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  #1  
Old 05-11-2011, 11:42 AM
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Axle Noise W123

Hi all. Just joined.
I have a 1980 300TD W123 and the other day driving in the country there was a noise coming from the left hand rear wheel; sort of under the car area.
The noise started after a half hour of driving at over 70mph and got louder. After stopping it seemed to go away until the same pattern was repeated. It seems to be louder when power is applied, but only after reaching the high speed. The noise then remains until I have stopped.
Theres no noise just driving around town at normal speeds. It only starts at those high speeds and after some time.
Something sounds like its whacking in there somewhere with the wheels turning. I'm guessing CV joint but suspect something else moving latterally, in and out?? The boots are old but not split yet.
Any advice would be appreciated.

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  #2  
Old 05-11-2011, 12:21 PM
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this sounds like differential noise to me.
pull the FILL plug and stick your finger in there. see how much oil is in it, and what color it is.
if it's dry, you've found the issue.
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John HAUL AWAY, OR CRUSHED CARS!!! HELP ME keep the cars out of the crusher! A/C Thread
"as I ride with my a/c on... I have fond memories of sweaty oily saturdays and spewing R12 into the air. THANKS for all you do!

My drivers:
1987 190D 2.5Turbo
1987 190D 2.5Turbo
1987 190D 2.5-5SPEED!!!

1987 300TD
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  #3  
Old 05-11-2011, 01:04 PM
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I've got a similar issue with my 79 240d. Mine only thumps when turning though.

I suspect I need to grease the CV's.

Look on youtube - there are a ton of good videos for how to inspect this area of the car.
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Old 05-11-2011, 03:00 PM
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One should not delay relubing the cv joint in question. When it is making noise it is creating damage. Delay long enough and the joint will need replacement.

Easy to add lubricant through the boot. . When the noise becomes a constant the joint will need to be replaced usually. At least the joints usually give an early warning that lubrication is needed.
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Old 05-11-2011, 03:06 PM
JB3 JB3 is offline
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take it down an empty road and swerve back and forth. If the noise is a bearing, or issue on one side or the other, it will come and go when you load and unload it.
If it stays the same, it would be diff/driveshaft/carrier bearing related. This will help you isolate where the problem is.
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Old 05-11-2011, 08:11 PM
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The time constant quoted kind of makes it a cv joint usually. Not always for certain but just usually. The joint starts to heat under harder use and starts complaining.

For the simple effort of adding lubricant will usually eliminate it as a candidate. Small amount of heavy gear oil inserted is fine for the test.
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  #7  
Old 05-11-2011, 10:42 PM
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Quote:
Originally Posted by barry123400 View Post

Easy to add lubricant through the boot.
how???
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  #8  
Old 05-11-2011, 10:52 PM
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Quote:
Originally Posted by JHZR2 View Post
how???
syringe?
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John HAUL AWAY, OR CRUSHED CARS!!! HELP ME keep the cars out of the crusher! A/C Thread
"as I ride with my a/c on... I have fond memories of sweaty oily saturdays and spewing R12 into the air. THANKS for all you do!

My drivers:
1987 190D 2.5Turbo
1987 190D 2.5Turbo
1987 190D 2.5-5SPEED!!!

1987 300TD
1987 300TD
1994GMC 2500 6.5Turbo truck... I had to put the ladder somewhere!
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  #9  
Old 05-11-2011, 10:53 PM
vstech's Avatar
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you can also fill a grease gun with the oil, and put on a needle attachment and pump it into the boot.
__________________
John HAUL AWAY, OR CRUSHED CARS!!! HELP ME keep the cars out of the crusher! A/C Thread
"as I ride with my a/c on... I have fond memories of sweaty oily saturdays and spewing R12 into the air. THANKS for all you do!

My drivers:
1987 190D 2.5Turbo
1987 190D 2.5Turbo
1987 190D 2.5-5SPEED!!!

1987 300TD
1987 300TD
1994GMC 2500 6.5Turbo truck... I had to put the ladder somewhere!
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  #10  
Old 05-12-2011, 12:10 AM
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Location: Nova Scotia, Canada.
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remove the inner boot clamp. The boot will then allow a small insertion device to add the oil between the axel and rubber boot. Do not inject oil through a small hole you make in the boot.

I have heard a turkey baster will do it as well. Very large syringe with a small rubber tube attached may be the best as already mentioned by another member.

I like the ideal of going to the druggist to ask for a syringe. I always needlessly explain that i am not a junkie. They are cheap as well. Also I use them as precision oilers on occassion as well as for critical glue injection in small spaces. Removing the very sharp point first by grinding it down. I would hate to stab myself.

If you find a boot under there that is leaking. The axle should be removed and the leaking boot changed or another axle with good boots installed.


Last edited by barry123400; 05-12-2011 at 12:20 AM.
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