Creaky/Groaning Sound in the Back

[PotooBrigham]

Hello again.
In the past month, a rather concerning sound has started forming near the back of my car, especially when turning. It's become audible enough to keep me from driving it on the weekends, which is frankly depressing. I've provided a video below:

https://www.youtube.com/watch?v=2azUh09GaQg
I started searching on YouTube and a fair bit of backtracking on this very forum to see what it might be, and I've narrowed it down to the trailing arm, one of the bushings (wouldn't surprise me considering how rubber ages), or perhaps the spring itself, which is kinda dirty/rusty. I'd like to be 100% sure before I try to send it to any mechanic; I don't have a garage to attempt fixing anything myself, nor do I have any experience.
The clunking/groaning only sounds when driving; When I try to push or bounce the car up and down, no noise is made.
Also provided are some shots of the rear driver-side wheel where it feels like the noise is strongest Obviously, she's not concours:

https://cdn.discordapp.com/attachments/655518900414578695/893328140888318052/IMG_20210916_1521522.jpg
https://cdn.discordapp.com/attachments/655518900414578695/893328486108897290/IMG_20210916_1522261.jpg
https://cdn.discordapp.com/attachments/655518900414578695/893328486809354260/IMG_20210916_1522226.jpg
https://cdn.discordapp.com/attachments/655518900414578695/893329295131439104/IMG_20210916_1522029.jpg

What would you folks recommend to remedy this?

[82DMC12]

Something is seriously loose. Sounds like a wheel bearing or the trailing arm pivot. I'm hearing more of a clunking than a squeaking though.

I had a squeaking sound at low speed and even with the car parked and I leaned into the passenger side door, like to work on the fuse area. It was my shocks/springs. I replaced with coilovers and it went away.

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[Azar]

Sounds like something in the driveline and not suspension. Wheel bearing probably it. Try to juck up the car and spin the wheel. But again, without the load the sound might not be coming.

[SS Spoiler]

how about the curved bar that goes behind
the block and bolts to the frame? loose bolts?

[PotooBrigham]

how about the curved bar that goes behind
the block and bolts to the frame? loose bolts?

Curved bar?

[Ron]

You might try leaving it in gear (or park) and e-brake off, then check out what everything does underneath while someone else rocks the car forward and back/bounces the rear up and down. Or, with it on the ground, try to wiggle anything you can reach with a pry bar....

[Rich]

Curved bar?

The crossbrace. It's painted black - a bent round tube with flat ends bolted to the top of each side of the frame on each side of the engine.

Item 6 in this diagram (https://store.delorean.com/parts/frame-body/8-1-0-frame.html).

[PotooBrigham]

The crossbrace. It's painted black - a bent round tube with flat ends bolted to the top of each side of the frame on each side of the engine.

Item 6 in this diagram (https://store.delorean.com/parts/frame-body/8-1-0-frame.html).

Ah, I see. How do I get to that?

[Rich]

You'll find the crossbrace running across the firewall behind the engine. The ends sit on top of a flange in the body tub on each side. The bolts go through the flat ends of the brace, then through the tub flange and into the frame.

Get to the left one easily. It's in plain sight. Remove the ignition/connector cover in the right rear corner of the bay - if your car still has one of those - for better access to the right one.

This photo (http://www.noroads.com/delorean/projects/engine/images/DSC_2104.jpg) shows the black brace and its bolts clearly since the engine isn't fully built up.

I'd guess the noise in your video is from something else but since loose body bolts are a thing with this car it never hurts to check any of them and these are among the easier ones to get to.

[andyo]

I had a similar sound coming from my front wheel. Turned out it was the bearing. It makes an awful sounding noise, but magically when you take the weight off of it and spin the wheel it did not make the sound at all. I changed out the bearing and its all good now.

Heres a video of my issue.

https://youtu.be/urwCInc1LYI


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[PotooBrigham]

You'll find the crossbrace running across the firewall behind the engine. The ends sit on top of a flange in the body tub on each side. The bolts go through the flat ends of the brace, then through the tub flange and into the frame.

