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6.5L Diesel Engine Discuss the 6.5 GM diesel engine & associated components. Automatic transmission questions & problems belong in the 4L80/85 - 4L60E - 6L90 Transmission Forum

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Old 07-01-2019, 05:21 PM   #11 (permalink)
Tommygunner
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Do a good inspection of all the gaskets in the exhaust system. Check for leaks when idling.

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Old 07-02-2019, 02:01 PM   #12 (permalink)
kerrye
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I thought perhaps I had excessive turbo play. No in and out but about 1/16” side to side I put a piece of thin paper between a vane and the housing, then grasped the end of the shaft with a pair of pliers and pushed the vanes towards the paper. The bane did not pinch down on the paper so I’m pretty sure the compressor wheel is not contacting the housing.

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Old 07-02-2019, 03:06 PM   #13 (permalink)
Alstrucks
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So was the rattle not there before the transmission overhaul?
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Old 07-02-2019, 03:17 PM   #14 (permalink)
kerrye
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I definitely didn’t notice it before the rebuild. It’s possible I was listening harder after the rebuild and noticed something I had missed before although my wife also noticed it and she’s not a gear head
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Old 07-03-2019, 01:38 AM   #15 (permalink)
EppNation
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Quote:
Originally Posted by kerrye View Post
Usually starts rattling intermittently after driving a mile or two and making a sharp turn. Pretty uniformly it happens and gets slightly louder when braking for a stop.
Power steering pump? Hydroboost? Check the units themselves with that stethoscope you mentioned having. Also check the routing of the hose assemblies make sure they are secured properly. The only thing that should be making contact with the hose assemblies are anchor points.

Hell, maybe your trans cooler tubes may not be fastened correctly. There should be a hanger that hangs down from a stud in engine's oil pan that both trans cooler tubes snap into.

Fan shroud loose or maybe it's tight but in the wrong place and being nipped by fan blade?

If you ARE able to hear it at hot idle, even faintly, I'd just leave it running and poke around with that stethoscope until I found it. A wooden dowel works well held up to your ear too if you need to reach somewhere distant or deep that stethoscope rod wont reach.
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Old 07-03-2019, 01:53 AM   #16 (permalink)
Sirleitet
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Take the drivebelts off and start the engine, does the noise disappear now?
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Old 07-03-2019, 08:22 AM   #17 (permalink)
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I haven’t removed the drive belts yet but I have inspected the pulley and dampener. I put the stethoscope everywhere I could including the power steering pump. I even had it running up on a lift twice with the stethoscope underneath but so far no joy in isolating it.
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Old 07-08-2019, 08:52 AM   #18 (permalink)
kerrye
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Still battling the rattle. Today I drove about 75 miles and it was cool so windows were up and I could listen closely. I discovered a weird but relevant fact: rattle is always there after truck is warmed up but disappears in any slight right turn. Even if I weave in the lane it disappears when I move the wheel to the right but reappears immediately after I center the wheel. Any hypothesis to explain this oddity. It also seems to exhibit this feature when at a standstill.
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Old 07-15-2019, 09:48 PM   #19 (permalink)
kerrye
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Damn rattle still driving me nuts. Stops on a turn to the right or slight motion of steering wheel to right. Not enough of a turn to induce significant centrifugal force. Just moving the wheel slightly off center makes it disappear completely. Definitely associated with engine rpm’s.
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Old 07-15-2019, 10:44 PM   #20 (permalink)
Glagulator
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Could be motor mount bouncing on the frame.

https://www.dieselplace.com/forum/63...ml#post4725838

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