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  #1  
Old 11-28-2010, 09:51 PM
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Default Newbie Cummins owner with problem

Hey folks, need some of your expertise.

I picked up my new to me, 3500 DRW with 5.9l Cummins Turbo. Over the last month, I've driven the truck only a handful of times, with now problems.

However, over the weekend, I pulled my travel trailer home and had an issue. Basically, when I would be cruising at highway speeds with no incline, no issues, but whenever I hit a hill of any sorts, it seemed like the turbo kicked out and when it did, it made a weird, almost sucking sound at the same time. The engine immediately lost power, but then regained it as fast as it lost it. No smoke from the exhaust and turbo spooled right back up.

Now, I know that the clutch need replacing, as it was slipping a bit, under a heavy load, in between 3rd and 4th gears.

Is it possible for the clutch to be slipping that much during a inclined acceleration? Or might it lie in the turbo system?

I'm getting ready for a cross-country trip next month, so want to get this fixed as soon as possible.
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Old 11-28-2010, 09:58 PM
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Oh, I'd about guarantee it's turbo related. Sounds like a wastegate issue.
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Old 11-28-2010, 10:05 PM
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As I'm new to the turbo engine, is this something easily checked? I'm going to have one of my mechanic friends take a look at it, but is there something that I could trouble shoot in the mean time?
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Old 11-28-2010, 10:14 PM
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just found this on Google

Depends on where the problem is. If the problem is the wastegate acutuator (gold or rusty cylinder attached to the turbo), replace it. If the problem is the wastegate flapper assembly (arm attached to turbine housing on the turbo), pentrating oil works wonders. If that does not work, you have to replace the turbine housing.



Read more: http://wiki.answers.com/Q/How_do_you...#ixzz16dLTCZhm
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Old 11-28-2010, 10:21 PM
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I agree, sounds like an issue with the turbo system, if the clutch was slipping, then you'd be spiking the RPMs.
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Old 11-28-2010, 10:27 PM
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Yeah, guess you're right on the clutch slippage causes increased RPM's. Glad I'm not a mechanic

Will driving it like this hurt the engine/turbo in any way? I didn't plan on it, but I'll have to drive it up to my buddies house.
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Old 11-29-2010, 12:26 AM
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Old 12-07-2010, 11:37 PM
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Thanks for all the advice, folks. After a bit of research and talking with a bunch of my mechanic friends, I'm comfortable saying that what I've been experiencing is compressor surge. As a new driver to turbo diesels, what I believe that I'm doing is letting off the throttle a little too fast, not allowing the boost that has built up to do anything, but surge back out the intake.

I'll certainly keep an ear out, as I'm fixing to hit the road in about 2 weeks, trailering my '08 Ram up to Michigan before my big move. I'll be hauling about the same amount of weight, so I'll pay better attention to my right foot when the boost is built up.

I have since replaced the clutch. That fixed the slipping problems that I had. OH MY GOD, was that a chore. Took me and a friend about 8 hours to complete, but happy that I took the time to do it. Both the pilot bearing and the throw out bearings were shot!

Any other thoughts on how to curtail the compressor surge? My engine is mostly stock, vice the AEM Brute Force CAI and what I think is a 5" MBRP exhaust. I'll be installing a boost gauge over the weekend, to see what is actually going on with the turbo.

Thanks again for the advice. If it does keep doing this, does anyone know where I can get a stock waste-gate? Seems that Holset or Cummings does not sell the thing without a brand new turbo attached to it. The only other one the I see that I can purchase is the Banks actuator for like $200. I don't need anything like that, though.
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