Rattle from the gearbox......

baconbuttyman · 28th September 2010, 16:18

just had the RAC man out to the car, there is a slight rattle coming from the gear box, he seems to think its the lay gear, what is this and is it serious

thanx guys

Phil · 28th September 2010, 16:57

Is it at idle and in neutral, does putting your foot fully on the clutch stop it? If so does slight pressure on the clutch pedal change the pitch?

baconbuttyman · 28th September 2010, 20:32

inneutral, the noise is there, when the clutch is depressed it disapears

Phil · 29th September 2010, 19:53

Ok, what about if you take up the first half inch of free play on the clutch pedal?

baconbuttyman · 5th October 2010, 12:42

so younare saying it could be free play in the pedal

is it worth changing the gear oil, if so which is best

COLVERT · 5th October 2010, 20:49

Could easily be crankshaft end float. ie. Slight wear in the crank thrust bearings. Will go away with pressure on the clutch pedal cos this pushes the crankshaft in the direction of the crankshaft pulley.
Can be slightly annoying but rarely causes any problem other than a light knock.

Colvert.

COLVERT · 5th October 2010, 20:55

Quote:

Originally Posted by baconbuttyman

inneutral, the noise is there, when the clutch is depressed it disapears

If the noise is coming from the gearbox then the reason it goes away when you push the clutch pedal down is that the innards of the gearbox stop revolving. Also my post above is relevant.

Colvert.

Phil · 5th October 2010, 21:01

Quote:

Originally Posted by baconbuttyman

so younare saying it could be free play in the pedal

is it worth changing the gear oil, if so which is best

Hello Mick, the reason for taking the freeplay out of the pedal is it loads the release bearing but doesn't stop the gearbox from spinning.

kraanc · 12th November 2012, 07:22

Hi. I have the same problem. i can hear light rattle at gearbox, and have pedal freeplay also. How do you take out freeplay?

mh007 · 12th November 2012, 10:13

The whole idea of taking up the free-play on the clutch pedal is just to try and eliminate certain areas.
The Layshaft/Gear will rattle when the car is idling in Neutral & the noise will disappear when the clutch is depressed (if there is wear apparent)
If the noise is still there when the clutch is depressed, it's not Layshaft/Gear related & may possibly be clutch release bearing.
Incidently, Dual Mass Flywheels (DMF) can also rattle when they are worn.
I've had gearboxes go on for ages with Layshaft/Gear rattles without problem, just more of an annoyance.
It would be an idea to check the gearbox oil level.
Trying to permanently take out the free-play in the clutch pedal will not cure the problem & is not recommended.

28th September 2010, 16:18	#1
baconbuttyman Banned Join Date: May 2009 Posts: 5,724 Thanks: 0 Thanked 9 Times in 7 Posts	Rattle from the gearbox...... just had the RAC man out to the car, there is a slight rattle coming from the gear box, he seems to think its the lay gear, what is this and is it serious thanx guys Last edited by baconbuttyman; 28th September 2010 at 16:35..

28th September 2010, 16:57	#2
Phil This is my second home Rover 75 CDT Connoisseur SE Join Date: Nov 2006 Location: Wales Posts: 12,227 Thanks: 469 Thanked 523 Times in 241 Posts	Is it at idle and in neutral, does putting your foot fully on the clutch stop it? If so does slight pressure on the clutch pedal change the pitch? __________________

29th September 2010, 19:53	#4
Phil This is my second home Rover 75 CDT Connoisseur SE Join Date: Nov 2006 Location: Wales Posts: 12,227 Thanks: 469 Thanked 523 Times in 241 Posts	Ok, what about if you take up the first half inch of free play on the clutch pedal? __________________

12th November 2012, 10:13	#10
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	The whole idea of taking up the free-play on the clutch pedal is just to try and eliminate certain areas. The Layshaft/Gear will rattle when the car is idling in Neutral & the noise will disappear when the clutch is depressed (if there is wear apparent) If the noise is still there when the clutch is depressed, it's not Layshaft/Gear related & may possibly be clutch release bearing. Incidently, Dual Mass Flywheels (DMF) can also rattle when they are worn. I've had gearboxes go on for ages with Layshaft/Gear rattles without problem, just more of an annoyance. It would be an idea to check the gearbox oil level. Trying to permanently take out the free-play in the clutch pedal will not cure the problem & is not recommended. Last edited by mh007; 12th November 2012 at 10:19..

28th September 2010, 20:32	#3
baconbuttyman Banned Join Date: May 2009 Posts: 5,724 Thanks: 0 Thanked 9 Times in 7 Posts	inneutral, the noise is there, when the clutch is depressed it disapears

5th October 2010, 12:42	#5
baconbuttyman Banned Join Date: May 2009 Posts: 5,724 Thanks: 0 Thanked 9 Times in 7 Posts	so younare saying it could be free play in the pedal is it worth changing the gear oil, if so which is best

5th October 2010, 20:49	#6
COLVERT This is my second home R75 Saloon. Join Date: Feb 2009 Location: France/or Devon. Posts: 14,003 Thanks: 3,851 Thanked 2,167 Times in 1,816 Posts	Could easily be crankshaft end float. ie. Slight wear in the crank thrust bearings. Will go away with pressure on the clutch pedal cos this pushes the crankshaft in the direction of the crankshaft pulley. Can be slightly annoying but rarely causes any problem other than a light knock. Colvert.

12th November 2012, 07:22	#9
kraanc Loves to post MG ZT-T 190 2.5 V6 2003 manual Join Date: Oct 2011 Location: Riga Posts: 349 Thanks: 49 Thanked 14 Times in 11 Posts	Hi. I have the same problem. i can hear light rattle at gearbox, and have pedal freeplay also. How do you take out freeplay?