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Wheel bearing comes loose

1213 Views 39 Replies 9 Participants Last post by  124.133, 
Livs313
Hello,

I have noticed that just on one wheel the bearing sometimes comes loose quite fast, I have to tighten the bearing like every week, others wheels is perfect no loose at all. Why like that?
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khomer2
You've got 4 wheels.
Pick one.

Could be the bearing carrier itself?

Any symptoms or unusual noise?
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sbaert
Bearings do not come loose by themselves. I suspect it is the wrong bearing as evidenced by the non factory grease.

Do NOT drive the car until this issue is investigated and fixed.

OR you could wait until you see one of your wheels going faster than you are and see what happens.
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H20ham
sbaert said:
Bearings do not come loose by themselves. I suspect it is the wrong bearing.
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Remove both sides and compare bearing numbers, order new incase offending one is incorrect?
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tuttebenne
When you say "comes loose" do you mean the U-shaped nut has moved - or are you saying it has not, yet there is play in the bearing that wasn't there when you last tightened it?

What is your procedure for tightening the bearing? (do you use a gauge to measure pre-load?)
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M
Appears the flat washer between the bearing and the retaining nut is missing...or am I missing something. As said before compare with the other side.
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khomer2
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Hard to see.
OP has way too much grease packed over, like a mud pie.
I guess grease works well as a barrier for coming loose issues.

OP is mia.
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H20ham
Doesnt seem like there is even a retaining nut

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plinker17722
As i see it , the retainer clamp is doing nothing ...is it even locked up tight ? no retainer clamp in the parts drawing above.On newer models may be Mercedes W124 went over to securing nuts .
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plinker17722
This is more like it looks to me like 9g is missing ..
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Livs313
there is a retaining nut, just ye, its all greased up. And what comes loose is the U shape nut. I will compare with others wheels.
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sbaert
Replacement with a new hub assembly is the only solution.
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plinker17722
Then if it is the locking yoke part number 9D and 9I will need replacing .,Try that first then if its still going loose do as sbaerts above post advised you to do .
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plinker17722
Lives check this out your self Model 124 Maintenance Manual Index in section 33-0300
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tuttebenne
McAlpine identified the problem. Has the OP implemented it yet?
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tuttebenne said:
McAlpine identified the problem. Has the OP implemented it yet?
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It looks like the washer is there. Livs313 confirmed it.
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Livs313
I can't find OEM part numbers for 9d and 9i, where could I find them?
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tuttebenne said:
McAlpine identified the problem. Has the OP implemented it yet?
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Yes I have 9g there, just hard to see in original photo.
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sbaert
The answer is in post #12
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sbaert said:
The answer is in post #12
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Just for clarification, are you saying the whole hub needs to be replaced? Is there any reason why new bearings and races can't be installed in the old hub?
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sbaert
Based on the pic, it looks like the bearings were already replaced before.
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