Noisy Diff

Polly · 17th December 2015, 15:31

Anyone actually experienced a noisy 260 transmission? How do you determine you have a noisy diff, as opposed to the other possible causes of transmission noise?

colin39 · 17th December 2015, 16:28

Check ya tyres arnt distorted, move front to rear.if the noise is at 40mph its more likely a bearing on a wheel.

mh007 · 17th December 2015, 17:33

Is the noise in all gears or a particular gear ?

The original diff oil was supposed to be changed after around 1,500mls if I remember correctly.

I changed mine as soon as I got the car (when I carried out the service).

itcaptainslow · 17th December 2015, 17:40

Clunking when taking power as long as it's not excessive is normal. It's worth changing the oil if you don't know when it was last done.

colin39 · 17th December 2015, 18:00

Quote:

Originally Posted by mh007

Is the noise in all gears or a particular gear ?

The original diff oil was supposed to be changed after around 1,500mls if I remember correctly.

I changed mine as soon as I got the car (when I carried out the service).

1,500? Or 15,000?

mh007 · 17th December 2015, 18:25

Quote:

Originally Posted by colin39

1,500? Or 15,000?

The original oil in the diff was "running in" oil so I'm sure that 1,500mls was correct.

sjr · 17th December 2015, 18:36

The oil change was early, I think it may even have been 1000 miles.

SJR

AndyG · 17th December 2015, 18:39

TADIS.

Changing Oil can help,

A different gear change/clutch/throttle operation can also help.

Polly · 17th December 2015, 18:46

Ok, thanks for quick replies, I can confirm tyres are new (it's a 260&#128512

and the diff oil has been changed. Wheel bearing would be a possibility, and it is virtually impossible to check them by hand due to the high diff resistance, but noise does not alter during cornering. Because the noise is purely speed related, and doesn't alter on power or over run, nor coasting in neutral, I would be inclined to think it might be the prop shaft centre bearing, but these cars did have a noisy diff issue, so how do you identify which is at fault?

murphyv310 · 17th December 2015, 18:50

Noisy RWD diffs usually make a hissing noise after a good few miles, mostly due to the "input" bearing.
Oil level is important for this bearing as they are splash lubricated, too low = inadequate lube.

17th December 2015, 18:50	#10
murphyv310 This is my second home Hyundai i10 998cc Join Date: Mar 2012 Location: Kilmarnock Posts: 6,602 Thanks: 2,088 Thanked 2,298 Times in 1,349 Posts	Noisy RWD diffs usually make a hissing noise after a good few miles, mostly due to the "input" bearing. Oil level is important for this bearing as they are splash lubricated, too low = inadequate lube. __________________ Cheers from Trevor MM0KJJ

17th December 2015, 15:31	#1
Polly Posted a thing or two MG ZT 260 SE, ZS120, ZR105 Join Date: Mar 2014 Location: Peterhead Posts: 1,375 Thanks: 203 Thanked 350 Times in 241 Posts	Noisy Diff Anyone actually experienced a noisy 260 transmission? How do you determine you have a noisy diff, as opposed to the other possible causes of transmission noise?

17th December 2015, 16:28	#2
colin39 Regular poster none at the moment Join Date: Aug 2015 Location: canvey y-uk Posts: 81 Thanks: 6 Thanked 6 Times in 6 Posts	Check ya tyres arnt distorted, move front to rear.if the noise is at 40mph its more likely a bearing on a wheel.

17th December 2015, 17:33	#3
mh007 This is my second home MG ZT260 SE, MG ZT190+, MG ZTT 160, R75 Conn SE 2.0, R75 Conn SE 2.5 X 3, R75 Club SE 1.8, P5B Coupe Join Date: Jul 2009 Location: Keynsham, Bristol Posts: 4,211 Thanks: 65 Thanked 635 Times in 499 Posts	Is the noise in all gears or a particular gear ? The original diff oil was supposed to be changed after around 1,500mls if I remember correctly. I changed mine as soon as I got the car (when I carried out the service).

17th December 2015, 17:40	#4
itcaptainslow Avid contributor 200Vi & 214 SEi Join Date: Jul 2015 Location: Letchworth Posts: 196 Thanks: 36 Thanked 63 Times in 40 Posts	Clunking when taking power as long as it's not excessive is normal. It's worth changing the oil if you don't know when it was last done.

17th December 2015, 18:36	#7
sjr Avid contributor MG ZT 260 & Ford Mustang 5.0 GT Join Date: May 2009 Location: Uxbridge Posts: 208 Thanks: 1 Thanked 17 Times in 12 Posts	The oil change was early, I think it may even have been 1000 miles. SJR

17th December 2015, 18:39	#8
AndyG Passed Away MG ZTT400 SHM Join Date: Mar 2007 Location: Exeter Posts: 273 Thanks: 4 Thanked 54 Times in 43 Posts	TADIS. Changing Oil can help, A different gear change/clutch/throttle operation can also help.

17th December 2015, 18:46	#9
Polly Posted a thing or two MG ZT 260 SE, ZS120, ZR105 Join Date: Mar 2014 Location: Peterhead Posts: 1,375 Thanks: 203 Thanked 350 Times in 241 Posts	Ok, thanks for quick replies, I can confirm tyres are new (it's a 260&#128512 and the diff oil has been changed. Wheel bearing would be a possibility, and it is virtually impossible to check them by hand due to the high diff resistance, but noise does not alter during cornering. Because the noise is purely speed related, and doesn't alter on power or over run, nor coasting in neutral, I would be inclined to think it might be the prop shaft centre bearing, but these cars did have a noisy diff issue, so how do you identify which is at fault?