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-   -   123 complete new front end, still cluck/groan (http://www.peachparts.com/shopforum/diesel-discussion/401241-123-complete-new-front-end-still-cluck-groan.html)

Madmax55 09-25-2019 11:55 AM

123 complete new front end, still cluck/groan
 
Hello everyone.

recently replaced all of the following with Genuine Mercedes-Benz parts.

- Upper Control Arms
- Lower Ball Joints
- Lower Control Arm Bushings & tubes
- Guide Rod Mount in LCA
- Front Sway Bar Bushings
- Idler Arm Bushings
- Both Steering arms
- Center Drag Link
- Steering Stabilizer Shock
- new spring pads
- Replaced Steering Box with tight good unit

The only thing in the front that is not new is are the Guide rod mounts. they were replaced in 2015 with Lemförder units, mechanic said they are good.


All of above being said you can hear a groan/creak on the passenger side when you press on the fender and occasionally while driving.

You can also hear/feel a clunk in the floor board sometimes but not always over bumps or coming to a stop. but again not always. this noise is very rare but has happened twice since Saturday

I also have a cluck noise when turning. I could say its bad motor mounts or something else moving in the engine bay but the motor mounts are Genuine MB replaced in 2015.

I am sort of at a loss as to why all these noises are persisting when literally everything is new. Should I have greased the sway bar bushings? anything else to check?

car drives SO much better now but the noises should be gone.

vwnate1 09-25-2019 10:46 PM

The center drag link isn't available via M-B for several years now .

The noise you describe sounds like the rear end of the guide rods, try spraying some silicone from a foo-foo can and see if that quietens it a bit .

Madmax55 10-02-2019 12:05 PM

thanks for the reply! been driving the car and checking things one by one to see if anything changes.

you are right about the center link, everything else though is MB.

I haven't done the guide rod mount lub spray yet but will tonight or tomorrow. I double checked the sway bar bushings and tightness on most every suspension component.

I am beginning to think the clucking and noises while turning left or right is maybe something larger loose, perhaps loose motor mounts? or something else. drive me nuts as the car handles great and super tight but the noises and how you feel these "clunks" in the steering wheel are disheartening after all these new front end bits

MB140300SD 10-02-2019 09:22 PM

That would usually be caused by the guide rod mounts. If they were done in 15 it is probably time again.

Madmax55 10-03-2019 08:39 AM

so in 4 years they fail? the originals seemed to last nearly 40 years. If I can confirm that I'm buying the genuine ones, 3 times the price for 10 times the lifespan isn't too bad. . .even though they are pricey

vwnate1 10-03-2019 09:50 AM

FEELING Clunks
 
If you feel them in the steering wheel I'd be looking at the steering box to unibody bolts right quick ~ once there's any damage to the unibody you're in the soup deep .

Madmax55 11-21-2019 08:35 AM

UPDATE, replaced Lower Guide Rod Mounts with Genuine MB ones.

Car still has a clunk in the footwells occasionally when coming to a stop or accelerating and has this clunk when turning. Literally everything for the steering and front suspension is new.

also sometimes have this sensation of something sliding or pivoting when I turn, if you can imagine something that rocks from side to side under heavy turning, making me think something is loose but ive checked again all front end stuff and even tried to tighten down the motor mounts again and added a new Mercedes-Benz engine shock, no change

@vwnate1 the bolts are tight!

Does anyone have any idea?

Diseasel300 11-21-2019 10:35 AM

So you replaced the guide rod mount in the LCA, how about the 4 big rubber bushings (2 on each side) and the massive ball joint that the guide rod attaches to? I don't see either mentioned anywhere in your post and they'd be the very first suspect.

Madmax55 11-21-2019 10:39 AM

Quote:

Originally Posted by Diseasel300 (Post 3978994)
So you replaced the guide rod mount in the LCA, how about the 4 big rubber bushings (2 on each side) and the massive ball joint that the guide rod attaches to? I don't see either mentioned anywhere in your post and they'd be the very first suspect.



yes the mounts in the control arms and the actual rear mount, the big one you mention was what was just replaced.

Diseasel300 11-21-2019 10:41 AM

Did you replace the 4 big rubber mounts that hold the big mount's frame? They're a major pill, but guaranteed collapsed by now if you haven't.

Madmax55 11-21-2019 11:01 AM

3 Attachment(s)
Quote:

Originally Posted by Diseasel300 (Post 3978997)
Did you replace the 4 big rubber mounts that hold the big mount's frame? They're a major pill, but guaranteed collapsed by now if you haven't.

sorry drawing a blank on what you are describing. the w123 chassis has

1) rear guide rod mount(looks like big ball joint) which is bolted to body
2) lower control arm bushings and ball joint and mount point under spring for the guide rod itself.
3) upper control arm which comes with bushings and ball joints for inner and outer to mount to sway bar

I've attached some pictures from the EPC

Diseasel300 11-21-2019 11:13 AM

Does the big ass ball joint not mount into a carrier like it does on the 126?
http://www.peachparts.com/shopforum/...t-100_0083.jpg

Madmax55 11-21-2019 11:14 AM

Quote:

Originally Posted by Diseasel300 (Post 3979005)
Does the big ass ball joint not mount into a carrier like it does on the 126?
http://www.peachparts.com/shopforum/...t-100_0083.jpg



no it doesn't, its a simpler design on the W123 chassis

Diseasel300 11-21-2019 12:07 PM

So much for that idea...

Alec300SD 11-21-2019 12:45 PM

Quote:

Originally Posted by Madmax55 (Post 3961457)
Should I have greased the sway bar bushings? anything else to check?

Yes. the sway bar bushings should be lubricated.

Could possibly be loose fasteners on the transmission mount, the bracket that secures
the downpipe to the transmission housing, brake caliper bolts, or wheel lug bolts.

Could also be rear sway bar links.
Just replaced these on 'Desert Rose'.
The clunk can be hard to pinpoint when in the vehicle.


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