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Go Back   Dodge Cummins Diesel Forum > 2nd Gen. Dodge Cummins 94-98 12V Forums > 94-98 Powertrain
94-98 Powertrain Discussion of components that are directly involved in the power production and all that is needed to get and keep the truck moving . Engine , Transmission Ect...NO ADVERTISING

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Old 09-29-2011, 09:27 AM   #1 (permalink)
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High RPM Engine Chatter

So i've been noticing for a while when driving, anytime i get around 1900-2100 RPM there is a loud chatter coming from the engine. It isn't a rattle, more of a very fast chatter, that is coming from the engine internally. It matches the RPM's (as in it speeds up and slows down as i accelerate and decelerate.) It seems to be worst in 4th gear, and when climbing a grade.

Any ideas?

I have modded the truck slightly, but it did it even before i modded (intake, exhaust, #100 plate, plugged wastegate)

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Old 09-29-2011, 01:19 PM   #2 (permalink)
So the question is???
 
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sounds like a trans issuse if its worse in a certian gear...

How old is the clutch in it??
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97 ECLB Manual...2ndGenDoms trucks EVIL TWIN

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There's a guy floating around here with 780k on his unrebuilt cummins. Now, according to duramax and ford guys, his truck should have fallen completely apart around the engine 7.8 times, since they all know that dodge trucks are junk and only last 100k before they spontaneously disassemble themselves while going down the road. That has happened to me 2.76 times, and both times I was only wearing boxers while driving so it was really embarrassing.
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Old 09-29-2011, 01:32 PM   #3 (permalink)
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definitely sounds like a tranny issue. How many miles on it?
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Old 09-29-2011, 02:29 PM   #4 (permalink)
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138,000 on the truck, and about 3000 on completely rebuilt tranny. the sound doesnt come from underneath though, your can head it much more in front of your face than down low...

It was doing it when i first got it, and the tranny needed work done and it still does it after the work was done. There isnt a vibration or anything associated with it.

It also doesnt make the sound while coasting at that RPM, only accelerating...

I am stumped on it!
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Old 09-29-2011, 02:31 PM   #5 (permalink)
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can you take a video of the noise? maybe try and point us a little closer than just 'from the motor'
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Old 09-29-2011, 02:47 PM   #6 (permalink)
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Maybe check your valve clearance its easy on the 12 or if you haven't done the kdp fix you want to get on that asap
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Old 09-29-2011, 04:25 PM   #7 (permalink)
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9612vinva- I dont know about the clutch, when i had the tranny rebuilt they told me it looked good. So other than that, i have no idea.

I'll try to get a video of the noise here pretty soon... It sounds like it is coming from right behind the radio. I just updated my sig, and i have done the KDP.

Suckindiesel- how do i check valve clearance?
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Old 09-29-2011, 04:25 PM   #8 (permalink)
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9612vinva- I dont know about the clutch, when i had the tranny rebuilt they told me it looked good. So other than that, i have no idea.

I'll try to get a video of the noise here pretty soon... It sounds like it is coming from right behind the radio. I just updated my sig, and i have done the KDP.

Suckindiesel- how do i check valve clearance?
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Old 09-29-2011, 04:56 PM   #9 (permalink)
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Throw search in for valve adjustment or valve clearance I know i've seen a few write ups on the subject
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Old 09-29-2011, 07:06 PM   #10 (permalink)
So the question is???
 
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i still think trans cause accelerating and coasting hit different parts of the gears and put different loads on them...

But keep us updates....
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Quote:
Originally Posted by v8440 View Post
There's a guy floating around here with 780k on his unrebuilt cummins. Now, according to duramax and ford guys, his truck should have fallen completely apart around the engine 7.8 times, since they all know that dodge trucks are junk and only last 100k before they spontaneously disassemble themselves while going down the road. That has happened to me 2.76 times, and both times I was only wearing boxers while driving so it was really embarrassing.
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Old 09-29-2011, 07:53 PM   #11 (permalink)
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B Series Valve Clearance Adjustment

Take care of the KDP right away. A loose pin will make a chattering sound bouncing around on the gears before it finally busts though the side of the case.
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Old 09-29-2011, 10:06 PM   #12 (permalink)
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Well i updated my signature. I have done the KDP.

So i was driving and took a video of it, and kicked it in neutral and revved it up. you can still hear it in neutral with the clutch in or out.

I read up on valves being out of adjustment, and apparently they can cause quite a chatter when out of adjustment...

She runs great, but just makes quite a racket! I took a couple videos too, and you can kind of hear it... is posting a video on Youtube the easiest way to get one on here?
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