5th-gear noise?!

SLK · 1st February 2006, 17:55

Quote:

Originally Posted by Sideways

Ask him to try and change the release bearing and see if the noise goes away. If it still persists you might have to change the bearing on the main shaft. I don't think it has anything to do with the 5th cog.

you mean the CRB? (Clutch Release Bearing).. no, I am sure that its not that sound!!,, b'coz my wagonR has a seperate sound for that

And My 800 has a brand new clutch assembly.

ghostrider4385 · 1st February 2006, 18:26

To Zappo: No, there is no screeching noise of a belt slippage. This noise is distinctly audible, and defiantly doesn't sound like any belt slippage. It comes when the car is idling in neutral. And NO, I NEVER rev the car with the engine cold.
I have a 2003 zan mpfi, so no tach.

Godspeed.

Alok.

ghostrider4385 · 1st February 2006, 18:34

To SLK & sideways: Mind telling me more about the role of this CRB and what happens to it to make this noise?

Godspeed.

Alok.

SLK · 1st February 2006, 21:37

The CRB.. makes a different .. noise... a "shhhhhhhhhh"... kind of thing.
the CRB ONLY comes into play when you press the clutch pedal... otherwise its not in use and thus not rotating.
To check the CRB sound you just need to press the clutch to a point it starts to release...

My wagonR's CRB was damaged long time back.. when I had to slip my clutch through a water logged area.... probably water reached my bearing and rusted it.

I think the bearing costs a few hundred rupees..... And replacing the clutch is a 5k job. It doesn't make sense to open up the bearing and not replace the clutch ... as there is a lot of labour cost involved in opening till that point. (So I am running a bad bearing for the last 15-20k kms)

This gearbox sound is more like a big lose bolt vibrating... and not anything like a bearing.

ghostrider4385 · 2nd February 2006, 12:26

hey, I was paying more attention to that noise again. I think you right SLK, about the oil taking time to reach the 5th gear. The noise slowly reduced when the engine was warming up. When it reached it's normal temperature, the noise stopped. And I think I know what you mean by CRB noise, and I know this was'nt it. Thanks a heap though man.

Godspeed.

Alok.

Sideways · 2nd February 2006, 13:30

Just ask him if it is the bearing in the main shaft. i have a feeling it might be the cause for the noise, now that we have ruled out the CRB.

ghostrider4385 · 2nd February 2006, 13:41

To Sideways: Ye, will do. I need to go there soon anyway. Have to change my driver side seat lock... squeaks like hell when you sit in it and move around. And those chaps forgot to put the door handle's screw plugs back on when they changed my mal-functioning driver side door lock (I have a feeling the autocop which I used caused this). The locking switch just broke! Did autocop's security system do this to anyone else's car door too?!

Godspeed.

Alok.

Sideways · 2nd February 2006, 13:49

another way of checking the main shaft bearing is to drive the car in 4th gear at 30 to 40 kmph, then accelerate gently and see if you get the same noise.

ghostrider4385 · 2nd February 2006, 15:15

To sideways: No. No noise comes when I am in any gear. Anyway, I think it's just what SLK had said. It only comes when the engine is warming up.

Godspeed.

Alok.

adit1329 · 2nd February 2006, 21:03

Quote:

Originally Posted by Zappo

As I said, the car autorevs but in a controlled fashion. The ECU takes care of that. The revs go up slowly. There are so many sensors built in to monitor the vital stats of the modern car.

So do not worry on the autorev part. ECU knows the best about your car. Just do not add your own inputs (thru accl pedals).

the autorev is the ecu kicking in (for cold start/ first starts) as the mpfi engine does not have a choke and also i have noticed in most mpfi engine car owners, they end to press the accelerator pedal while starting inspite of warning stickers in the car not to press the accelerator pedal while starting

kylohere · 7th February 2006, 00:07

Quote:

Originally Posted by Sideways

Ask him to try and change the release bearing and see if the noise goes away. If it still persists you might have to change the bearing on the main shaft. I don't think it has anything to do with the 5th cog.

If it was a worn release bearing, the sound would be constantly emitting when the clutch pedal isnt depressed, irrespective of the engine temperature or rpm. Thats becoz it doesnt get any lubrication from the engine pump. infact there isnt any lubrication system apart from the manual application of grease when the clutch assembly is assembled or plates replaced.

