Whine in Engine Compartment

Helix57

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Jun 28, 2020
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I have installed a 85 GT motor and entire drivetrain into a 66 Mustang Convertible. I am hearing a loud whine coming from under the hood. Noise is intermitten, come and goes. Mostly when driving, when I slow down to get a better listen it quits. RPM changes have no effect on whine. Have changed power steering pump, rack and pinion. Noise is still there. Any help would be greatly appreciated. Thanks
 
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7991LXnSHO

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Do who did you shut under the hood that is whining about it? :eek:

It’s time for a mechanic’s Stethoscope. (HFT has them if the local parts chain does not.)
Other options include a loooong screwdriver or piece of hose to your ear.
That it does not change with RPM but does with speed sounds more like a transmission or drivelineissue. But vacuum leaks and engine and accessory noises would be a good place to start since it is sounding under the hood.
 
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7991LXnSHO

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Mike, I worry about the friendly neighborhood ninja cat ending up under the hood this time of year. Based on how he reacts to our 4-H show dogs if he follows us into the house, getting stuck under the hood would result in a very loud hiss and yowling. And he would leave claw marks, lots of claw marks, when the starter engaged.
@Helix57 please let us know what you find after you have a listen. We’ll try to be serious when we can help.
 

Mustang5L5

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Could be alternator or water pump bearing. Could be one of the idler pullies. Basically anything that spins is fair game. Youlll need a mechanics stethoscope