Just watched to the IG video- yeah that's pretty loud. Maybe a dumb question but is the balancer bolt tight? Harmonics can be a weird thing, maybe new exhaust is vibrating something that wasn't being vibrated before?
BUILD THREAD Project Olds Cool (Recognition!!)
- Thread starter Rktpwrd
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Balancer bolt is definitely tight. And it’s a good one, I replaced the original with an ARP one.
That's one of Mr. Sony's Buick 350's. It's a bit unnerving seeing those busted flexplates walking around like that.
Did you have the jack under the oil pan? Any chance it is now contacting the rotating assembly? Doesn't seem likely but I'm trying to come up with a scenario where jacking up the power team led to the noise.
Yes, we lifted it up by the oil pan, but did it with a large 2x6 under the pan to distribute the load. No damage to the pan whatsoever, not a dent or buckle, didn’t even wrinkle the paint.
Ok guys, I got 2 new videos of the sound, they both capture it pretty well. Especially the second one:
www.instagram.com
D Gilliham on Instagram: "Got a new nasty noise I’m trying to diagnose, posting these vids for the guys on the forum to help me. #problems #hatenewnoises #notabelt #nottheaccessories"
25 likes, 9 comments - rktpwrd5 on February 24, 2021: "Got a new nasty noise I’m trying to diagnose, posting these vids for the guys on the forum to help me. #problems #hatenewnoises #notabelt #nottheaccessories".
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liquidh8
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I watched that video, Kinda hard to tell on my phone. Need to watch it on a non-government computer.
Pull the flex plate cover to start, I have had many strange sounds from there. Almost sounds like belt slippage but farther away.
That's definitely a strange noise. Sounds like something scraping/scuffing. Doesn't sound like a rod knock. What about turning the engine back and forth by that ARP balancer bolt to check timing chain backlash? You can feel the resistance if the chain is unduly stretched. Or grab hold of the balancer and move it up and down and see if you can detect any movement? Safety tip: if you do any of this, don't do it when the engine is running! 🙂 I'm reaching for straws here.
I considered a seal issue for a second, but usually those would get tore up from the floor up if they spun or went dry. But I wouldn't rule it out.
At this point I would agree with olds307 and 403 suggestion of popping the converter inspection cover. I had a TC ear crack off on me and it made a pretty bad noise, but only sometimes, and I chased that sh*t forever until about a year later I found it when I dropped the transmission to rebuild it. Not saying that's where to look, just pointing out chasing ghost sounds needs more than Scooby-f*cking-Doo. ZOINKS!
I considered a seal issue for a second, but usually those would get tore up from the floor up if they spun or went dry. But I wouldn't rule it out.
At this point I would agree with olds307 and 403 suggestion of popping the converter inspection cover. I had a TC ear crack off on me and it made a pretty bad noise, but only sometimes, and I chased that sh*t forever until about a year later I found it when I dropped the transmission to rebuild it. Not saying that's where to look, just pointing out chasing ghost sounds needs more than Scooby-f*cking-Doo. ZOINKS!
Might be a wild goose chase but if the flex plate ends up being a non issue, you can always do an easy check of the cam (since it is flat tappet) and pull the valve covers, put a paint marker line vertically on each push rod and see if they are turning when the engine is cranking. If a lobe is going out or a lifter is sticky that push rod won't rotate as freely.
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