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post #1 of 54 (permalink) Old 03-23-2011, 12:11 AM Thread Starter
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Throwout Bearing

So after lots of reading here, and having multiple people ride in my truck to listen, I have decided the throwout bearing is bad. I have a high pitched fluttering /chirping from my drivetrain. I greased the u-joints and checked my CVs. All good. It does not change when turning(like a wheel bearing).

When I press the clutch in the sound disappears and then returns upon release. What I have read here, is that indicates the throwout bearing. Sadly this is a Marlin set up only a year old! Nachi throwout.

If my assessment is correct, am I in any danger of the bearing exploding or causing a catastophic failure? Thoughts? Is there a foolproof test for confirmation?

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post #2 of 54 (permalink) Old 03-23-2011, 03:29 AM Thread Starter
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After some more reading it seems that it could be the input shaft bearing or possibly the shift fork. It does seem that the majority think, if it is actually the throwout, I am not risking to much damage. Comments welcome please. I'm still unsure.

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post #3 of 54 (permalink) Old 03-23-2011, 08:25 AM
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when it goes it will be impossible to shift

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post #4 of 54 (permalink) Old 03-23-2011, 08:52 AM
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Well that's nice... I just ordered a Marlin kit..

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post #5 of 54 (permalink) Old 03-23-2011, 10:24 AM
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Did you check your clutch pedal adjustment when you installed the clutch?

You can determine if it is the throwout bearing by moving the clutch fork by hand. However based on what you already said, it sounds more like the throwout bearing then the pilot. The bearing squeaking is an early sign that it is dry and will eventually need to be replaced. They can survive for months like that, but be aware that they could suddenly fail with little warning.

NSK is still the bearing brand I recommend for use as throwout bearing. They last the longest.
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post #6 of 54 (permalink) Old 03-23-2011, 11:38 AM
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It does sound like the TO bearing. Two things kill the bearings. 1. improper freeplay adjustment in the pedal. 2. Sitting stopped with the clutch depressed. I did get a bad bearing once. I installed it during a clutch upgrade and had to pull it right back out. The TO bearing should easily outlast the clutch. I've never had one fail, but I never sit with the clutch depressed. I shift into neutral at every light and every stop lasting more than a few seconds. Yeah I'm one of those guys If the guy behind me doesn't think I'm moving fast enough, then I shift into reverse That clears up that noise pretty quick. Bottom line is, you can make a TO bearing last if you give it a little effort, or you can kill them with bad driving habits.

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post #7 of 54 (permalink) Old 03-23-2011, 12:20 PM
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Don't feel bad....I might have to put a new berring in mine as well. =0(

I just changed teh damn clutch not too long ago as well.....ARGH.

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post #8 of 54 (permalink) Old 03-23-2011, 02:16 PM
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Originally Posted by TheosTaco View Post
Don't feel bad....I might have to put a new berring in mine as well. =0(

I just changed teh damn clutch not too long ago as well.....ARGH.
What brand clutch?

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post #9 of 54 (permalink) Old 03-23-2011, 03:05 PM
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Quote:
Originally Posted by Wainiha View Post
So after lots of reading here, and having multiple people ride in my truck to listen, I have decided the throwout bearing is bad. I have a high pitched fluttering /chirping from my drivetrain. I greased the u-joints and checked my CVs. All good. It does not change when turning(like a wheel bearing).

When I press the clutch in the sound disappears and then returns upon release. What I have read here, is that indicates the throwout bearing. Sadly this is a Marlin set up only a year old! Nachi throwout.

If my assessment is correct, am I in any danger of the bearing exploding or causing a catastophic failure? Thoughts? Is there a foolproof test for confirmation?
I had a similar issue with my 2000 Taco. Mine made the chirping noise when the clutch was depressed and a gear was engaged. The resolution for my problem was an entire transmission rebuilt (everything except the cogs). Luckily it was under warranty. Hope this isn't the case for you!

