Grinding, " diesel " noise under valve covers

RustyRatRod

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Nah, Brother, No Way on that!!!!!!! Now about the Lil bits O' Copper? Ain't that inner bearing material? Or am I still wacked? I don't think that's related, but I'm a lifetime Carpenter, not a Lifetime Pro Mechanic
The copper material in the bearings is on the bottom. It would have had to wear through two or three layers of metal to get to the copper. There'd be a lot of metal. There's not. It could be anything. Every single engine has minute amounts of metal in the oil. Normal.
First thing I thought. My dad has a GTX with a 440 in it. The motor was built years ago, I'm assuming with TRWs in it. Sounds exactly like his video.
Well, My hearing is terrible, I admit. But what "I'M" hearing sounds like piston slap. That's the problem with being online. You just never can be 100% sure.
 

Ironracer

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Man, that's much appreciated from both Y'all! I've got so many issues right now, if I add the Mopar to it, I'd probably keel over! Not being a Pro Mechanical Tech, seeing that stuff FREAKED ME OUT MAN!!!!!! AHHHHH! LOL
 

RustyRatRod

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Use the process of elimination. If it has a diesel kinda sound, then that means whatever it is, all eight pretty much have to be involved. Right? Does it sound like ALL EIGHT of something? If it does, stop and think about it. What are the chances of all eight rod bearings knocking? The same amount? A rod knock is "about" the only other thing......with the exception of maybe wristpins that can produce that sound. Full floating wristpins is another thing that can do it. Do you remember if they are pressed or floating pins? With floating pins, you can get some noise from BOTH the pins AND the piston slap. It's like I said early on in this thread. A real HP engine with loose tolerances and floating pins is GONNA make some noise. Even pressed pin engines will make noise with real HP old school clearances.
 

dukeboy_318

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Sounds like a clapped out engine to me. Probably needs a rebuild but I’d run it till she blows
 

Ironracer

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Use the process of elimination. If it has a diesel kinda sound, then that means whatever it is, all eight pretty much have to be involved. Right? Does it sound like ALL EIGHT of something? If it does, stop and think about it. What are the chances of all eight rod bearings knocking? The same amount? A rod knock is "about" the only other thing......with the exception of maybe wristpins that can produce that sound. Full floating wristpins is another thing that can do it. Do you remember if they are pressed or floating pins? With floating pins, you can get some noise from BOTH the pins AND the piston slap. It's like I said early on in this thread. A real HP engine with loose tolerances and floating pins is GONNA make some noise. Even pressed pin engines will make noise with real HP old school clearances.
A drag racing Mopar mechanic that was an aviation mechanic for Army sold me the short block assembled. He had 5 or more 340s. They were floating pins.. and the way you put that now makes total sense
 

MOPAROFFICIAL

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All eight wrist pins or skirts, or rods... or how about all 8 pistons tapping the heads...which i have seen before.
 

Bewy

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'Copper' in the oil? Could also be from the bronze bush that the oil pump drive shaft rides in.
 

Ironracer

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Maybe we'll never know

See if it goes away with some more throttle.

jk

I'd like to know myself...
I've ran her several times hard, since I've noticed it...always figured it was rockers rubbing. And they are! Lol when you give her throttle, it don't seem to get noticeably louder or worse.
 

inertia

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I maintain you still have rocker issues .
If you try to pinch two adjacent rocker together while it's running, I think you'll find they try to spread apart, and "clack" back together.
I also suspect that if you take the rocker/shafts off for inspection, they'll be interference marks on the side of the pshrods and rockers .
Won't take much to check, and replace header gskts while you're at it .
Lotsa posts .
Good luck !
 

CFD244

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Take 1/2 hour and swap out the rockers from your 318. Then you'll be able to put this hypothesis to rest one way or another.:)
 

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