Knocking sound from my engine

[BIRDMAN]

It started Saturday or so. Not terribly loud, but noticeable and definitely different. When I started my truck, first of all it turned over a little longer than usual, and kind of sputtered on. It was very warm Saturday so I figured my truck was doing what I did when I walked outside, and said "woah, it's warm!". After that, I noticed a knocking sound from the lower portion of the engine. I can hear it best when I listen from under the driver's side wheel well or by crawling under the truck. No leaks, no engine lights...


Sounds like someone lightly knocking on a wooden table and it gets louder and faster with higher RPMs. Probably going to the dealer tomorrow to let them have a listen. I'm sure they will tell me it's "normal", but I just want to to be on record before my warranty expires. Anyone have a similar problem? Thoughts?

2013 SuperCab 6.2, 29,*** miles. Running 5w-20 synthetic and have been since the first oil change.

 

[SaintsFan]

Bad gas maybe?

 

[Ruger]

Birdman, it is very difficult to detect the true source of a specific noise in the engine compartment with the unaided human ear. You might make the modest investment in a mechanic's stethoscope to accurately zero in on the source. What you describe could be a sticky or stuck valve lifter if the sound comes from the top of the engine. If you buy a stethoscope, be sure to listen carefully along the length of BOTH valve covers.

 

[Hole Shot]

They call that the little man trying to escape from the block. Meaning a rod wants to depart the crank and venilate the block. How does the oil pressure look. If you have a spun main bearing, oil press will usually drop. If its a rod it may not drop just knock. I would make them at least drop the oil pan and take a look at the crank. Espically if warranty is almost up!! Hope you got all your oil change records!! If they dont want to take a serious look at it tell them you will pay for the gasket and labor to pull the pan before warranty is up.

 

[BIRDMAN]

5.4 > 6.2

---------- Post added at 03:43 PM ---------- Previous post was at 03:42 PM ----------

Not a stuck lifter I know that sound. That's more of a less frequent tapping sound. This is a lower, deeper knocking sound. If I hold the RPMs in 1st gear around 2500 it's pretty loud inside the cab.

 

[Ruger]

Suggest you get a mechanic's stethoscope (or a length of rubber tubing) and poke around. Make sure it isn't the water pump or the PS pump.

 

[Raptizzle]

You check the ORM button?

 

[Hole Shot]

if its any pump its the oil pump water and ps pumps dont knock

 

[FullAuto]

Sounds like what my brother's TBSS did when he "damaged" his bearing. It didn't spin and drove fine but we could hear it. A chunk of the bearing broke off. He tore his motor apart and everyone at his shop was shocked we drove it home 300 miles like that.
I would drain your oil and strain it with a coffee filter. You will know real quick if you have an issue. Or better yet let the dealer do it.

 

[Rickoo]

Thought I saw a new white one on Herb Chamber's lot a week or so ago. If all else fails, you could start with a new, fresh one!

I've never been to the marathon. Have watched it many times on tv. Never wanted to brave the crowds. My wife and I were thinking this may be a great year to see it in person. If I make it, I'll watch for you!

Best of luck and stay away from the crazy guy all over the news today!