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Old 11-23-2017, 12:34 PM   #1
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Default Is this a bad thrust bearing?

I picked up a 2006 416CDI 4x4 in Europe and am driving it 3000km home. Everything seems to be running well and all is smooth while driving on the highway. No heat problems etc. However, when the van is sitting at idle I can hear a noise underneath that sounds like something rotating and has a sound like a galloping horse (if I can use that comparison?). It doesn't sound like it's destroying anything, but does sound like it's probably not ideal. As soon as I push the clutch in, the sound disappears. When I take my foot back off the clutch, the sound reappears again. I don't really have any mechanical experience but over the phone my old man told me it could be a thrust bearing?

Any ideas guys? Sounds expensive? I've done 1500km and am halfway home
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Old 11-23-2017, 01:17 PM   #2
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Default Re: Is this a bad thrust bearing?

Your old man is correct. Sounds like a thrust bearing, if it seizes it will do damage, but if you don't idle with the clutch depressed it will last longer. I am not familiar with T1N manual transmissions, but on a regular transmission pulling the thrust and changing it means pulling the trans, so while you are in there you do the clutch as well, unless it is very healthy. Sometimes the PO changed a clutch and saved some $ by not changing the TB . It's a gamble to continue, basically all time spent with the clutch depressed is wearing thealready failing bearing. This can be mitigated by coasting in neutral, idling in neutral. Personally if I was on a long trip, I would limp to the nearest, recommended transmission shop and have it changed. Cause if it seizes it'll cost more.
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Old 11-23-2017, 01:27 PM   #3
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Default Re: Is this a bad thrust bearing?

Wanted
Well it could be expensive.
Remember the clutch is connected to the gearbox input shaft, which in turn is connected to the layshaft permanently inside the box.
When you disconnect the clutch the whole lot stop whirring around so it might conceivably be something n the box as well.
Or in fact clutch itself rattling on the input shaft splines.
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Old 11-23-2017, 01:45 PM   #4
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Default Re: Is this a bad thrust bearing?

Just realized I read that wrong... the noise is at idle with the clutch engaged(no foot on clutch pedal)? If that is the case not thrust bearing, that makes noise when the clutch pedal is depressed.
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Old 11-23-2017, 01:53 PM   #5
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Default Re: Is this a bad thrust bearing?

Yeah I am not sure, when I take my foot off of the pedal, the noise starts. When I push the pedal in the noise goes away. I don't know if it's happening while I'm driving down the highway because the noise of the engine is probably masking it. I just see dollar signs - __-'

Just from reading online, it could be the input shaft bearing. It seems to be a bit of an argument online whether it is the thrust bearing or input shaft bearing, as people can't agree on which one makes the noise when the clutch is engaged (pedal out)

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Old 11-23-2017, 02:22 PM   #6
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Default Re: Is this a bad thrust bearing?

Wanted,

The first thing I would do is check the gearbox oil level, there is a plug on the side and the oil level should be just at the bottom of of the hole.

Also while you are under there look for any signs of oil leaks or debris in or around the bellhousing.

If you just ever so gently press the clutch does the noise stop? Or do you have to press the clutch all the way to fully disconnect the engine from the gearbox?

Keith.
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Old 11-23-2017, 05:07 PM   #7
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Default Re: Is this a bad thrust bearing?

Worth a check of the harmonic balance. A loose outer ring can rub against stuff and sound like that. I don't know why it would stop with the clutch.
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Old 11-23-2017, 05:50 PM   #8
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Default Re: Is this a bad thrust bearing?

Quote:
Originally Posted by Cheyenne View Post
Wanted,

The first thing I would do is check the gearbox oil level, there is a plug on the side and the oil level should be just at the bottom of of the hole.

Also while you are under there look for any signs of oil leaks or debris in or around the bellhousing.

If you just ever so gently press the clutch does the noise stop? Or do you have to press the clutch all the way to fully disconnect the engine from the gearbox?

Keith.
Hey Keith, thanks for the message. I jumped under and took a look, I can't see any sign of a leak around the bell housing. I'm in transit between Denmark and Spain at the moment so don't have any tools or anything, can't get in to check the gearbox oil. I took a photo of the area here;

http://oi67.tinypic.com/34ywun8.jpg

I drew a red circle from around where the noise was coming from, I don't know where the gearbox oil plug is but I'm guessing it is the one in the picture that is inside the same red circle.

If I ever so gently press in the clutch, it sounds like it speeds up slightly or adds an extra rattle until the clutch pedal is fully pressed in, and the sound disappears completely.

I have 1,500km until I arrive to Madrid and I don't need to drive it anymore, in fact I intend to strip most of it back to bare bones in order to prep it for a conversion and I'll replace any bearings, bushings, ball joints and tidy up everything underneath anyway. Do you think I should continue on the 1500km to Madrid, or is it critical and will lead to something catastrophic if not fixed immediately. I guess it's worth noting that I first noticed the noise when I first left Denmark, 1500km ago.
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Old 11-23-2017, 06:18 PM   #9
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Default Re: Is this a bad thrust bearing?

My advise is to get the level checked maybe drain the oil and look for metal!
If there are no chunks then carry on.
As inspiration I drove in me younger yurs a 1956 Morris Minor from Gloucester to Lille and then to Beziers to collect and tow a Citroen 2CV back to Lille with a noisy gearbox and with No 1st or reverse gear!
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Old 11-24-2017, 01:33 AM   #10
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Default Re: Is this a bad thrust bearing?

Adding to what Dennis says, if it makes more noise in neutral, stay out of neutral. That may help get you there. It's the opposite with a bad thrust bearing, you try to stay in neutral and away from the clutch.
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