Differential Noise?

SydneyRoverP6B

SydneyRoverP6B

Well-Known Member
Staff member
My Rover's differential and pinion extension case remain original, save for the two drive shafts which I replaced 20 odd years ago due. My reason for their replacement was both as a precaution but more so due to a leaking oil seal. As a unit, it has now travelled more than 373,000 miles (over 600,000km).

In the last few years though I have noticed what I originally considered to be a slight whine audible whilst coasting. Now the sound is also audible with engine load, although only at lower speeds. I can detect no vibration or any other cause for concern. There are no oil leaks. Thoughts?


Ron.
 
1. Turn up the radio
2.Use thicker oil, I use EP140 Hypoid in a noisy diff in my cobra.
3. Try Molyslip additive as well.
4. Will probably go many more thousand miles yet so don't panic.
 
When were your UJs last done? Do these as well as the diff. Lots of drivetrain mysteries tend to vanish when these are replaced.
 
I'm using this in my VW Kombi transaxle with good results. Nulon G70
b_41.jpg

Craig
 
cobraboy said:
1. Turn up the radio
2.Use thicker oil, I use EP140 Hypoid in a noisy diff in my cobra.
3. Try Molyslip additive as well.
4. Will probably go many more thousand miles yet so don't panic.
Click to expand...

Lol turn up the radio, that is why cars have them :D
A more viscous oil might do the trick, something to think about.
I am sure it will indeed go for many more miles before I need to remove and replace.

Ron.
 
PeterZRH said:
When were your UJs last done? Do these as well as the diff. Lots of drivetrain mysteries tend to vanish when these are replaced.
Click to expand...

Hi Peter,

Some not too long ago. The tailshaft uni joints have been in for 11 years and have covered some 170,000 miles (274,000km), so they are certainly the longest. They have nipples and I grease them every 2000 miles or so, but I am not sure.... The noise certainly appears to be coming from down the back. I know for certain it is not the hub bearings. I'll take the tailshaft out in the next month or so and make sure.

Ron.
 
Craig[/QUOTE]
74westy said:
I'm using this in my VW Kombi transaxle with good results. Nulon G70
b_41.jpg



Hi Craig,

I have used the Nulon additive in my Rover's differential since the late 1980s. I have typically changed the oil every 20 to 40,000 miles, then added a tube of Nulon. It may have extended the running life, although I will never know for certain.

Ron.
Click to expand...
 
Well the problem has been solved. I removed the n/s half shaft on Saturday, fitting a spare shaft complete with two new universal joints that I had fitted. The shaft that I removed required replacement of both universal joints. I knew this was the case as I could hear the clicking and crunching when driving very slowly, and when applying the brakes. These noises becoming evident over the last few weeks, well after the whine had began. What I had not expected though was the hub bearing is also in need of replacement. I could feel pitting when turning the hub slowly. The worn hub bearing was responsible for the noise, not the differential.

After fitting the replacement half shaft, the whine has disappeared, an outcome I am extremely pleased about! :D

Ron.
 
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