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Old 03-13-2010, 07:08 AM
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exhaust drone/noise

I got an 04' 6.0L with a 4" MBRP exhaust. I have a drone/noise in the exhaust, seems like around the turbo area at exactly 1100RPM +/-. It will do it while driving and in neutral in the driveway. I have done a little research and it seems that it could be a couple of things.
-exhaust alignment (downpipe between CAT and turbo)
-turbo pedestal (A-brace needed) or new pedestal
-y-pipe alignment

Note the truck has 110,000 on it and had never had any noise up until I just recently deleted my EGR cooler. Which makes sense because I removed all my y-pipe connections etc.

What do you guys think?
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Old 03-13-2010, 07:28 AM
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Try this! read the thrid sentence and on.


6.0 Moan/Droan Between 1500-2000 RPM:

Engineering has investigated this condition and found the cause to be engine firing pulses causing the turbo mounts to vibrate/resonate. There is a revised turbo pedestal for trucks built before 9-30-03--P/N 3C3Z-6N639-BA. Ensure the droan is not caused by a bound exhaust system. Inspect for any damaged or broken exhaust hangers. Check the turbo downpipe by loosening the pipe at the top and bottom, checking its alignment and retightening. If the droan is still present, check the part number embossed on the turbo pedestal just below the turbo compressor outlet to the intercooler. If the number IS NOT 1846207C1, replace the pedestal with the above part. After replacement, or if the number IS 1846207C1, loosen the turbo inlet pipes and EGR cooler flange and neutralize by installing the components in this order: snug the flange between the LH and RH inlet pipes; torque the EGR cooler clamp to 53 in/lbs; torque the pedestal bolts to 23 ft/lbs; torque the turbo inlet clamp to 9 ft/lbs: snug the inlet pipes to manifolds. Ensure all components are properly aligned. Torque the flange between the LH and RH inlet pipes to 20 ft/lbs and the inlet pies to the manifolds to 20 ft/lbs. Broadcast Message 0992, SSM 17530, TSB #04-9-4.
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Old 03-13-2010, 08:03 AM
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thanks!!!!!!! As it gets warmer out I will give this stuff a looksie.

Question, can I do any damage by leaving the drone as is? Does it hurt anything? Regardless i will do all of the above but just wondering if I should get on this sooner then later
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Old 03-14-2010, 04:11 PM
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I am new to this site and I have a question. I put a egr cooler from buelit proof diesel and new gaskets and oil cooler up drain pipe to turobo and I put it back together and now it is robie of power and it sounds like the turbo is leaking it is makeing a wining nosie. I need help bad I miss my truck. I have tryed to lossen the turbo and retined the clamps and tieden the bolts to turbo and even put a new clamp on the y pipe to turbo. That is the only two surfaces that dont line up and it is not much.
Thank Anthony
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