Rattle !
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Discussion

1 Finger Bandit

Original Poster:

621 posts

241 months

Sunday 29th July 2012
quotequote all
Hotty and I have been playing with the 350i which has a rattle in gear until the clutch is pressed. Initially changed the clutch, then the thrust bearing but still the same. Ideas guys? there seems to be no movement in the crankshaft so layshaft bearing?



simonwedge

763 posts

210 months

Sunday 29th July 2012
quotequote all
Shaun

Does it do the same in neutral i.e. rattles with the clutch out and stops when it's in? Was the thrust bearing changed for a new or s/h one?

Lean Machine

2,715 posts

195 months

Sunday 29th July 2012
quotequote all
I had a similar problem on a Lotus years ago and it turned out to be the spigot bearing on the end of the gearbox shaft. I am not sure if the TVR has a similar bearing but the gearbox against engine is a similar set up. I just thought I'd mention it.

Tony. TCB.

1 Finger Bandit

Original Poster:

621 posts

241 months

Sunday 29th July 2012
quotequote all
Rattles in Neutral too. Thrust bearing is new

vampire222

433 posts

179 months

Sunday 29th July 2012
quotequote all
maybe one of the springs in the clutch got loose that makes it rattle when open

1 Finger Bandit

Original Poster:

621 posts

241 months

Sunday 29th July 2012
quotequote all
Hi Vampire,

Changed the clutch plate beacuse the springs were loose but still the same

adam quantrill

11,679 posts

272 months

Sunday 29th July 2012
quotequote all
Does it rattle until you press very lightly on the clutch?

1 Finger Bandit

Original Poster:

621 posts

241 months

Friday 3rd August 2012
quotequote all
Hi Adam,

It doesn't stop rattling until the clutch is fully pressed down

1 Finger Bandit

Original Poster:

621 posts

241 months

Sunday 5th August 2012
quotequote all
Bump !

Convert

3,757 posts

248 months

Sunday 5th August 2012
quotequote all
Shaun, If you and Steve want to borrow my video borescope you're quite welcome (just let me know where you want it sending to)

hallsie

2,185 posts

250 months

Sunday 5th August 2012
quotequote all
Shaun

When I saw it I was convinced it was the clutch release bearing, but if you have changed that and the clutch and still have the same noise, it could be either the first motion shaft in the gearbox or as a very outside chance, the crank case bearing perhaps?!

if youve hed the gearbox disconnected, did you run the engine?( i assume not because the starter will be bolted onto the gearbox....I think?? Ive net been under the V8 for a starter change yet)

I cant remember if the noise was progressive through thhe gears or constant, time for a gearbox change!?

Good luck

Stu

honestjohntoo

576 posts

246 months

Monday 6th August 2012
quotequote all
The retaining cup fixing tab at the base of the gear change lever may have broken off, leaving the cup to rattle freely responding to every change in engine/gearbox rpm .

(Seen in this image with its retaining bolt between the two arrows pointing to items 3).


Wedg1e

27,040 posts

295 months

Monday 6th August 2012
quotequote all
honestjohntoo said:
The retaining cup fixing tab at the base of the gear change lever may have broken off, leaving the cup to rattle freely responding to every change in engine/gearbox rpm .
Seems unlikely the rattle would then stop when the clutch pedal was depressed at idle...

honestjohntoo

576 posts

246 months

Monday 6th August 2012
quotequote all
Wedg1e said:
Seems unlikely the rattle would then stop when the clutch pedal was depressed at idle...
"You will not apply my precept," he said, shaking his head. "How often have I said to you that when you have eliminated the impossible, whatever remains, however improbable, must be the truth?" - Sherlock Holmes.

honestjohntoo

576 posts

246 months

Monday 6th August 2012
quotequote all
honestjohntoo said:
Wedg1e said:
Seems unlikely the rattle would then stop when the clutch pedal was depressed at idle...
"You will not apply my precept," he said, shaking his head. "How often have I said to you that when you have eliminated the impossible, whatever remains, however improbable, must be the truth?" - Sherlock Holmes.
1 Finger Bandit, the way to test this would be the lift the gear lever with some force and if the retainer cup tab is broken the stick will come away with surprising reaction and in all probability smack you with a stunning uppercut. Bits also fly everywhere! wink

rev-erend

21,623 posts

314 months

Monday 6th August 2012
quotequote all
Exhaust touching on chassis somewhere..

adam quantrill

11,679 posts

272 months

Monday 6th August 2012
quotequote all
»» which has a rattle in gear until the clutch is pressed

Right - so you're driving along in, say, 3rd, and there is a rattle.

Then you press the clutch fully and the rattle disappears.

This removes drive from the engine to the box (assuming clutch working OK).

I'm thinking input shaft - there is a bearing on the input shaft and another between input and output shaft (dipped in oil). Could also be (as mentioned above) missing spigot bearing. A mate of mine had one missing and the 'nose' on the casing where the input shaft pokes out, eventually snapped through.

If you can put up with the noise, may as well continue driving until it fails properly. Then it will be obvious.

hallsie

2,185 posts

250 months

Monday 6th August 2012
quotequote all
honestjohntoo said:
honestjohntoo said:
Wedg1e said:
Seems unlikely the rattle would then stop when the clutch pedal was depressed at idle...
"You will not apply my precept," he said, shaking his head. "How often have I said to you that when you have eliminated the impossible, whatever remains, however improbable, must be the truth?" - Sherlock Holmes.
1 Finger Bandit, the way to test this would be the lift the gear lever with some force and if the retainer cup tab is broken the stick will come away with surprising reaction and in all probability smack you with a stunning uppercut. Bits also fly everywhere! wink
Please video this when you do it!!!

wink

Stu

HOTTY

669 posts

204 months

Monday 6th August 2012
quotequote all
thanks for the posts so far

shaun has identified the rattle but firstly its not the gear lever

whilst the body was off we separated the engine/gearbox to rectify the thrust bearing noise but apart we found the springs loose on the clutch plate, this was replaced and a visual inspection deemed the thrust bearing ok.

the car was put back together but the noise seemed the same and through the gears, so the engine came out to replace the thrust bearing with a new but plastic one, car put back together.

this time the noise is there but a bit of vibration too when shifting through the gears (not on the road but jacked up)

we are already to remove the engine again, just so we can get more in petrol to burn it LOL

just looking for thoughts

adam quantrill

11,679 posts

272 months

Tuesday 7th August 2012
quotequote all
Let me put this another way: on the 400SX I put up with a number of funny noises, including a whine from the box in 4th and 5th (over and above the whine from the passenger seat and the supercharger), vibrations from the rear at 90 (km your honour), and a clonk from the diff.

However I've racked up 40k miles on it without any of these bits breaking. So I would drive it and fix it when or if it breaks properly. Get an insurance policy that includes free recovery, just in case.