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Old 03-27-2020, 04:47 PM   #1
fdbdw
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New motor whining noise

New 454, whining noise that increases with RPMs when cold then goes away after warm up. Hard to pin point with naked ear, threw on a stethoscope and my best guess is that it’s coming from the distributor ( but not positive). Anyone have any thoughts or experiences with this?
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Old 03-27-2020, 05:14 PM   #2
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Re: New motor whining noise

Can you make a recording and play it back for us?
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Old 03-27-2020, 05:19 PM   #3
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Re: New motor whining noise

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Originally Posted by Steeveedee View Post
Can you make a recording and play it back for us?
I can, I’ll have to let it sit overnight and get cold. Definitely a a whine and not a vacuum whistle. Best way I can describe it is, sounds like a blower whine.
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Old 03-27-2020, 06:42 PM   #4
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Re: New motor whining noise

Maybe try removing belts and start,eliminate everything at the front first,
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Old 03-27-2020, 07:54 PM   #5
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Re: New motor whining noise

Stethoscope points me to the rear of the motor. Pulled distributor, gears look fine. I would be more worried about the gears not aligned but it goes away once warm. Working 24 hour shift tomorrow, be back at it Sunday.

Last edited by fdbdw; 03-27-2020 at 07:55 PM. Reason: Grammer
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Old 03-27-2020, 08:24 PM   #6
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Re: New motor whining noise

Are you using a solid steel cam gear?
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Old 04-01-2020, 08:34 AM   #7
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Re: New motor whining noise

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Are you using a solid steel cam gear?
Yes, melonized steel gear
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Old 04-01-2020, 08:38 AM   #8
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Re: New motor whining noise

Update, gears on the dizzy don’t show any wear or markings. Got to thinking about it last night. Wonder if it’s the torque converter leading me to the back of the motor , freshly rebuilt th400. Another long shift today, gonna investigate that tomorrow
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Old 04-01-2020, 09:41 AM   #9
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Re: New motor whining noise

I had a motor doing this. Micro imperfections in the cam finish. Go search youtube for cam whine.
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Old 04-01-2020, 10:02 AM   #10
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Re: New motor whining noise

Have seen BBC with High Volume Pumps pull the cam back towards the distributor causing wear between timing gear and block. Rare but drastic, check oil for metal or with distributor out check back and forth travel on cam.
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Old 04-01-2020, 10:04 AM   #11
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Re: New motor whining noise

Starter bendix not retracting fully and starter gear teeth barely touching flexplate?

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Old 04-01-2020, 11:32 AM   #12
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Re: New motor whining noise

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Originally Posted by fdbdw View Post
Yes, melonized steel gear
This can sometimes cause a whine. Though you have found it louder in the back.
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Old 04-01-2020, 11:47 AM   #13
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Re: New motor whining noise

Power steering pump?
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Old 04-01-2020, 02:58 PM   #14
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Re: New motor whining noise

Back of the engine, like near the passenger seat? If so experience tells me that is not going to go away for a loooooooong time.
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Old 04-01-2020, 03:29 PM   #15
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Re: New motor whining noise

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Back of the engine, like near the passenger seat? If so experience tells me that is not going to go away for a loooooooong time.
LOL.

I'm thinking dizzy related. Use some marking compound on the gear, assemble and rotate then check it.

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Old 04-01-2020, 03:35 PM   #16
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Re: New motor whining noise

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Back of the engine, like near the passenger seat? If so experience tells me that is not going to go away for a loooooooong time.
Nailed it, sometimes I overlook the obvious
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Old 04-01-2020, 08:13 PM   #17
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Re: New motor whining noise

Newly rebuild TH400? Any performance upgrades in the tranny? I'd bet your transmission is starving for fluid, change the filter to a high flow/performance. I had the same issue with my newly rebuilt 454 TH400 combo. Changed the filter and it was good as new.

Edit* My issue sounded exactly like blower whine, changed with RPM as well as gear shifts, and went away as soon as the transmission warmed up.
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Old 04-02-2020, 09:53 AM   #18
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Re: New motor whining noise

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Originally Posted by JMD View Post
Newly rebuild TH400? Any performance upgrades in the tranny? I'd bet your transmission is starving for fluid, change the filter to a high flow/performance. I had the same issue with my newly rebuilt 454 TH400 combo. Changed the filter and it was good as new.

Edit* My issue sounded exactly like blower whine, changed with RPM as well as gear shifts, and went away as soon as the transmission warmed up.
I've had the same noise as well. Use the bronze mesh style filter, it will take care of it if that is the source.
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Old 04-27-2020, 05:14 PM   #19
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Re: New motor whining noise

Just wanted to update.
Turns out it was the torque converter from my TH350 I re-used in the TH400.
Had some fine flakes in the fluid . Replaced converter, fluid & filter , tranny all cleaned up
All good now, I appreciate all the input.
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Old 04-27-2020, 05:53 PM   #20
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Re: New motor whining noise

Good to see that it's fixed, and thanks for letting us know!
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