New loud engine noise. Fluid Damper?

[Dieselnerd]

I just got home from an 1800 mile trip towing my fiver.



Two days ago, at a fuel stop, I heard a "heart stopping" OMG I'm still 1000 miles from home engine noise. It was in the front and it was a very loud metallic chirping, sounded like a bad bearing in some accessory. It was not a belt noise, it was metal on metal and sounded bad.



I shut the engine down and inspected and wiggled everything that turns. I saw nothing different. Started the engine again and the noise was gone. It never came back all day.



Yesterday morning, right after I started out, I stopped for a toll ticket and heard the noise again. I pulled into the next service area and opened the hood. Same bad noise, metallic chirping! I shut the engine off and restarted it. Noise gone again, never came back all day and I made it home fine.



Right now I'm wondering if it's a new noise from my fluid damper.



Any other ideas are welcome, has me stumped. Bad bearings don't cure themselves with a shutdown.

 

[AH64ID]

It seems your not the only one.

https://www.turbodieselregister.com...ions-2003-2007/235324-my-fluidamper-saga.html

 

[Dieselnerd]

It seems your not the only one.



https://www.turbodieselregister.com...ions-2003-2007/235324-my-fluidamper-saga.html

No, I'm already on that list and have that noise and still waiting for an answer.



This is a new, totally different noise, but I'm not ruling out the damper.



This noise sounds like something is really bad. I can hear it in the cab and I have bad hearing. It seems to make the noise about twice per belt revolution at idle, not a steady squeal like a bearing but a louder followed by a quieter "chirp".

 

[AH64ID]

Gotcha, no idea then.

 

[JFought]

check clamp (blue plastic) on injection line #4

There known to come loose. if that is it, i would also purchase one from cumings as the noise is vibration that rubs a hole in the line.

 

[Dieselnerd]

JFought, Not the blue clamp, I keep mine tight.



This morning I tried it again and followed the exact procedure that I did two days in a row.



Started truck, turned on defroster, let it idle. After a couple of minutes the noise starts. Engine seemed to be running funny too although it could be run up to 2000 and down again and that seemed smooth enough. Turned defroster on and off in case the A/C clutch wasn't letting go but that made no difference.



If you heard it, you would think something really bad was going on, sounds like a bad squeaky bearing. Then I shut the engine down and started it right up again. The noise is totally gone and won't return until the truck sits overnight.



If I leave the engine running it won't go away at all, even driving for a couple of hundred miles towing like I was doing a couple of days ago. Stop and start and it's gone for the day. Something resets but I have no idea what.



Tomorrow I'll start it without using the defroster and see if it gets the noise again.

 

[JJPage]

Pull the serpentine and freewheel all the accessories, check for any drag, loose or shot bushings/bearings.

 

[Prairie Dog]

While you have the belt off and the eng cool, run it for a minute to see if the noise is still there.

 

[Dieselnerd]

Checked everything with belt off this morning. Everything driven by the belt was good. After that I started up the truck and let it run, with and without defrost. With and without the belt on.



No noise of course. This thing is teasing me.



I'm doing all my after winter travel maintenance today, oil, filter, fuel filter etc.



I'll update if the noise comes back again. Thanks for the ideas...

 

[Dieselnerd]

Found the problem

The noise came back again when I ran the truck after changing the oil. This time I found what's happening.



A while back, I posted that I had a problem after I had the latest style power steering pump installed at my dealer. The serpentine belt was jumping a groove toward the engine and rubbing against the tone ring. I had it fixed by another dealer on the way to AZ last December. They moved the PS pulley forward a small amount and the belt stayed where it belonged. BTW, my local dealer sent me a check to cover what it cost me to have it fixed on the road. Stand up dealer.



Now, once in awhile, when you stop the engine, the belt jumps forward a groove and the belt will rub on the backside of the front flange on the fluid damper causing the squeak. When you shut it down and restart it jumps back where it belongs and the noise is gone.



Looking at my stock damper, it looks like there is a taper behind the flange and the belt couldn't seat itself in another groove that close to the flange and rub on the flange. I'll have to compare the two dampers off the truck. Maybe my fluid damper has too many grooves. I'll do some more checking tomorrow.

 

[JamesStevens]

Glad U found it, I was going to guess the AC clutch, sometimes mine makes terrible noise's

 

[Prairie Dog]

Glad U found it, I was going to guess the AC clutch, sometimes mine makes terrible noise's

Mine engaged so hard last spring that It made me jump. I thought someone had hit me!