ISX crank play

Discussion in 'Heavy Duty Diesel Truck Mechanics Forum' started by squeaky3, Mar 16, 2023.

  1. squeaky3

    squeaky3 Bobtail Member

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    Jun 15, 2022
    0
    I have a Kenworth T680, just put a clutch and suitcase kit in. Left the shop and driver came back next day with a rattle/ bearing noise coming from bellhousing area. Would only do it if you let off the clutch quick and would go away with the clutch depressed. Thought it was the input bearing got damaged so pulled it all apart and could not find any damage to bearing, input shaft, pulled top cover of trans, no issues seen. Pulled bellhousing off trans, countershaft bearings look ok. Dropped clutch and flywheel, no issues. Checked crank play and found it has a good bit of play, spec is 0.004"- 0.020". Waiting on my dial indicator to show up tomorrow to see exact amount but it was more than that. Pulled pan and #4 main bearing and thrust bearings, they have some wear but not excessive. Cant see anywhere that the crank is broken, whole thing moves back and forth when prying it. Any ideas what else to check other than dropping rest of main caps out?
     
    Last edited: Mar 16, 2023
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  3. God prefers Diesels

    God prefers Diesels Road Train Member

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    Jun 26, 2020
    South Texas
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    Quickserve might have the specs, but this sounds like the clutch to me. If you let off quick, made it rattle, then got under the truck and looked, are the forks still touching the throw out bearing?

    Genuine parts or aftermarket?

    Mine used to rattle with pedal in, so I put a new clutch and installation kit in. Old clutch looked perfectly fine, throw out bearing felt fine, but the new clutch fixed the rattle.
     
    Rideandrepair and BoxCarKidd Thank this.
  4. squeaky3

    squeaky3 Bobtail Member

    18
    4
    Jun 15, 2022
    0
    Clutch and input kit were all new eaton parts. Putting a new install kit in again since we have it all apart. Spec of end play is 0.004-0.020" it definitely has more play than that. Waiting on new thrust washers to come in hopefully to day and my dial indicator to show up today to actually measure end play after the new washers get put in.
     
    Rideandrepair Thanks this.
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