1998 UK Turbo.

Has what appears to be a gear lash type Wooo, WOoooo noise mainly in 3rd on overrun @ low engine speed & especially down hill whilst off throttle Etc.

I thought it might be the Diff as you can here it faintly (but not all the time) in other gears, But put it in third down hill off throttle @ the right Engine speed & it talks back to you like a nagging Passenger
Surely if it was the Diff you would hear it clearly in all gears @ a similar engine speed ?

Any ideas as to the cause of this ??
Which bearing, Gear Etc ??
Defo not a wheel bearing & there is a good 1/4" Backlash/Rotation on the prop when you turn it

Many thanks

Dean

 

Bump

 

Following on from this
https://www.scoobynet.com/general-te...ine-speed.html

Well it's not just 3rd gear, It can be heard in 4th & 5th Also !!

So i had a colleague listen also & he thought Diff.
So Swapped the Diff out & Just the Bloody Same

Went for a run last night, With windows down Utilising buildings & hedgerows to bounce the sound back & it is definately coming from the Rear N/s Hub area.
If i Dab the handbrake on it stops, Release & it starts again ??
Dab the foot brake & it does not change ??

Thoughts Please ??
It does not become very audiable until it's got some heat in it !!

Wheel bearing ?? Handbrake loading it up & stopping the noise (Theres No Play)
Handbrake assembly ??

Cheers

Dean

 

if you pull handbrake lightly does it stop?

could be the handbrake shoes rubbing..

or wheel bearing like you say.. any play in it?

Simon

 

Mines been doing exactly the same thing for the last 12 months. I still carnt fined what’s causing it I thought I would eventually go what ever it is but no its still doing it but now its got a faint chatter like noise a bit like gears catching up I carnt really explain it but I thought it was coming from the diff to I did notice if I put 40psi in my front tyres and 45psi in the rear it makes it a bit quieter

 

Simon.

If you pull the handbrake up to the point where it bites & you can feel the car squat slightly, It then stops !

The weird thing is that it only does it on overrun, There is no play what so ever in the wheel bearing, & as TurboTronics says, It is a sound likened to gears Etc..
Just had another thought, Could it be drive shaft related ?/ Although the tend to have a more definitive noise ?

Im going to strip the N/S rear hand brake assembly tonight, Clean up thoroughly, apply copper slip & go for a run with my Ear Plugs In Noise Cured !!
Thanks

Dean

 

Iv changed all my brakes after the problem started and I did not see any thing that would cause this noise I think its just ware in the gear box my self but when iv changed the oil in the diff and the gear box I found no filings in the oil and it was quite clean to be honest

 

Chris Palmer's Home Page
try having a read at this if it helps any

 

Same here on the oil front, Both the gearbox & Diff were nice & clean & had no metal bits or the usual metallic paste on the drain plug .

I must admit it is Bizarre !!!

Dean

 

Like a said before mines been like this for 12 months now if it was the gearbox I would have gone by now the way I drive it some times so until sumert goes I don’t think I will ever fined out what it is

 

Sounds like gearbox bearings to me, their prone to wearing out. Had mine done for the very same fault your describing, at a cost of £750!
When on over run, in 3rd gear, push the gearstick lightly forward. If your bearings are shot you'll feel it.

Tim

 

Will give that a try Tim.

Cheers

Dean

 

~Are we talking about a metal rattling kinda sound? Mine has been doing it for about 4 years now!

I thought it was the gearbox but that was fully rebuilt a few months ago and its still there. I also thought it was the clutch mini springs (4 of them around the centre point) because if the hole is press cut too large they can rattle. I had a new clutch at the same time as the gearbox so I very much doubt its that.

I have heard others talk of this before but no one has ever come up with a definate cause of the noise.

 

We must be all hearing things

 

Yes, Sought of something catching/ rubbing & clanging, Almost like a Millers wheel noise !!!

With mine , I don't understand why dabbing the handbrake stops it, But the foot brake doesn't. It does it in all higher gears. the handbrake thing makes me think/lean towards wheel bearing , as if it's loading the bearing so stopping the noise.
I removed the handbrake assembly last night , Cleaned up, Removed all lips of the drum, Copper slipped up on the contact points & No different (apart from the Handbrake working better)

So with that in mind , I think im gouing to change the N/S rear Wheel Bearing as the noise seems more prominent from that area..

