Thanks to all who answered. I just posted an update video.

The sound doesn't seem consistent for an engine problem more than likethe flexplate is cracked. Unbolt the flexplate from the torque converter and push the torque converter back a little bit and fire up the engine if the sound is still there then it is a engine problem if the sound is gone its most likely the flexplate. That would be my next step. Good luck if you have any question please reach out to me.

@georgemaxfield9142

Ай бұрын

I agree. Motor ran smooth and couldn't determine where knocking noise was coming from. Used a probe for noise which took me to the rear of motor. Was confused until I was told to look for a crack in flexplate and saw it myself.

@waylonk2453

Ай бұрын

I remember a Grind Hard Plumbing Company video where their HMMWVE had a similar sound. Sure enough, the flex plate was badly cracked. I've never taken one apart but it seems easier than dropping the oil pan or uninstalling most of the turbo system

@TahoeSteve

Ай бұрын

Thanks. I just posted an update video.

Just a thought. You could get a remote camera and stick down inside sparkplug holes and see what you find. You could also send off the oil to see what the milky substance is. Other than that, you kindof have to separate parts and see where the sound is coming from.

I agree with the two gentlemen that suggest separating torque converter from the engine and start it. Definitely sounds like a flywheel/torque converter issue. Just out of curiosity ,why aren’t you bringing this back to the guy who rebuilt the engine?

Unbolt the torque converter and slide it back away from the flexplate. Crank the engine and see if the noise is still there. It looks like a circle D converter. If it's a triple disc then they are known to rattle the disc when tcc isn't locked up.

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I wouldn't be sticking screwdrivers in the spark plug holes. I think you really have to pull the pan if you want to properly check out the bottom end. It's really hard to tell from the audio on the video clip you showed but to me it didn't sound like an internal engine issue, but maybe it sounded different in person. I assume you grabbed everything externally that you could get your hands on and give it a shake to make sure it wasn't loose. It sounded like it could have even been the exhaust clanking on something. Also, that didn't look like coolant in the oil to me. It did look like metal but I'm not sure it's more than you would expect after a fresh rebuild. No chunks at least. Of course this is just one more non professional opinion from an internet rando and we all know about opinions. :) I was just on your channel for the TX16S videos but I do also have some mechanical background. :)

Steve my name is James i also have installed a turbo on my Tahoe 07 5.3 now with a 4l80 swap. i have alto of info for you or any one that might be interested. i have been tooling on this truck for over a 7 year process. it runs fine ATM. please contact if you wish

@TahoeSteve

Ай бұрын

Thanks. I just posted an update video.

Drop the pan before you start tearing the engine apart.

Seperate trans from engine. Run engine...

@TahoeSteve

Ай бұрын

Thanks. I just posted an update video.