Get to the left one easily. It's in plain sight. Remove the ignition/connector cover in the right rear corner of the bay - if your car still has one of those - for better access to the right one.

This photo (http://www.noroads.com/delorean/projects/engine/images/DSC_2104.jpg) shows the black brace and its bolts clearly since the engine isn't fully built up.

I'd guess the noise in your video is from something else but since loose body bolts are a thing with this car it never hurts to check any of them and these are among the easier ones to get to.

Tightened the crossbrace bolts, so I can scratch that off.
Unfortunately, the clunking still continues.

[PotooBrigham]

So a small update:
https://cdn.discordapp.com/attachments/655518900414578695/900100213291745290/IMG_20211015_1805199.jpg
Looking further into the spring I found the rear shock is missing an entire chunk. Whether it's the actual source of the clunking or a result of a possible bushing I'm not sure, but now I have to look into a replacement. DMCH No longer has the rear shocks in stock ($75 for a pair would've been just dandy), and I find it incredibly inconvenient that other offerings for shocks are between $600-1k for front and back. I mean, I just need rear shocks. What to do?

[82DMC12]

So a small update:
https://cdn.discordapp.com/attachments/655518900414578695/900100213291745290/IMG_20211015_1805199.jpg
Looking further into the spring I found the rear shock is missing an entire chunk. Whether it's the actual source of the clunking or a result of a possible bushing I'm not sure, but now I have to look into a replacement. DMCH No longer has the rear shocks in stock ($75 for a pair would've been just dandy), and I find it incredibly inconvenient that other offerings for shocks are between $600-1k for front and back. I mean, I just need rear shocks. What to do?

That broken dust cover won't cause the clunk. Are these the original 40 year old shocks? Definitely do not try to replace just one shock - always go in pairs. DeLorean EU does sell individual rear shocks for like $100 each so you don't have to go really fancy for hundreds of $$$ if you don't want to. But if you have all the original shocks, it's probably time to change all four.

[PotooBrigham]

That broken dust cover won't cause the clunk. Are these the original 40 year old shocks? Definitely do not try to replace just one shock - always go in pairs. DeLorean EU does sell individual rear shocks for like $100 each so you don't have to go really fancy for hundreds of $$$ if you don't want to. But if you have all the original shocks, it's probably time to change all four.

I def plan to replace the pair.
I don't think the front shocks are original, as the nose is lowered to its intended ride height.

[82DMC12]

I def plan to replace the pair.
I don't think the front shocks are original, as the nose is lowered to its intended ride height.

FYI, on the front, it is possible to install lowering springs, like PJ Grady's springs, without necessarily replacing the front shocks. If the shocks say Girling on them they are probably original.

[PotooBrigham]

I had a cousin stop by and help me prop the car up the other day, and lo and behold, we discovered the entire rear driver's side wheel rattled up and down with considerable play.

https://www.youtube.com/watch?v=fgS_gfbW93M


I was under the assumption that if I tightened up any loose bolts in the wheel, maybe that'd fix things, but to be sure, we decided to take out the whole wheel and be sure nothing's wrong with the hubs.

So after it munched through a torque wrench and breaker bar adapter, we succeeded in removing the wheel to find the hub, brakes and all, unstable and wiggly. And a large nut in the center to be alarmingly loose, pictured here:
https://i.gyazo.com/2b94db274fbcea3b4994f778b348e217.png

According to google, it's a Stub Axle Nut; when we got to it, it was loose enough to turn by hand. Pretty sure it shouldn't.
We tightened it until the hub no longer wiggled, buttoned the wheel back in, and praise the heavens, the groaning/clunking disappeared!




For exactly 2 days.


Last night I took the D on a drive to a family member, but on the way back, the groaning not only came back, but intensified to a very uncomfortable degree. Couldn't make it home out of fear of breaking something, I'm frankly heartbroken.

What can I do from here? Did I miss something?

