1lowranger

Then why are you commenting in this thread?

oldwrench

Years back when I was wrenching, I found that rods and wrist pins will knock as the rpm's increase under load. Then, after reving, if it knocks as the engine is coming back down to idle, it is the crank bearings and thrust bearing. So, going up is rod/piston and going down is crank. Just at idle, I would find out which main bearing is the thrust bearing. The crank could be thumping forward and back. Is it a problem? It might just be a noisy block design once it wears in a bit. Aluminum is much louder than cast iron is.

la_leo

I've posted numerous times about my 5.0 knock and included a video. I understand the difference of injectors doing their job and something mechanically wrong.listen to my truck.right at the end the knock is clearest on the passenger side fender well. You can hear it in person better from inside of the cab even. I did get a chance to listen to a couple of other people's 5.0s and they are quiet and knock free.mine is at the dealership as I type being diagnosed.even the techs said it isn't normal.it helps that I have a little mechanic knowledge I guess so I knew right away my knock wasn't normal. .

Red13

Check your exhaust pipes and mufflers. They might have some damage. Just thinking out loud.

la_leo

Yours sounds normal. Maybe a slight ticking but no knock. There is a tsb out there about the timing chain guides that mentions a scratching noise.Maybe that's what your hearing but I don't hear a knock.but to those who have a knock...I think the more we get people on the boards and forums with this issue the more Ford can't deny they haven't heard of it.every customer service rep I've talked to has denied any knowledge of bad blocks or timing chain problems or knocks.kind of hard to believe when all you have to do is Google it

hetman

Suggestion: get a mechanic stethoscope from any auto parts store or harbors freight, $5-$25, or a metal rod that will transmit sound (long screwdriver) and really listen to top & bottom of engine & you probably could record it also

oldwrench

A length of 5/8 hose will act like a directional mic if the noise is not a metallic one too.

5.0GN tow

If it's knocking that loud and has been for a while, next oil change get a UOA and see how much metal is in the oil, I would guess there would Be a fair amount. Maybe not but seems to me it would be causing irregular wear.

cthusker

Might be perfectly normal but it sure does knock/tick. Not sure I'd like to hear that all the time........

TAPDC

Mine does it intermittently, doesn't make me feel very confident about the long term reliability of the motor.Hope I am wrong.