Mack granite exhaust fumes in cab.

Discussion in 'Heavy Duty Diesel Truck Mechanics Forum' started by B77, Jan 27, 2022.

  1. B77

    B77 Light Load Member

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    Dec 16, 2010
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    The whole exhaust system is double checked. No leaks. Seams to be coming from the heating vents. But can be wrong. Any ideas? Tia
     
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  3. 201

    201 Road Train Member

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    Apr 16, 2014
    high plains colorado
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    Ahh, smells like money to me,,,seriously, if all the clamps are tight, the only other place would be the manifold gasket. If it's that bad, you should see soot where it's leaking.
     
  4. flood

    flood Road Train Member

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    Dec 25, 2010
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    Flex pipe between the turbo and the one box.... it tends to burn out the pipe on the top back side... almost impossible to see even with a flashlight... unless your under the truck looking up at the side facing the engine
     
  5. Hayfieldmn

    Hayfieldmn Light Load Member

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    Sep 10, 2016
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    Had same problem on my 389, replaced the flex pipe and solved problem. Easy job to do.
     
  6. B77

    B77 Light Load Member

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    71
    Dec 16, 2010
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    The flex pipe got changed 3 weeks ago. Nowhere spot marks to see. I am driving right now with ventilator off. I think it’s coming through there. There is still air going thru the vents. Last day I drive it. The fumes are killing me
     
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