cluch noise

Submitted: Monday, Jan 17, 2005 at 21:23
ThreadID: 19543 Views:1404 Replies:5 FollowUps:3
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hi all can someone tell me what could be a problem ,ok 1999 landcruiser petrol and gas done 140.000ks and just noticed a noise while the cruiser is in neutral the seem to be a sort of winding noise when you put your foot on the cluch it goes away it might a thrust bearing , dont know the cluch dose not slip or shutter at all hope some can help thanks.
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Reply By: cokeaddict - Monday, Jan 17, 2005 at 21:39

Monday, Jan 17, 2005 at 21:39
Could be the thrust brg, also consider the input brg too. When in neutral it still spins with the engine rpm. Also can be other factors too but they seem to be the most common.
Ange
AnswerID: 93671

Reply By: Bilbo - Tuesday, Jan 18, 2005 at 00:12

Tuesday, Jan 18, 2005 at 00:12
Odds on - it's the primary shaft bearing at the front of the gearbox. This shaft spins even when you're in neutral, no gear selected and your foot is OFF the clutch pedal. However, it stops spinning when you depress the clutch pedal.

Next best bet - IF there is a needle roller bearing located in the primary shaft where it meets the main drive shaft that supports the 'fat' end of the primary shaft, it could the needle roller bearing. But doubtful - needle bearings generally don't whine and they are nowhere as big as the primary shaft bearing.

Next,next,best bet - IF there is a needle roller bearing located in the flywheel that supports the 'thin' end of the primary shaft, it could the needle roller bearing. But doubtful.

Next,next,next best bet - I don't reckon it's the clutch thrust bearing. This bearing is stationary when your foot is OFF the clutch pedal. It only rotates when your the clutch pedal is depressed. Unless it's been adjusted up really tight to the clutch pressure plate thrust pad. (Unusual for this to be the case)

All of this must be as "depressing" as the clutch pedal itself - 'cos to fix the noise, the gearbox has to come out and it's usual to replace all bearings whilst the box is out - oh and put a new clutch in.

Bilbo
AnswerID: 93702

Follow Up By: rig pig - Tuesday, Jan 18, 2005 at 03:08

Tuesday, Jan 18, 2005 at 03:08
Next,next,best bet - IF there is a needle roller bearing located in the flywheel that supports the 'thin' end of the primary shaft, it could the needle roller bearing. But doubtful.

Bilbo,

This bearing doesn't turn with the clutch out, so hence it won't make a noise
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FollowupID: 352679

Follow Up By: stans truck - Tuesday, Jan 18, 2005 at 11:02

Tuesday, Jan 18, 2005 at 11:02
thanks for your input bilbo what would happen if say you were in the desert and this sharft bearing let go are you stuck or is one of those things just keep making noise for ever and keep giong.
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FollowupID: 352722

Reply By: rig pig - Tuesday, Jan 18, 2005 at 03:09

Tuesday, Jan 18, 2005 at 03:09
All gears spin when clutch is out in neutral except the reverse idler. It could be bearings or it could be just a gear whine, has this noise just started your have you just noticed it. When driving is the noise there through all the gears except 4th. For an easy solution on diagnosing the prob just go to a few work shops and get a quote.
AnswerID: 93712

Follow Up By: stans truck - Tuesday, Jan 18, 2005 at 10:55

Tuesday, Jan 18, 2005 at 10:55
thanks guys for your input,rig pig answer to your question noise just started while you drive no noise at all through all the gears only in neutral only .
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FollowupID: 352719

Reply By: 80scruiser - Tuesday, Jan 18, 2005 at 12:42

Tuesday, Jan 18, 2005 at 12:42
Wash a drain tin out and drain the gearbox oil into it. If the input bearing is noisy there should be a silvery tinge to the oil.
AnswerID: 93756

Reply By: Nino & Kerry- Wednesday, Jan 19, 2005 at 12:20

Wednesday, Jan 19, 2005 at 12:20
Hi mate,
I can't help but think that other posts are looking to deep to early.Bottom line is you have a noise that needs to be fixed. I think that it's just your thrust bearing. If you don,t do anything it will let go, you just can,t pick when or where.
My advice (for what its worth) remove the gearbox and inspect the thrust BRG.It will be obvious if it has dryed out/worn/failed. If it is OK then look further then. If its shot, Fit a new clutch kit and you,re away.
If you are unable to do the work yourself Make sure that you tell the repairer not to proceed to the next step without your OK.
Cheers Nino.
AnswerID: 93912

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