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  1. #1
    Elite Member
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    Mar 2006
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    3,059
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    Wisconsin
    Tractor
    2003 NH TN70A

    Default Bent exhaust pipe!

    I have a horizontal exhaust pipe on my New Holland TN70A. I was backing up and it got caught on a piece of wood and bent the pipe and perforated shield on the pipe. So, any ideas on how to fix this thing? The replacement pipe costs 111 dollars. The tractor runs fine (maybe a bit quieter???) How much harm does this exhaust pipe restriction do to my turbocharged 3 cylinder diesel? The only reason I found that it was bent was doing my usual walk around inspection while I was taking a break. I had no idea it was bent.

    Bob

    DSC01198.JPG

    DSC01200.JPG

  2. #2
    Elite Member
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    Oct 2000
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    3,044
    Location
    Windham County, Conn
    Tractor
    Ford 2120 , New Holland TN75D, Hitachi UH083LC Excavator

    Default Re: Bent exhaust pipe!

    Bob

    If I can see right that bend looks tiny. I wouldn't worry about it. If you have a significient flow restriction it will cut down on turbocharger boost.

    Could you give us a better idea as to what % you think the pipe is blocked.

    Andy

  3. #3
    Elite Member
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    Mar 2006
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    3,059
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    Wisconsin
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    2003 NH TN70A

    Default Re: Bent exhaust pipe!

    Quote Originally Posted by AndyMA
    Bob

    Could you give us a better idea as to what % you think the pipe is blocked.

    Andy
    I will look again in the am, my first guess is 40%.
    Bob

  4. #4
    Elite Member
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    Mar 2006
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    3,059
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    Wisconsin
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    2003 NH TN70A

    Default Re: Bent exhaust pipe!

    Quote Originally Posted by AndyMA
    Bob Could you give us a better idea as to what % you think the pipe is blocked.

    Andy
    Here is a picture of the bend in the exhaust pipe. Looks ugly to me, what do you think?

    DSC01202.JPG

  5. #5
    Silver Member
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    Oct 2006
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    130

    Default Re: Bent exhaust pipe!

    maybe cut it off with a sawsall, and get a piece from a local muffler shop and weld it on, or replace the whole thing. Exhaust pipe is not too expensive. Once it's bent like that, it's not worth trying to straighten it, imho. My shop has pieces laying around that would be fine for that, and would be freebees to a regular customer that we liked or a couple of bucks to a walk in person.

  6. #6
    Platinum Member Tom_Veatch's Avatar
    Join Date
    Oct 2003
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    516
    Location
    Wichita, Kansas
    Tractor
    Yanmar 2220D

    Default Re: Bent exhaust pipe!

    IMHO, needs fixin'. From the picture, it looks like way too much restriction in the exhaust flow - read "back pressure", burnt valves, etc.

    Hmmm...wonder how pieces of scrap EMT conduit would work in that application...
    Tom Veatch
    Wichita, KS
    USA

  7. #7
    Gold Member
    Join Date
    Jun 2006
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    320
    Location
    South of Seattle
    Tractor
    Dad's=JD4440;IH1066;JD4020;JD3010;2 JD"B" 1949 & 1937(hand-crank)

    Default Re: Bent exhaust pipe!

    I agree that it needs a repair done to improve flow. My suggestions are: cut off 90 degree bend (damaged) about 2 inches on each side from that bend. Measure inside and outside diameters as best you can. Go to the local car parts place and pick up a 90 degree sweep that fits your pipe(preferably the 90 degree sweep would fit over your existing pipe). Now, IF you can weld, then weld it. If you can't weld; then purchase flat exhaust-style band clamps that wrap around that diameter of pipe and turn its "clamp" to an area that would miss the heat shield and tighten. These types of band clamps are used on semi-trucks exhaust everywhere(usually 5 inch diameter), but I have purchased small ones for use on my Chevy 454 dually also (they were found at a high quality exhaust shop). I'm sure a good parts store could order them for you. I mention band clamps, because they shouldn't interfere with that heat shield like a U-bolt style clamp might. Just a thought or two. Note: Once you get the new 90 degree sweep home, you may have cut one or both of your pipes a little more to get the proper fit.

  8. #8
    Super Member JerryG's Avatar
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    Apr 2000
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    7,171
    Location
    Northwest Arkansas
    Tractor
    MF 1440-4 PowerShuttle

    Default Re: Bent exhaust pipe!

    That's not good especially with a turbo engine. Take it off and then to a muffler shop. It will be quick easy fix.

  9. #9
    Super Member
    Join Date
    Oct 2003
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    7,344
    Location
    Northeast, Ohio
    Tractor
    TC-40D SS New Holland

    Default Re: Bent exhaust pipe!

    Bob cut it off just before the 90 degree bend and take the piece with you to a local muffler shop. I would weld the new piece in place so you need not deal with a muffler clamp at that point. I'm sure you can straighten the shield with a hammer.

    Then my advice would be to stay away from those tree stumps.


  10. #10
    Elite Member AlanB's Avatar
    Join Date
    Jan 2004
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    2,531
    Location
    Clarksville, TN, USA
    Tractor
    NH 1925

    Default Re: Bent exhaust pipe!

    I am in the muffler shop crowd as well.

    I would be suprised if it was over $30, and it would be perfect.

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