Changed throwout bearing and still noisy

JeffG in WI · Aug 19, 2016

I have a 1954 NAA with newly rebuilt engine, and thanks to the help I got on this forum, it is running great. But....

While I had it taken apart, I figured I'd split it and try to fix the nagging grinding/rattling noise in the middle to back half of the tractor. The noise was always present, EXCEPT when I pushed down on the clutch pedal. Louder when in gear than when out of gear, but still always there if the clutch pedal wasn't pressed.

I changed the clutch assembly, pilot bearing, throwout bearing, and bearing at the rear end of the input shaft. Figured it would be fixed. But now that the tractor is running again, the noise is still there!

Any ideas?

Thanks!
Jeff

Tall T · Aug 19, 2016

(quoted from post at 19:53:28 08/19/16) I have a 1954 NAA with newly rebuilt engine, and thanks to the help I got on this forum, it is running great. But....

While I had it taken apart, I figured I'd split it and try to fix the nagging grinding/rattling noise in the middle to back half of the tractor. The noise was always present, EXCEPT when I pushed down on the clutch pedal. Louder when in gear than when out of gear, but still always there if the clutch pedal wasn't pressed.

I changed the clutch assembly, pilot bearing, throwout bearing, and bearing at the rear end of the input shaft. Figured it would be fixed. But now that the tractor is running again, the noise is still there!

Any ideas?

Thanks!
Jeff

Jeff,

Was it making noise even before your replacing of the parts?

If it was a faulty (noisy) throw out bearing it would make noise only when you pushed the pedal down.

I'm also not sure what your clutch fork lever assembly looks like, but the throw out bearing could be rattling in its fork or the clutch fork lever or shaft itself could be rattling and so when you put pressure on that linkage the rattle stops.

Terry

KL-VA · Aug 19, 2016

Does the noise change when the PTO is engaged and dis-engaged?

Dean · Aug 19, 2016

Not a symptom of a failing throw out bearing.

Could be chipped teeth on the cluster gear.

No way to know without visual inspection.

Dean

JeffG in WI · Aug 19, 2016

PTO engaged or disengaged doesn't matter. Still makes noise. Only stops if I press down on clutch pedal.

Thanks!
Jeff

JeffG in WI · Aug 19, 2016

Yes, was making noise even before replacement.

When I replaced all of the parts, I was kind of wondering if maybe the carrier for the throwout bearing was rattling on the input shaft housing. The fit was pretty tight, but still a little play there. But it seems to be a little more of a grinding noise than I would expect from a little rattling....

Thanks again!

Jeff

KL-VA · Aug 19, 2016

Press the clutch pedal and everything in the middle to back half of the tractor stops moving. There are a bunch of parts in the transmission that could make a grinding/rattling noise. Pulling the top cover and looking in there while gently rocking the tractor in gear might reveal something. I'd probably be looking to find a good used transmission.

Tall T · Aug 19, 2016

Jeff,

If the worst case scenario turns out to be true . . .
then to baby her along, Amsoil has some very cool "Severe Gear" gear oils:
75W140
SAE 190
SAE 250

for while you're shopping for another transmission.

Get someone to depress the clutch, while you listen with a stethoscope to track down the highest amplitude of the sound.

like a noisy rod bearing on or #2 or #3 cylinders
is gonna sound loudest at the drain plug
I was thinking rod more than wrist pin, but I didn't say that on that other thread.

Cross your fingers for the pedal to throwout linkage.

T

Bob · Aug 20, 2016

"when I pushed down on the clutch pedal"

U got it backwards. TO bearings make noise when the clutch pedal is depressed.

You did a lot of work for NOTHING.

Kirk-NJ · Aug 20, 2016

Probably a bearing going bad in the trans. It could run like that for years or it could go next week. It will only cause more damage when it goes. Best to open it up and get it fixed.

Kirk

Bruce (VA) · Aug 20, 2016

Please tell us how depressing the clutch
will make a noisy rod bearing or wrist pin
go away.

JeffG in WI · Aug 20, 2016

(quoted from post at 22:48:52 08/19/16) "when I pushed down on the clutch pedal"

U got it backwards. TO bearings make noise when the clutch pedal is depressed.

You did a lot of work for NOTHING.

The work was definitely not done for nothing. The pilot, throwout, and input shaft bearings were all in bad shape and still needed replacement. And after clutch replacement, my clutch pedal went from having a ton of free play to right at the recommended 3/4" of free play.

Jeff

Tall T · Aug 20, 2016

(quoted from post at 04:48:36 08/20/16) Please tell us how depressing the clutch
will make a noisy rod bearing or wrist pin
go away.

Bruce,

I was just referring to that other thread where the guy discovered that his knock was a faulty rod bearing. I was talking about tracking down the source of the noise.

But you probably know that and if you weren't so eager to undermine you would have known that.

Nice try.
Comparing yourself to others by putting them down isn't going to make a man out of you so you might as well give it up.

Bruce (VA) · Aug 20, 2016

I asked a question. Simply clarifying your
response without the condescending remarks
would have been appropriate. But that would
no doubt conflict with your definition of
manliness.

Tall T · Aug 20, 2016

(quoted from post at 10:57:55 08/20/16) I asked a question. Simply clarifying your
response without the condescending remarks
would have been appropriate. But that would
no doubt conflict with your definition of
manliness.

Bruce,
If you were being sincere then I apologize.
But if you re-read what I first said you can see where I mentioned that previous thread about the noisy rod just as an example. Maybe it was a little vague . . . so sorry about that.

I wrote:
"like a noisy rod bearing on or #2 or #3 cylinders
is gonna sound loudest at the drain plug
I was thinking rod more than wrist pin, but I didn't say that on [b:3855872d00]that other thread[/b:3855872d00]."

Den N Ms · Aug 20, 2016

Jeff,If your noise is when the clutch petal is let out,then it is not the throw out bearing.The noise is from a bad rough transmission bearing and race.I have seen a lot of main input drive bearings be rough and bad causing noise.If you are lucky that might be the only one bad.

Changed throwout bearing and still noisy

JeffG in WI

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