Discussion
Ducking here in advance, as I can see something being thrown at the screen, with me still on it.......
........but are you absolutely certain regarding where the noise is coming from? Could it be a prop shaft linkage, or a crankshaft bearing, or something else not actually in the gear box?
Different part of the car, I grant, but the number of times we see TVR diff problems turning out to be CV joints or even anti-roll bar bushes, squeaking shock absorbers turning out to be anti-roll bar bushes, camshaft and tappet noises turning out to be leaking exhaust manifolds. And I haven't even got anywhere near squeaking from the front of the engine engine bay.
I had what I was certain was a wheel bearing going on my Audi.....until my local garage guy with 45 years experience showed me that my rear tyres were worn strangely on the inside edges. And on Wednesday the squeaking front suspension on my Saab turned out to be sub-frame bushes, but we only discovered that when Mat Smith put the car on the ramp, stayed in it with the engine running, and rocked it back and forth on the clutch with his colleague and myself standing directly under the car listening. It sounded for all the world when in the car as if the noise was coming from about 2 feet further forwards.
........but are you absolutely certain regarding where the noise is coming from? Could it be a prop shaft linkage, or a crankshaft bearing, or something else not actually in the gear box?
Different part of the car, I grant, but the number of times we see TVR diff problems turning out to be CV joints or even anti-roll bar bushes, squeaking shock absorbers turning out to be anti-roll bar bushes, camshaft and tappet noises turning out to be leaking exhaust manifolds. And I haven't even got anywhere near squeaking from the front of the engine engine bay.
I had what I was certain was a wheel bearing going on my Audi.....until my local garage guy with 45 years experience showed me that my rear tyres were worn strangely on the inside edges. And on Wednesday the squeaking front suspension on my Saab turned out to be sub-frame bushes, but we only discovered that when Mat Smith put the car on the ramp, stayed in it with the engine running, and rocked it back and forth on the clutch with his colleague and myself standing directly under the car listening. It sounded for all the world when in the car as if the noise was coming from about 2 feet further forwards.
No ducking needed so no need to worry!
The noise occurs when the car is stationary so I doubt it will be the diff. Pressing the clutch in eliminates the noise completely.
New release bearings at each removal and new spigot bushes too suggests these should be ok.
I am not expecting my car to be like a Rolls Royce in terms of refinement and noise levels but a mechanical noise that shouldn't be there does bother me when it should have been sorted. I sat in a similar age and mileage car to mine (amongst others) at Central and even with my ear firmly on the tunnel could not hear anything like the noise mine is making.....
Thanks again. Chris.
The noise occurs when the car is stationary so I doubt it will be the diff. Pressing the clutch in eliminates the noise completely.
New release bearings at each removal and new spigot bushes too suggests these should be ok.
I am not expecting my car to be like a Rolls Royce in terms of refinement and noise levels but a mechanical noise that shouldn't be there does bother me when it should have been sorted. I sat in a similar age and mileage car to mine (amongst others) at Central and even with my ear firmly on the tunnel could not hear anything like the noise mine is making.....
Thanks again. Chris.
s3c chris said:
No ducking needed so no need to worry!
Pressing the clutch in eliminates the noise completely.
With the car in gear or in neutral? You said you were stationery at the time.....Pressing the clutch in eliminates the noise completely.
This implies in neutral, so shirley it's the clutch that is the issue, not the gearbox?
Or as usual I am missing something.
Edited by QBee on Friday 28th July 15:49
With the clutch pedal released and engine running i.e. idling in neutral, the engine is turning the gearbox input shaft. This is done by the splines on the clutch plate which is clamped to the flywheel by the pressure plate.
With the clutch pedal pressed down, the pressure plate releases the clamping effect so now the gearbox is no longer turned by the engine. Therefore, the gearbox is not turning. Many drivers do this when starting from cold to take the 'load' off the engine and starter motor.
So, if the noise only occurs with the engine idling in neutral, pedal not depressed, and there is a noise then this points to a gearbox bearing on the main-shaft or layshaft.
If the noise only occurs when the clutch pedal is depressed then that points to release bearing failure.
HTH.
With the clutch pedal pressed down, the pressure plate releases the clamping effect so now the gearbox is no longer turned by the engine. Therefore, the gearbox is not turning. Many drivers do this when starting from cold to take the 'load' off the engine and starter motor.
So, if the noise only occurs with the engine idling in neutral, pedal not depressed, and there is a noise then this points to a gearbox bearing on the main-shaft or layshaft.
If the noise only occurs when the clutch pedal is depressed then that points to release bearing failure.
HTH.
Gassing Station | Chimaera | Top of Page | What's New | My Stuff