Engine slips-mechanic confused

Discussion in 'International Forum' started by Fools_Vortex, May 18, 2021.

  1. Fools_Vortex

    Fools_Vortex Bobtail Member

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    May 17, 2021
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    Hello folks. I hope I'm doing this right..here goes. I'm having an issue with one of our company trucks (06 Int 8600). As I accelarate, from 1200-1700ish, the truck acts like the tranny slipping. Loaded or unloaded affects the severity, but not the frequency. New tranny last year, new turbo 3 years ago. I'm admittedly hard on it (I blame it on the nature of what I have to do, set septic tanks) but I've asked the mechanic if it's my driving and he says he doesn't think so. This has been going on for a few years, so if it was the tranny or turbo, the new one's should've fixed it right? I can add that a couple times while accelerating, my truck went beyond "slipping" and the bootom fell straight out. Happened with cruise and peddal both. Turbo chirped hard a couple times as it pegged and dropped and struggled to climb back up the RPM's. I read in a KW forum about a guy having same issues, and it wound up being the clutch. But that was auto trans, mine's a 10 speed. Could it be the clutch? Turbo pressure tests all pass. I did mange this trick, don't know if it helps: when it was below 30, if I parked outside with the nose close to the shop door and would start it, it will register an engine code and the problem goes away. If I turned it off and started it again, code goes away and problem comes back. The engine code did not lead the computer to the problem. Another funny detail, I just got it back from mechanics for oil service and to investigate this issue again, but they said they couldn't find the problem again. The thing makes it funny is, it is NOTICABLY better. They didn't adjust the clutch or have to add any fluids aside from a bit of oil, they just hooked it up to the computer, but no code so no repair. This has happened before, with varrying degrees of effect. Would appreciate any information. Thank you.
     
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  3. Don379

    Don379 Medium Load Member

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    Engine does not slip. If you have clutch engaged and foot off clutch, trucks rpm goes up while speed does not, that means that your clutch is slipping. There is absolutely nothing else it can be.
    Does your clutch pedal have free play? If it does not have any free play, I would start with that. Next open your inspection cover and check for large amounts of oil in the hand hole.
    If your mechanic didn’t check those things, than I don’t know what to tell you. What size motor is in there? Maybe the shady mechanic put the wrong clutch in there way underrated for your motor. But of course he won’t fess up to it, becuase that would be on him. Find out the part number clutch he installed.
     
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  4. Fools_Vortex

    Fools_Vortex Bobtail Member

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    May 17, 2021
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    Hey Don, appreciate the advice. I recognize engines don't slip, just super frustrated and that's what I came up with for a title. Arg. I can say it's been a while since the clutch has been adjusted, and almost no free play at this point. Catches halfway out and rides the rest of the way. There is a tiny bit of play. This is my first gig as a driver, and it's the main truck I drive. On this truck, it's never stayed tight after an adjustment for long. A week or so, maybe two, when the other trucks hold it for much longer. I just figured that was the way this truck is. It's just hard to believe it would be the clutch and the mechanics not identifying it as that. Is this really that sneaky of an issue? I mean, after what I read in the KW feed and with your info here, I would belive it, but really?

    As far as engine size, part number, and inspection cover; I will check all of that when it comes back. I broke the outrigger mounts durnig my last set, but as soon as she's back I'll gather that information and act from there. Thank you again for the help. Greatly appreciated.
     
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  5. AModelCat

    AModelCat Road Train Member

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    Gotta be slipping. If that free play at the top of the pedal disappears its likely because the clutch is slipping and being worn down. As the clutch wears you lose free pedal.
     
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  6. Don379

    Don379 Medium Load Member

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    yeah and says always needing adjustment. sounds like mechanic bought wrong clutch for low torque motor or something
     
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  7. Fools_Vortex

    Fools_Vortex Bobtail Member

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    May 17, 2021
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    Thanks for the info guys. Talked to the boss about the comments here and he talked to the machanics. He doesn't believe our mechanics are shady. Stupid yes, but not shady. That being said, one of the wrenches convinced his boss and mine to go with a clutch adjustment to start. He's willing to put a new one in, I have a good boss. But wants to take the mechanics advice. Any thoughts on if that's a solid step forward? And if so, any suggestions on how long an adjustment should last? I feel like the previous ones lasted, at best, less than a month before the clutch was at the end of the pedal. And that this adjustment is just prolonging the inevitable.
     
  8. Isafarmboy

    Isafarmboy Road Train Member

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    Goin on for a few years?
    Prolly riding the pedal as a bad driving habit.
     
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  9. Don379

    Don379 Medium Load Member

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    I’m a city driver rolling heavy 90 percent of the time. Lots of stop and go driving. I keep free play for many many months. I like at least 2 inches of free play. Maybe once maybe twice i year I adjust my clutch. If you are indeed not riding the clutch, I’m convinced wrong clutch for the rating of your motor and the thing is slipping enough where maybe you don’t feel it even after you adjust your clutch. So that what causing to file itself down and you losing your free play
     
  10. Brettj3876

    Brettj3876 Road Train Member

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    It's not the wrong clutch, you can have a 2250tq engine with a 1450 clutch and if you treat it right it will last. Needs to be adjusted if you don't have free play. About 1.5-2ish inches is what you want.

    What gear do you normally start in?
     
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