261 replies to this topic

[Tonylamb]

Clutch release bearing? It does rattle when you are going along but it's so loud it's hard to tell if it's the same.

[nicklouse]

Clutch release bearing? It does rattle when you are going along but it's so loud it's hard to tell if it's the same.

then i would be seriously looking at the release bearing as that rattle if the idler gear will shut up under load.

 

the shutting up with the clutch pedal depressed is normally the release bearing but also will shut up the gears as you are removing the drive to them.

 

you said earlier that it is not the release bearing why are you thinking this

[Tonylamb]

I don't know why I said that to be honest. I always imagined a release bearing to whine like a wheel bearing does. Plus I've had a dodgy release bearing on a car before. This noise isn't like a bearing sound if that makes sense. Its more of a clattering rattling sound. Almost like something in the clutch or gear box is loose and is clipping something as it rotates. I was thinking that perhaps a bit of the clutch was sticking out and tapping the clutch housing or something. perhaps a loose bolt. clutch because it stops when you depress the pedal. Also you can hear the release bearing whine when you depress the clutch but the clattering sound stops??? But as you say depressing the clutch also disengages the gears so it could be something in there? I spoke to my engine builder and he checked all the clearances and says that when he ran the engine it didn't make that noise. So its presumably something that has happened since the engine was loaded up in the car. All a bit of a mystery and as I spent a good amount of hard earned on it I don't see any choice but to take it out and take a look in the clutch housing for starters.

[Steve220]

Doesn't sound release bearing to me, theyre not exactly the largest thing in the world. If its your primary gear, you'll have a large pool of oil being left under the O/S of the car. My guess is idler, which unfortunately (for an easier solution) is engine out.

[nicklouse]

I don't know why I said that to be honest. I always imagined a release bearing to whine like a wheel bearing does. Plus I've had a dodgy release bearing on a car before. This noise isn't like a bearing sound if that makes sense. Its more of a clattering rattling sound. Almost like something in the clutch or gear box is loose and is clipping something as it rotates. I was thinking that perhaps a bit of the clutch was sticking out and tapping the clutch housing or something. perhaps a loose bolt. clutch because it stops when you depress the pedal. Also you can hear the release bearing whine when you depress the clutch but the clattering sound stops??? But as you say depressing the clutch also disengages the gears so it could be something in there? I spoke to my engine builder and he checked all the clearances and says that when he ran the engine it didn't make that noise. So its presumably something that has happened since the engine was loaded up in the car. All a bit of a mystery and as I spent a good amount of hard earned on it I don't see any choice but to take it out and take a look in the clutch housing for starters.

the release can make a similar noise. but it is as i said before more like the idler.

 

next thing to do is raise the revs a bit and see if it smother out the revs and shuts up the rattle. and get someone to hands on look.

[Steve220]

Also try getting a long handled screwdriver and put the tip on different places and the handle on your ear, you'll hear it prominently from the area its making the rattling.

[Tonylamb]

revving the engine doesn't seem to make any real difference to the rattle. Its still there. I'll try a long screwdriver for listening but its definately coming from the clutch end of the engine. All very odd. I'm off on a business trip but will take the engine out when I get back. I'll let everyone know what happens.

[Tonylamb]

So I tried the screwdriver to listen but it's not overly obvious where the noise is directly coming from. I've tried to take another video. Ignore the end forgot to turn the video off LOL. There is a bearing type noise that goes away with the clutch depressed. Also the rattle does seem to go somewhat as you put a few revs on. Still think the engine will have to come out. But any more thoughts appreciated. Frankly it's got to be either the idler gear or the clutch release bearing. If it's the idler I dont want it to wreck the bearing housing.

[Tonylamb]

Forgot the link

https://youtu.be/8cH-bpJ9yeA

[imack]

I wouldn't worry too much about the whirring bearing type noise, I think you'll find it's just the noise of the straight cut gear set turning when the clutch is engaged. The release bearing shouldn't be turning when the clutch is engaged if the clearance at the release arm is correct.
My straight cut box makes exactly the same whirring noise until you disengage the clutch.
The rattle sounds like idler gear to me though.

[Tonylamb]

So whilst I think the engine does have to come out I thought I would readjust the clutch clearances and see if it made a difference to the dreaded rattle. It does, its much worse LOL. I took a quick video. the rattle does seem to stop when the revs rise and it goes away completely when the clutch is depressed. its most odd. As you can probably hear it doesn't sound like a bearing more like something "Clattering" or "Chattering". And it would seem to be definately the clutch end of the car. It also seems to have a bearing noise when driving along which I suspect is a wheel bearing. Don't know why because they are both new???

https://youtu.be/WxdpSGvQE4g

[imack]

What cam are you running and what idle speed? Idle sounds quite low.

[Tonylamb]

It's just a fast road cam and the idle is a about 1100 there was a bit of choke in the video.

[Tonylamb]

I've got most of the ancillary bits off the engine water drained etc. Just need to Jack up remove drive shafts exhaust etc. I did notice that the flywheel teeth have some very minor damage from the starter motor teeth. I dont suppose the starter could be the source of the rattle. But then why would it stop with the clutch depressed. The fly wheel cant move back and forth?

[johnR]

It could if the crank thrusts are worn?

Edited by johnR, 02 May 2019 - 09:43 AM.