[Ethan Rode]

If your stub axle nut was loose, the wheel bearing is definitely toast. I'd wager the bearing or the rotor scraping on the brakes is the source of your noise. Make sure you carefully inspect the stub axle and hub, as they too may be damaged.

[PotooBrigham]

If your stub axle nut was loose, the wheel bearing is definitely toast. I'd wager the bearing or the rotor scraping on the brakes is the source of your noise. Make sure you carefully inspect the stub axle and hub, as they too may be damaged.

Which is the bearing I should look out for?

[82DMC12]

It's inside the hub which is what all the lug nut studs are mounted into. Most people "find it" when they attempt to remove their rotor because you have to take the hub off of the spindle which usually destroys the front wheel bearing.

You need to get the front up, take the wheel off, remove the axle stub nut again, remove the D-washer under it, remove the brake caliper and suspend it in the air so the brake lines don't get pulled or kinked (or like set it on a box or something so it's not just dangling there), then slide the hub off of the spindle which will probably reveal a blown up wheel bearing.

Get a new wheel bearing and have a mechanic or machine shop press out the old bearing and press the new one in. Try to get an SKF (Italy) bearing and not some cheap china shit.

Get a new axle stub nut and carefully inspect the threads on the spindle to make sure they aren't damaged. Also check the other stub nut on the backside of the spindle and make sure it is super tight. You have to tighten the inner stub nut before tightening the outer stub nut. If we are talking about the driver side, the angle drive is the inner stub nut. Torque values are listed in the shop manual but I think the inner nut is 170 lb and the outer nut is 150 lb.

Check the hub spacer which goes between the wheel bearing and the steering knuckle to make sure it's not cracked or broken. Both of mine were.

To reassemble, clean the spindle really well and make sure there is no grit or crap on it. Put a very light coating of grease on the spindle. Then slide the hub all the way onto the spindle. It should be a tight fit but should slide on smoothly.

Then put the D washer and your new axle stub nut on and tighten. If it's the driver side, put the angle drive cup back on. Reattach the brake caliper and you should be good to go.



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[Ron]

Which is the bearing I should look out for?
Number 8 (https://store.delorean.com/100973-rear-wheel-bearing.html) in the drawing HERE (https://store.delorean.com/parts/manual-transmission/4-7-0-drive-axles.html).

[andyo]

Definitely replace that bearing and also get new Hub axle nuts. The hub nuts have a locking tension designed into the threads, they can wear out after repeated use. That is why they are recommended to be replaced any time the are loosened since you don't know how many times its been done before.

The rear bearing is pressed into the hub carrier, not a trivial thing to replace.

[82DMC12]

Sorry man, all the stuff I wrote this morning was for the FRONT wheel bearings. I can't edit the post.

But yeah the rear wheel bearing is hard to do. I opted to remove the rear carrier and take it to a machine shop so it can be professionally replaced while I did a full overhaul of the rear suspension.

Watch this video:

https://www.youtube.com/watch?v=oIP5NSeJCBM

Apologies for the confusion!!

[PotooBrigham]

If your stub axle nut was loose, the wheel bearing is definitely toast. I'd wager the bearing or the rotor scraping on the brakes is the source of your noise. Make sure you carefully inspect the stub axle and hub, as they too may be damaged.


Definitely replace that bearing and also get new Hub axle nuts. The hub nuts have a locking tension designed into the threads, they can wear out after repeated use. That is why they are recommended to be replaced any time the are loosened since you don't know how many times its been done before.

The rear bearing is pressed into the hub carrier, not a trivial thing to replace.




But yeah the rear wheel bearing is hard to do. I opted to remove the rear carrier and take it to a machine shop so it can be professionally replaced while I did a full overhaul of the rear suspension.

Watch this video:

https://www.youtube.com/watch?v=oIP5NSeJCBM

Apologies for the confusion!!

Aw dang, that's a fair bit of an issue.

I'll give the video a look, grab the necessary parts, and will update if anything changes. Any continued advice is massively appreciated.