Sounded like rod knock and then went away

[Stroked777]

A few weeks ago my truck developed what sounded like rod knock with an underlying belt chirp sound. I figured **** it I don't have the money to rebuild right now so I kept driving it despite the fact it was making a terrible sound. Fast forward a few days 4-5 days, and the sound disappeared completely and now the truck sounds normal if not quieter than before. Any ideas where I can start to look? The sound increases and decreased in repetition with the Rpms. I'm a little baffled. Didn't change anything, just added a little more oil one morning but that was the day after the sound started

 

[sootie]

belt tensioner possibly

 

[Stroked777]

That's what I was thinking too. I did crawl under there to see if I could pin point the sound but couldn't. I replaced all the tensioners and belts when I did my studs at 75k and in at 113k now. Could they have gone bad already?

 

[Sideswipe505]

Yeah those tensioners are kinda hinky... mine have 5k miles on them and already give a small chirp on startup sometimes.

 

[Stroked777]

Mine didn't make the sound on start up. It was constant

 

[Sideswipe505]

Still possible that it could be a tensioner. I'm sure someone with more knowledge will chime in.

 

[Stroked777]

I plan on taking a look at it. I'm pretty sure it's not rod knock, I take very good care of the truck and it's only got 113k

 

[Six_Sloww]

Mine does it every time I start it, let me try and dig up a video see if it's the same sound you're hearing.

 

[Six_Sloww]

http://youtu.be/crr_q60Bg08

Sound like that?

Mine makes that sound during snappy throttle and every time I start it up, after a minute or so it goes away and I don't notice it any more. I've learned to ignore it and it hasn't gotten any better or worse.

 

[Stroked777]

Mine doesn't sound at all like that. Mines got a chirp to it

It started making the noise this morning half way to work and definitely has a more pronounced chirp sound to it this time

 

[Powerstroke Man 6.4]

http://youtu.be/crr_q60Bg08

Sound like that?

Mine makes that sound during snappy throttle and every time I start it up, after a minute or so it goes away and I don't notice it any more. I've learned to ignore it and it hasn't gotten any better or worse.

not to derail the thread but is it possible to find out what that sound is? My 2 6.4's make the same exact noise when reved up like that.

 

[Six_Sloww]

Mine doesn't sound at all like that. Mines got a chirp to it

It started making the noise this morning half way to work and definitely has a more pronounced chirp sound to it this time

That's good, it's not a confidence inspiring sound

not to derail the thread but is it possible to find out what that sound is? My 2 6.4's make the same exact noise when reved up like that.

I can't figure it out.. There's videos on YouTube that sound like it, some people have taken them in to ford and they were told it was normal, others have told me possibly rocker arms.. but I think it sounds too rhythmic to be rockers, but mine probably do need to be changed, 257k on mine.

 

[Powerstroke Man 6.4]

That's good, it's not a confidence inspiring sound




I can't figure it out.. There's videos on YouTube that sound like it, some people have taken them in to ford and they were told it was normal, others have told me possibly rocker arms.. but I think it sounds too rhythmic to be rockers, but mine probably do need to be changed, 257k on mine.

Ah I got 260K on mine. I just cant figure it out either drives me nuts sometimes LOL.

 

[Stroked777]

Change your rockers. I got mine from sunrise for under 400 for both sides. Mine where shot when I had my heads off at 75k and I replaced them 20k miles later

 

[Six_Sloww]

Change your rockers. I got mine from sunrise for under 400 for both sides. Mine where shot when I had my heads off at 75k and I replaced them 20k miles later

For the whole rocker assembly on both sides?

 

[Stroked777]

For both sides it was under 400 plus you need 8 injector seal and line kits

 

[Six_Sloww]

Thank you, derail over.

 

[Stroked777]

sounds getting worse, ill be replacing the bad tensioner when I found out what one, before my trip to wyoming

 

[Stroked777]

Is there anyway to lube the tensioner that's making the noise? It's the main drive one and I don't see any rust coming out of it or any signs of wear on the outside. It does jump up and down about 1/8 to a 1/4 of an inch while the engine is running. And the pully isn't wobbling around. The AC tensioner is smooth and doesn't move, I take that it's that way due to the shorter belt length. Any idea guys?

 

[boggerr]

Do you still have the knocking noise or is it just a chirp? I went nuts with a chirping noise on mine and it turned out to be a broken exhaust manifold bolt.