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TR4/4A 1967 Tr4 a Transmission noise

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Oldcarhobby

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Greetings, I am starting to hear a slight “ whuring” noise that appears to be coming from my
Transmission area! . When the car is in neutral & running I can make the noise go away by pressing my
Clutch all the way in ,upon releasing the clutch the noise will start when the clutch is about 1/2 out .Is this an
Indication that my release bearing is on its way out ?. Is there any other test I can do help diagnose this noise problem .? I do have overdrive …. Many thxs for your help
Charlie
 
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That might be the Throw Out Bearing itself spinning on the fork.
If so an anti rotation pin would stop the rotation and the noise.
throw out bearing carrier pin.jpg
 
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Simple things first: did you check the transmission oil level?

I can't think of anything else that doesn't require pulling the transmission. It doesn't sound to me like the kind of problem that will get more expensive to fix if you don't do anything; perhaps something in the clutch or the input-shaft bearing. I think it's safe to leave it alone at least a little while and see if it gets worse.
 
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The release bearing would make noise when pushed, not released. There is a slight chance that mis-adjustment could cause noise, like Ken said.

The most likely cause is the needle bearings in the countershaft are wearing. They normally make a hissing, whirring noise as they slowly die...and it is most pronounced when sitting at a stop in neutral with the clutch engaged. At the early stages you won't hear it when driving.
 
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Sarastro said:
Didn't think of this earlier, but maybe the pilot bearing?
Click to expand...
I would think the noise would accur in the oposite situations if it was a worn pilot bushing. With the transmission in neutral and the clutch pedal released/clutch plate firm against flywheel, the engine and input shaft would spin at the same rate and would not vibrate against each other.
With the transmission in neutral and the clutch pedal depressed/clutch plate spinning against the flywheel, the crank and input shaft would spin relative to each other and be able to vibrate and cause the nosie.
 
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All my TRs make that noise in that area. TRs are small cars with big heavy parts moving circular in the bellhousing area which amplifies the noise. Ken’s solution would quiet the noise down. Like Steve said, drive the car. My view is also drive the car with that small noise because the other parts in the clutch assembly like the input shaft bushing and the throughout bearing on the sleeve contribute to the noise of an older car.

Steve
 
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Beware of sudden noise changes in an old Tr4/6 box!!
They have a nasty habit of counter shaft failures at high mileage.
When the bearings on the counter gear shaft go out ,the damages get worse with every mile you drive.
In 50 or 100 miles it becomes fatal. If the box has an OD it destroys the unit too.
Drain the gear oil and look for glitter in the oil.If you see it your done.
Mad dog
 
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