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EFV-8 Club Forum / General Ford Discussion / Strange noise

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46coupe

01-30-2020 @ 4:06 AM

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The car is a 46 sedan coupe. Cooper has a new noise which I hope you all can help me diagnose without being here. I'll try to be brief, but detailed.
Car at idle, no noise. Driving through the gears the noise starts and continues at the same level no matter what the speed. It only happens on acceleration. When my foot is off the gas,no noise. The sound is metallic, like two objects moving against each other, or a very fast vibration.
I'm going to check for loose covers, pipes, etc but thought I would contact all of you for more ideas. Possibly someone has experienced this on their car, I'll try to answer any questions anyone might have, as I know that it is very difficult to diagnose something like this from a distance.
Thanks for any help you can provide.

cliftford

01-30-2020 @ 6:34 AM

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Just a wild guess: worn u joint or torque tube bearing.

sarahcecelia

01-30-2020 @ 6:56 AM

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If it's a "whine,", in all probabiltiy, it 's the rear end. Could be worn ring gear, pinion gear, or bearings.Could also be the transmission gears or bearings.

The way to find out is have someone sit in the rear seat to listen to the rear; not the rear?; transmisssion!

Regards, Steve Lee

This message was edited by sarahcecelia on 1-30-20 @ 7:06 AM

46coupe

01-30-2020 @ 7:57 AM

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Good suggestions. I'll be checking them out. However, when I lift off the accelerator the car is still in gear and the noise stops. Wouldn't the gears in either location still be making the noise only slower due to the car slowing down? I'm planning on putting the car on a lift and running the it in gear to see if the noise happens when there is no load on the car.
If there is a noise I can check where it is coming from.

ford38v8

01-30-2020 @ 8:38 AM

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Your motor mounts may be worn out, causing your engine to lean to the side as you accelerate, bringing your fan blade close to the radiator, which ticks and clicks when it touches. The lean over may also cause your exhaust pipe to vibrate against the frame.

Alan

46coupe

01-30-2020 @ 11:38 AM

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Alan,
Thanks for the suggestion. I plan on replacing the mounts soon. Have them on my bench. My passenger side mount is the worse of the two. If that is what is happening would the blade leave small marks on the radiator? Revving the engine when the car is not moving doesn't make the noise. only when moving. I'll check it now anyway.

ford38v8

01-30-2020 @ 12:32 PM

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Revving in neutral wouldn't torque the engine sufficiently to twist it sideways on the motor mounts, however, making the engine work against the driveline would do it. Yes, there may be marks on the radiator, but remember it only takes a small contact point to make the noise you describe.

Alan

PS~ As a side note on changing motor mounts, refresh your lower hoses at the same time to avoid issues with them later. This is the time to do both jobs together, the hoses will self align with the radiator outlets as you lower the motor onto the motor mounts, all you need do is to guide the hoses on while lowering. Remember to use a short section of 2x8 under the oil pan to prevent damage from the floor jack, and eyeball the oil sender unit for interference with the firewall.

This message was edited by ford38v8 on 1-30-20 @ 12:42 PM

46coupe

01-30-2020 @ 12:49 PM

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I checked the radiator and there is an arc mark on the passenger side of center on the radiator. It's not much and could have been there all along. It's a little shiny so I think I'll blacken it, drive the car and see if it comes back.
I have no one to help with the motor mount install, which seems easier than tearing down the rear end or trans.
Thanks and I will let you all know what I find in a few days.

sarahcecelia

01-30-2020 @ 2:33 PM

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No! A whine in the rear or in the transmission could go away, but not necessarily! It could contine when you let of of the gas.

Regards, Steve Lee

sarahcecelia

01-30-2020 @ 2:39 PM

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I seriously doubt that it's the fan hitting the radiator; that would be too obvious. you'd see marks on the fins on the inner side of it, and that would NOT be a noise only in gerar and driving; you'd hear it at idle speed,because those fan blades are stiff and do not flex!'

IT's IN THE TRANSMISSION ORV REAR END!!

Regards, Steve Lee

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