transmission chatter

Discussion in 'Heavy Duty Diesel Truck Mechanics Forum' started by HoneyBadger67, Sep 27, 2020.

  1. HoneyBadger67

    HoneyBadger67 Road Train Member

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    '08 KW T660 Cummins ISX CM871 (I figger y'all know this truck by now, but still...LoL)

    Started truck to let (4) brand new batteries charge today and went inside to watch television. Running at high idle, I knew it would get warm, so I turned the engine fan on and just let the engine run for a couple hours.

    Went back outside to shut truck off and all I hear is a lot of clattering. Shut off fan and that didn't help any, so it's not the fan... Step on clutch and not much happens but when I engage the clutch brake all the clattering stops. Let clutch back out and noise resumes. Walk around and listen with hood open and it *sounds* like a lot of the noise is in the (recently replaced) head. Again, engaging the clutch brake quiets the racket.

    It's the same EF tranny that doesn't like going into 4th, 10th or 11th and recent LOF service showed glitter on the trans magnetic plug. Trans has been on list of things to do, so it isn't catching me unawares.

    My question is: do you think the clattering is transmission or valve train?

    Let me know if more information is needed
     
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  3. Roberts450

    Roberts450 Road Train Member

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    Since it stops when the input shaft stops its going to be in the trans. That narrows it down to the input shaft bearing or bearings on the counter shafts as they are the only things turning when the trans is in neutral and clutch released.
     
  4. AModelCat

    AModelCat Road Train Member

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    I'm going to 2nd transmission as well.

    Was it just "fur" on the magnet? That's normal. Chunkies are not.

    Wonder if you have a snap ring in the mainshaft that let loose? That could explain the difficulty going into gears.
     
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  5. HoneyBadger67

    HoneyBadger67 Road Train Member

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    Just fur for the time being. Bearing and seal is a plausible assumption, I think, as the flywheel housing has what resembles diarrhea pooled in it (that's new). Snap ring or sync also sounds about right. Have been babying those 3 gears for a while now. (Skipping 4th completely and trying to skip 10th when possible)
     
  6. AModelCat

    AModelCat Road Train Member

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    Transmission oil is leaking into the bellhousing? Most Eaton transmissions use a wind-back seal on the input shaft, rather than a lip-type seal. If that's leaking, very plausible the input shaft bearing is going out.
     
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  7. HoneyBadger67

    HoneyBadger67 Road Train Member

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    Im just hoping it holds together long enough to get from Tifton, GA to Columbus, NE. Will probably bounce rather than risk putting it under a load.
     
  8. HoneyBadger67

    HoneyBadger67 Road Train Member

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    Can someone help decipher this tag? I know it's a "low inertia overdrive" , that it has an 1850 torque rating and 13 gears. What does the 9 represent and does the long number on the bottom mean anything? Lastly, would I benefit from having 5 more gears (just to get heavier loads moving)? If I'm changing boxes I might as do right by the engine....

    20200928_135201.jpg
     
  9. Roberts450

    Roberts450 Road Train Member

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    I run around the northwest at 105 gross and have 3.58’s with 11/22.5’s and almost never split the bottom side except 4th unless Im starting off on a very steep hill then I’ll split them all. Some times I do use the OD side of the splitter when bobtail on the low side just so I get a little more road speed per shift. But I do believe the only difference from a 13 to an 18 is the shift know interlock itself and not the trans.
     
  10. HoneyBadger67

    HoneyBadger67 Road Train Member

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    I've driven an 18 before and, while I rarely split the low side, it was nice being able to maintain momentum on those heavy uphill starts.
     
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