This Type of Bloody Noise in V annoying & V expensive to find / Cure

My clutch release bearing is noisy at standstill, I can't imagine one of those would rattle like that on overrun & transmitt as if it was coming from the rear

Cheers

Dean

 

('93 wrx) I had a problem with my fifth and reverse gear so I repaired myself using all original bearings etc (as my box had always been quiet) all I did other than fixing fifth was to change the casings to slightly newer onew (still ty752)

since it's been back together I have a similar noise to what your describing (mainly in fourth but also in third)

I have still only done a few hundred mile since build so hopefully it wont get worse.

bit of a strange one ay guys

still yet to try on 1/4 mile as well........very nervous

 

It is a strange one.
Mines a TY752VN6AA Box, You can drive it hard & it's as quiet as a mouse, I was led to believe that gearboxes generally give the most noise when worn under load, I.e accelerating !!

It's amazing that once you have a noise how you home in on it & i did not realise i did so much coasting

Dean

 

Well Decided to remove both rear wheel bearings I did not realise that they consist of two taper bearings (Inner, Outer & sleeve Etc), I thought they were needle roller type !!!

Anyhow, Upon physical inspection they look fine, No tight spots or pitting, Just a bit of blueing on the face where the taper bearing seats

So assembly will be finished tomorrow, But sadley im not expecting this to have cured my problem

I'll let you know.

Dean

 

I have just thought of something. Have you got a standard clutch in? I have a stage one organic clutch in and have herd that some clutches can make your car make funny noises and when I think back mine might have started at the same time as the clutch went in

 

I had the same issue on overrun.....until my box broke last week Mine has broke the woodruff key on 5th gear and damaged both 5th gears.

I run the exedy uprated clutch and an API lightened flywheel, there has been a few people on SN that have the same over run noise since fitting the exedy clutch and a lightweight flywheel.

https://www.scoobynet.com/drivetrain...=overrun+noise

 

Cheers T5OLF.
Now i don't know whether to be pleased or sadened !!
The thread definately relates to my noise, But im unsure as to what clutch & flywheel is fitted to my car as i have never had them apart. I do have a noisy release bearing though & mine from memory seemed to start after fitting these wheels & increasing the power
http://images.fotopic.net/?iid=yn27s...600&quality=70
Which lead me up the Rear Diff & Bearing path.

The noise is quite loud at times & embarrising, I think i'll pop down to production & pinch some ear plugs from now on & let it develop

Cheers

Dean

 

thats what i thought 12 months ago
still waiting

 

Perhaps if i keep accelerating instead of decelerating the problem will develop faster & i'll find a cure

Dean

 

Well put it all back together with two New Shiney Rear wheel bearings, Go on the test drive & as predicted , No change, Ahhh Hahhh

Next Mod = Silicone inserted into Ear Canal

Dean

 

Dean, did you ever find out what this noise was?

 

sounds more like a chewed stop ring on the 3rd gear. Very common and almost always harmless. If the noise becomes more like a grrrrrrr then it could mean a trip to the dentist, otherwise I would just monitor it and carry on.

 

Cheers
I will monitor it as you say, i have purchsed a PropShaft for £4.99 so i'll be fitting that as a last swap out, Hoping it's the Carrier/Centre bearing , If theres no change then it can develop

Dan.
As of yet No

Dean

 

Well swapped the Propshaft last night for a two piece (1 Piece was fitted) & No Change Although the Prop carrier bearing on the original 1 piece prop did have a lot more play in it than it's replacement, It still spun quite freely with no tight spots Etc.
Defo looks like the Silicone injection direct into the Ear canal is called for

Dean

 

Well, I think i have found the Culprit !!

The noise has developed & is now in 3rd, 4th & 5th & definately from the Near side rear, So on ramps & under i go.
Near Side Rear Drive Shaft, Hub assembly End, Coupling Has quite a bit of play in it. If you push & pull the drive shaft @ that end it knocks a moves quite bad.
Has anyone got a N/S Rear Drv Shaft for a 1998 UK Scoob?? Not Knackered of Course

Cheers


Dean

 

I'll keep an eye on this thread.