal Nick

    Nor-Cal Nick Suspension Consultant

    540
    1
    May 5, 2008
    Livermore Ca.
    So Jason how where the gains on the BD manifold? I have a plumbing company down the way from me running them and they said that the temp dropped a few deg. on the EGT's.



    Nor-Cal Nick
     
  5. SEA04DMAX

    SEA04DMAX Recruit

    21
    0
    May 5, 2008
    One of those is on my wish list...
     
  6. Jasondt2001

    Jasondt2001 Lead Slacker

    207
    0
    May 3, 2008
    Salinas, Ca
    You know, it spools up quicker and 'feels' like it has a bit more oomph on the seat dyno.
    I wish i would have had an EGT gauge before and after to compare but I didn't :(
     
  7. BudTX

    BudTX Edjumacated Redneck

    Is there a torque spec for that manifold bolt? Just curious.
     
  8. Jasondt2001

    Jasondt2001 Lead Slacker

    207
    0
    May 3, 2008
    Salinas, Ca
    LOL, I'm sure there is - I just don't know it ;)
     
  9. jcool

    jcool #78 A(ACLU) FNG

    1,097
    0
    May 4, 2008
    Richlands, NC
    so all in all the manifold is worth the money?
     
  10. jc64

    jc64 ( . Y . )

    59
    0
    Feb 16, 2008
    Oregon
    The torque specs for the eight manifold bolts is 28ft/lbs. The three bolts on rear flange is 39ft/lbs, the heat shield bolts is around 6ft/lbs or snug, and the bolt on the intermediate shaft is 39ft/lbs.

    BD recomends that you allow the vehicle to go through one or two heat cycles, then re-torqueing the manifold bolts.

    jc
     
  11. dentpusha

    dentpusha LOCKED&LOADED

    881
    0
    May 9, 2008
    a-town texas
    glad to kno im putting mine on soon
     
  12. coldLBZ

    coldLBZ Recruit

    21
    0
    May 9, 2008
    Alberta, Canada
    Mine's going on soon too, thanks for the heads up.
     
  13. Irishtornado

    Irishtornado Diesel Fanatic

    11
    0
    May 9, 2008
    Michigan
    Guess I better retorque mine, but I thought the torque specs where higher than 28lbs. I got my torque specs from the dealer they gave me every torque spec for the duramax engine I guess I need to go look again. For some reason I'm thinking 43lbs.
     

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