The fifth gear noise is a common problem with maruti cars. Its becoz of the inadequate supply of oil to the fifth gear. The noise is more prominent when the engine is cold and started after a few hours becoz it takes some time for the oil which has settled at the bottom of the gearbox to get circulated around. Dont worry, u'll also notice a grating sound when u shift to reverse. This is becoz most maruti cars have a sliding mesh reverse gear.

Regards,
Kylo.

1st February 2006, 18:26	#17
ghostrider4385 BHPian Join Date: Dec 2005 Location: Hyderabad Posts: 389 Thanked: 12 Times	To Zappo: No, there is no screeching noise of a belt slippage. This noise is distinctly audible, and defiantly doesn't sound like any belt slippage. It comes when the car is idling in neutral. And NO, I NEVER rev the car with the engine cold. I have a 2003 zan mpfi, so no tach. Godspeed. Alok.
	() Thanks

1st February 2006, 18:34	#18
ghostrider4385 BHPian Join Date: Dec 2005 Location: Hyderabad Posts: 389 Thanked: 12 Times	To SLK & sideways: Mind telling me more about the role of this CRB and what happens to it to make this noise? Godspeed. Alok.
	() Thanks

1st February 2006, 21:37	#19
SLK Senior - BHPian Join Date: Feb 2004 Location: Nomad Posts: 1,801 Thanked: 1,421 Times	The CRB.. makes a different .. noise... a "shhhhhhhhhh"... kind of thing. the CRB ONLY comes into play when you press the clutch pedal... otherwise its not in use and thus not rotating. To check the CRB sound you just need to press the clutch to a point it starts to release... My wagonR's CRB was damaged long time back.. when I had to slip my clutch through a water logged area.... probably water reached my bearing and rusted it. I think the bearing costs a few hundred rupees..... And replacing the clutch is a 5k job. It doesn't make sense to open up the bearing and not replace the clutch ... as there is a lot of labour cost involved in opening till that point. (So I am running a bad bearing for the last 15-20k kms) This gearbox sound is more like a big lose bolt vibrating... and not anything like a bearing.
	() Thanks

2nd February 2006, 12:26	#20
ghostrider4385 BHPian Join Date: Dec 2005 Location: Hyderabad Posts: 389 Thanked: 12 Times	hey, I was paying more attention to that noise again. I think you right SLK, about the oil taking time to reach the 5th gear. The noise slowly reduced when the engine was warming up. When it reached it's normal temperature, the noise stopped. And I think I know what you mean by CRB noise, and I know this was'nt it. Thanks a heap though man. Godspeed. Alok.
	() Thanks

2nd February 2006, 13:30	#21
Sideways BHPian Join Date: Nov 2004 Location: Madras - India Posts: 640 Thanked: 32 Times View My Garage	Just ask him if it is the bearing in the main shaft. i have a feeling it might be the cause for the noise, now that we have ruled out the CRB.
	() Thanks

2nd February 2006, 13:41	#22
ghostrider4385 BHPian Join Date: Dec 2005 Location: Hyderabad Posts: 389 Thanked: 12 Times	To Sideways: Ye, will do. I need to go there soon anyway. Have to change my driver side seat lock... squeaks like hell when you sit in it and move around. And those chaps forgot to put the door handle's screw plugs back on when they changed my mal-functioning driver side door lock (I have a feeling the autocop which I used caused this). The locking switch just broke! Did autocop's security system do this to anyone else's car door too?! Godspeed. Alok.
	() Thanks

2nd February 2006, 13:49	#23
Sideways BHPian Join Date: Nov 2004 Location: Madras - India Posts: 640 Thanked: 32 Times View My Garage	another way of checking the main shaft bearing is to drive the car in 4th gear at 30 to 40 kmph, then accelerate gently and see if you get the same noise.
	() Thanks

2nd February 2006, 15:15	#24
ghostrider4385 BHPian Join Date: Dec 2005 Location: Hyderabad Posts: 389 Thanked: 12 Times	To sideways: No. No noise comes when I am in any gear. Anyway, I think it's just what SLK had said. It only comes when the engine is warming up. Godspeed. Alok.
	() Thanks