2012, 6.7 Liter Dodge RAM 3500, Engine Noise - Dodge Diesel - Diesel Truck Resource Forums

4th Gen Engine and Drivetrain-2010 and Up 6.7 liter Engine and Drivetrain discussion only. PLEASE, NO HIGH PERFORMANCE DISCUSSION!

2012, 6.7 Liter Dodge RAM 3500, Engine Noise

Reply

 
 
 
Old 09-08-2018, 02:51 PM
  #1  
Registered User
Thread Starter
 
Join Date: Jan 2009
Posts: 6
Thanks: 0
Thanked 0 Times in 0 Posts
2012, 6.7 Liter Dodge RAM 3500, Engine Noise

Hi Folks

This is a beautiful, Single Rear Tires, truck with 113k on it. This morning, it started a weird, periodic TAP, TAP, TAP, TAP, TAP, then 1 second of silence, then the TAP repeated. It is NOT a drivetrain issue and it's rapidly getting worse. At first it only did it under load. Now it does it idling. Enclosed, is an audio file of the sound with the hood up, standing near the motor on the driver, then passenger side. The gage is showing 32 PSI oil pressure at idle. What do you think?

Thanks!
Attached Files
File Type: wav
2012DedgeEngineKnockTap.wav (2.09 MB, 60 views)
ecnels is offline  
Reply With Quote
Old 09-08-2018, 07:55 PM
  #2  
Winner winner chicken dinner!
 
RyeThomas's Avatar
 
Join Date: Aug 2006
Location: Northern VA
Posts: 1,596
Thanked 7 Times in 7 Posts
I’d pull the valve cover and see if your valve train is good, sounds Iike a valve or valve spring retainer let loose or valve seat and is making contact with the piston.
RyeThomas is offline  
Reply With Quote
Old 09-10-2018, 02:42 AM
  #3  
Cummins Guru
 
BigIron70's Avatar
 
Join Date: Feb 2008
Location: Sunny Southern California Land of Fruits and Nuts
Posts: 4,189
Thanked 54 Times in 36 Posts
Check for broken valve spring,
BigIron70 is offline  
Reply With Quote
Old 09-14-2018, 04:10 PM
  #4  
Registered User
Thread Starter
 
Join Date: Jan 2009
Posts: 6
Thanks: 0
Thanked 0 Times in 0 Posts
Thanks for the advice. I had to go out of town . . . now checking. I pulled the valve cover. I don't see anything obvious with the springs or rockers. There is a code for a #2 cylinder miss. It's interesting that the engine went from a "rolling, cyclical knock: (Several quick knocks, followed by a period of silence, followed by the knocks again) to constant knocking & squealing at idle. I'm beginning to think Valve Seat. Any further thoughts on your part? My next thought is to pull the injectors and place a video scope in the holes and check for piston contact with a valve. Does that make sense to you?
ecnels is offline  
Reply With Quote
Old 09-14-2018, 05:10 PM
  #5  
Winner winner chicken dinner!
 
RyeThomas's Avatar
 
Join Date: Aug 2006
Location: Northern VA
Posts: 1,596
Thanked 7 Times in 7 Posts
That would be my next move, best of luck.
RyeThomas is offline  
Reply With Quote
Old 09-18-2018, 04:36 PM
  #6  
Registered User
Thread Starter
 
Join Date: Jan 2009
Posts: 6
Thanks: 0
Thanked 0 Times in 0 Posts
2012 Dodge 6.7 Liter Serious Noise

I pulled the head off. There's nothing obvious with the valves or the pistons; especially, for a noise of that magnitude

All pulleys, including the A/C have been checked and cleanly spin. The serpentine belt looks decent - not burnt.

The Turbocharger spins freely.

The sound started out as a "rolling tap". Tap-Tap-Tap, followed by a couple of seconds of no noise, the Tap-Tap-Tap. . . repeat, but within a day, even at idle, the noise became continuous, squeaky sounding (possibly like metal to metal slippage). It sounded scary, like something was about to break or lock up.

If it is a loose valve seat, I can't tell it with the naked eye. Tapping the valves with a hammer - They all act about the same. There's nothing sticking; though perhaps, a loose seat won't necessarily show physically right away??

Anyway, regardless if any of this rings any diagnosis bells for you, I'd love to hear your opinion!

BTW, I don't intend to go back with the same head or injectors. What would you recommend?

Last edited by ecnels; 09-18-2018 at 04:43 PM. Reason: Added Pics
ecnels is offline  
Reply With Quote
Old 09-19-2018, 08:38 PM
  #7  
Registered User
Thread Starter
 
Join Date: Jan 2009
Posts: 6
Thanks: 0
Thanked 0 Times in 0 Posts
Found Metal Flakes in Oil Filter

I drained the oil through a cloth and found one small metal flake, then I pulled the oil filter, cut the "can" off of it and removed the pleating: SURPRISE!! See Pics

The other surprise was that when I removed the oil filter from the engine, it was only about 1/2 full of oil. I've never had a filter be less than full when removed for an oil change. The oil level in the truck was full before draining the pan - I check it every fill-up.

This serious-knocking happened suddenly - over the course of 3 running hours it grew from a small cycling Tap-Tap-Tap-Delay a couple of seconds, Repeat, to a steady knock - increasingly louder until it became ominous.








ecnels is offline  
Reply With Quote
Old 09-20-2018, 06:50 AM
  #8  
Winner winner chicken dinner!
 
RyeThomas's Avatar
 
Join Date: Aug 2006
Location: Northern VA
Posts: 1,596
Thanked 7 Times in 7 Posts
Time to find a good machine shop and tear into her. Sorry buddy that just plain stinks.
RyeThomas is offline  
Reply With Quote
Old 09-20-2018, 11:41 AM
  #9  
Registered User
Thread Starter
 
Join Date: Jan 2009
Posts: 6
Thanks: 0
Thanked 0 Times in 0 Posts
Yeah I'm about to do it. One clue, I've changed maybe a couple of hundred oil filters in my life and every one has been tip-top full when removed. This one was half full. I'm trying to figure out how that could be, because something would have to create a vacuum, scavenging effect to be able to pull the oil from the top of a vertical filter can.
ecnels is offline  
Reply With Quote
Old 09-30-2018, 04:29 AM
  #10  
Winner winner chicken dinner!
 
RyeThomas's Avatar
 
Join Date: Aug 2006
Location: Northern VA
Posts: 1,596
Thanked 7 Times in 7 Posts
Any update?
RyeThomas is offline  
Reply With Quote
 
 
 
Related Topics
Thread
Thread Starter
Forum
Replies
Last Post
JeffIvie
4th Gen Engine and Drivetrain-2010 and Up
3
12-26-2013 06:33 PM
Diesel Deere
4th Gen Ram -Non Drivetrain- 2010 and Up
0
10-26-2011 08:06 AM
kawi700
3rd Gen Engine and Drivetrain -> 2003-2007
11
03-25-2011 12:07 PM
kawi700
Introductions / New People
5
03-23-2011 08:03 PM
eightball
General Diesel Discussion
17
10-11-2010 02:28 PM


Thread Tools
Search this Thread
Quick Reply: 2012, 6.7 Liter Dodge RAM 3500, Engine Noise


Contact Us Archive Advertising Cookie Policy Privacy Statement Terms of Service

We are a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for us to earn fees by linking to Amazon.com and affiliated sites.