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Jake
Jake, Auto Mechanic
Category: Lincoln
Satisfied Customers: 4831
Experience:  Auto & collision tech
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I have a loud clunking noise at the rear side of my 2014

Customer Question

I have a loud clunking noise at the rear side of my 2014 Lincoln MKZ
JA: Where exactly do you think the noise is coming from? And how long has this been going on?
Customer: When ever I begin the motion to drive it sounds loud but when it’s on top speed the sound goes away
JA: Are you fixing your MKZ yourself? What have you tried so far?
Customer: Yes
JA: Anything else you want the mechanic to know before I connect you?
Customer: I have changed the calipers and brakes but the sound is coming from the rear
Submitted: 7 months ago.
Category: Lincoln
Expert:  Jake replied 7 months ago.

Hey there, thanks for the question.

Is your MKZ front wheel drive or all wheel drive model?

Customer: replied 7 months ago.
It’s all wheel drive
Expert:  Jake replied 7 months ago.

does the clunking speed increase with vehicle speed? or is it more random?

Customer: replied 7 months ago.
There’s no clunking noise when the speed increases
Customer: replied 7 months ago.
Sometimes it’s random
Expert:  Jake replied 7 months ago.

Thanks, ***** *****

You accelerate and it clunks? one cluknk or multiple clunks?

The clunk or clunks STOPS at what speed?

Customer: replied 7 months ago.
It clunks when I begin driving within 20 and stops when I hit 60 or 70
Customer: replied 7 months ago.
When the car is slowly driving then it clunks but at high speed it stops. Sometimes it may be random
Expert:  Jake replied 7 months ago.

Thank you, ***** ***** quite a few possibilities to be honest.

The more random the clunking is the more likely its going to be suspension related. something like a loose or worn strut mount would cause an occasional clunk on one of the corners.

If the clunking was less random and seemed more rythmic then it's likely related to the drive shaft or carrier bearing. This could easily be ruled out by temporarily removing the drive shaft and letting it run on a lift and see if it dissapears.

lastly if it clunks more ONLY in turns and incorporates a vibration it could be related to the rear diff.

anyone of these issues could see to resolve at speed, since you at final drive and the shaft is spinning and a very high rate of speed. it woul dbe most noticeable on acceleration UNLESS it was suspension related.

Customer: replied 7 months ago.
It happens too when I make a turn. A loud vibrating sound comes
Expert:  Jake replied 7 months ago.

thats LESS likely a suspension issue.

Your looking more likely to have a carrier bearing or rear diff issue.

The car will need to be put on a lift and it identified. They can then remove the shaft and verify if that's it.

Customer: replied 7 months ago.
Can the carrier bearing be replaced?
Expert:  Jake replied 7 months ago.

Yes, absolutely but don't throw parts at it just yet.

have it confirmed.

Customer: replied 7 months ago.
Thank you
Customer: replied 7 months ago.
Do you have diagrams
Expert:  Jake replied 7 months ago.

Your welcome, which diagram are you looking for?

Customer: replied 7 months ago.
The carrier bearing and differential
Customer: replied 7 months ago.
For a 3.7l engine
Expert:  Jake replied 7 months ago.

i cannot pull the diagrams for this i tried and the dealer parts system shows the driveshaft assembly with the carrier as a unit, only the clutch diff seperately.

You can get it aftermarket seperate from the shaft though, to remove it you simply remove the driveshaft and joint, pull the carrier off and use a jaw puller to seperate the original bearing form the shaft, clean it up real good, grease it, then install teh new one and torque it down.

Expert:  Jake replied 7 months ago.

if there is anything else I can do to help let me know.

If not, all i ask is that you leave a kind rating.

thanks.

Customer: replied 7 months ago.
Pls help me with the last one. The trunk of my Lincoln MKZ 2014 3.7 fails to open. I have changed all the components.
Expert:  Jake replied 7 months ago.
Did you make sure the valet switch is off?
Customer: replied 7 months ago.
it’s off. I never set a valet switch. But where is it located.
Expert:  Jake replied 7 months ago.
In the glove box
Expert:  Jake replied 7 months ago.
People generally set them on accident
Customer: replied 7 months ago.
It’s off. And it’s located on the touch screen.
Expert:  Jake replied 7 months ago.
Interesting most manufacturers put them in the glove box because it’s lockable.Granted some have an off switch and a valet switch.Anyways, does it no work by the FOB or by the switch?
Customer: replied 7 months ago.
The keyfob and switch does not work. First it was taken time to open or close then it stopped.
I found a drain plug on the carrier case. Can I fill more fluid to stop the noise and what kind or fluid.
Expert:  Jake replied 7 months ago.
You must be talking about the transfer case, no fluid for the carrier.So does the trunk pop but not lift? Or just won’t open at all?
Expert:  Jake replied 7 months ago.
Clarify please
Customer: replied 7 months ago.
the transfer case has a drain plug. Do you think the issue is from lack of lubricant or bearing needs to be changed? As for the trunk I can open it manually using the release string from the inside. But does not work automatically
Customer: replied 7 months ago.
It does not pop and lift. I can only open it using the release string from the inside
Customer: replied 7 months ago.
The car was placed on a lift and it never clunked. What is your suggestion?
Expert:  Jake replied 7 months ago.
When it doesn’t clunk on the lift, then it’s usually suspension or differential related. Have seen the rear diffs not make noise on the lift. You really have to isolate the exact location of the noise. Seems like the more we chat the more the details change here.
Expert:  Jake replied 7 months ago.

If you need additional help with this please let me know!

If not, please just be sure to leave me a kind rating so the site credits me for my time is all.

thanks.