2013 4.7 knocking, any help?

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Blackhawk

Blackhawk

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2013
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4.7
I would be checking out your mounting plate if you did not get all the bolts in proper, I am surprised it has not cratered before.
I am thinking Torque converter bolts, but now I reread, you mean transmission bolts ? you flex plate still could be buggered.

If you had the motor pulled down as far as you did , why not just go the rest of the way and pull the heads , and look at the cam. sounds kind of bearing to my old yrs.

I have not had one of these motors in any of my trucks.
Now that I had a coffee, I think you where talking about exhaust bolts.

Just read some more, sorry about the hand, take care, the truck will wait.
I’m going to be pulling the heads soon. I know the cams are okay, it’s a SOHC design.

I hear it more on the drivers side of the engine after using a stethoscope on it more in depth. Loudest from the intake manifold weirdly enough.

I tested it again today by running it and pulling the plugs on the affected bank, noise didn’t change at all. Just ran progressively worse when i pulled the plugs, as expected.

I also took off the exhaust, tick was still there, so I know that’s not the cause of it.
 
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Blackhawk

Blackhawk

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Sounds like a piston slap…..
I’m thinking it might be piston slap. Just makes me wonder why it would be okay the night before, and then when i start it up a few hours after running just fine, it starts to tick like this. I will be pulling the drivers head in a few days to see what’s up.
 
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Blackhawk

Blackhawk

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Update 11/24

Taking the truck in for service on Wednesday to figure this out. I don’t wanna wait longer than i have to with this hand thing, and i would like to know what’s up so i can get it fixed.
 
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Blackhawk

Blackhawk

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Update

Got tuck back from dealer. They pretty much told me that they can’t find the issue and screwed me for 200$. I will be tearing it down again tomorrow.
 

jws123

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The 4.7 is a very simple engine like i said before timing chains and lifters if you want to rule out lifters time consuming but pop the rockers off each cylinder one by one and fire it up each time.
 
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The 4.7 is a very simple engine like i said before timing chains and lifters if you want to rule out lifters time consuming but pop the rockers off each cylinder one by one and fire it up each time.
Whelp, i found the issue.

This bolt right here is broken on the exhaust manifold. I took the shields off to look after replacing timing chains, tensioners, lifters, and rockers and the tick didn’t change. Also verified bottom end and cylinder/piston condition again and all of the above were in absolutely perfect condition with minimal to no signs of wear.

Took the passenger heat shield off, felt around, and quickly discovered the issue…

Might explain why it preforms so badly now too. Check engine light went away.
 

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Blackhawk

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Update:

I got the manifold bolt on the truck fixed, and it still ticks, to no avail. Had another shop look at it and they also couldn’t pin point the issue down for me.

I dropped the exhaust completely, made sure all fasteners etc were tight, noticed a loose heat shield on the passenger side of the cab over the exhaust, tightened that up, still to no avail.

Replaced the tensioners and lifters, still ticks. The loss in performance that i mentioned before is because of the knock sensor. Disabling it restores engine performance completely.

I’ve been driving it around, and it drives just fine aside from the stupid tick. I’ve had the engine torn down as far as i can with it still in the vehicle and i literally cannot find ANYTHING wrong with the engine. 1K miles put on the truck and even though the oil is dirty, the oil is clean and has 0 metal on the dipstick. This is AFTER running the truck up to 134MPH on a long stretch of flat road trying to get it to fail.

Only thing left to do is EGR valve maybe. I hear the tick loudest from it vs anything else, but wouldn’t that send a code? It had a code for the EGR valve sound 6 years ago that cleared itself.

I’m not willing to give up on this engine quite yet, especially given the fact it was produced within 3 days of the 4.7 cut off date.
 
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Late update:

Turns out it wasn’t manifold bolts. I had the broken ones replaced along with new gaskets and so on, and the ticking didn’t go away.

So, i decided to experiment a little. Took the drivers valve cover off as the noise was louder there on Cyl 7. I then took off each rocker and I think i found the issue.

Without both rockers, engine would run just fine, no ticking, no abnormal noises at all aside from it misfiring (obviously.) I put in the intake rocker, engine would start just fine, everything would be just fine with no ticking at all. As soon as i put the exhaust rocker in, the tick immediately came back.

I don’t know what to make of it, but i know i have to pull the head. The cam is in good shape so i know that isn’t the issue, but im thinking it burned a valve. Explains the slightly lower compression too.
 
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