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post #10 of 54 (permalink) Old 03-23-2011, 03:11 PM Thread Starter
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Entire trans! Don't even say that

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post #11 of 54 (permalink) Old 03-23-2011, 03:30 PM
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Quote:
Originally Posted by Wainiha View Post
Entire trans! Don't even say that
Sorry, sorry! I'm just telling you my experience. Honestly, if it's making that noise every time the clutch is depressed, you may be right and it could just be a TO bearing. Mine made the noise when I was in gear AND the clutch was depressed. Apparently my issue was a known issue with early Taco's. If yours just started doing this, probably not the transmission issue mine had.

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post #12 of 54 (permalink) Old 03-23-2011, 04:00 PM
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Wainiha,

The way you've described it, it does sound like it's the release bearing. As Teryx mentioned, the release bearing should outlast the clutch. I've been running the same Marlin Crawler Nachi bearing since 2004 without any trouble.

We stand behind our products but unfortunately sometimes crap happens. We sell a TON of clutch kits and very, very, very rarely have complaints about the Japanese bearings we use, which is why we use them!

I don't work in sales but I'd advice you to call in: 559.252.7295. I can't make any promises, but maybe we could help ya out with shipping or something? Are you able to drop your transmission (do you have a place to work & some tools)?

Sorry for the trouble

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post #13 of 54 (permalink) Old 03-23-2011, 04:10 PM Thread Starter
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Wainiha,

The way you've described it, it does sound like it's the release bearing. As Teryx mentioned, the release bearing should outlast the clutch. I've been running the same Marlin Crawler Nachi bearing since 2004 without any trouble.

We stand behind our products but unfortunately sometimes crap happens. We sell a TON of clutch kits and very, very, very rarely have complaints about the Japanese bearings we use, which is why we use them!

I don't work in sales but I'd advice you to call in: 559.252.7295. I can't make any promises, but maybe we could help ya out with shipping or something? Are you able to drop your transmission (do you have a place to work & some tools)?

Sorry for the trouble

BigMike
I really appreciate the reply. I have to work in my yard in the grass, uncovered from rain unfortunately.

I have only had this kit insince last March. Toyota did the install. I had to machine the flywheel at that time and logistics prevented me from doing the backyard install. Couldn't afford more than one day down time. Anyway, I could get a friend to help drop it. What signs or indications of bearing failure do I look for? There are no issues as of now other than noise. But, I do not want a small problem to turn into a big one.

I am very poor and CANNOT AFFORD a catastophic failure!

Thank you, Blake

2000 Tacoma
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post #14 of 54 (permalink) Old 03-24-2011, 01:04 AM Thread Starter
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Bump.

What am I looking for? Discoloration?

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post #15 of 54 (permalink) Old 03-24-2011, 12:00 PM
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I have a marlin clutch kit in my 01 3.4l, and the throwout bearing has ticked since about 3 months after I put the clutch in. It ticks pretty loud, but quiets down as soon as I put a little pressure on the pedal. If I'm talking to someone standing next to the truck, I put a toe on the pedal to keep it quiet so they don't ask what's wrong with the truck.

I bought the clutch new in it's box second hand from someone that bought it from marlin and ended up not using it, so there's no warranty. Even if there was, I wouldn't pull the damn trans again just to toss another throwout bearing in. What says that one will last any longer?
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post #16 of 54 (permalink) Old 03-24-2011, 12:42 PM
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Before going to buy a bunch of new stuff check your slave if you haven't already. I just did a marlin setup about 1K ago and had a ver very simialr problem. Because my slave was not resting with any pressure on the fork with the pedal out it started whining really loudly, almost sounded like a pulley going bad. And it would go away immediately when I just barely pushed in the clutch. So check and see if you have any sort of gap between the piston on your slave and the clutch fork when it sits idling. If so pop in a new slave cost me $30 and about 15 min of my time which was a huge relief after having just done my clutch as well. Hopefully that helps give it a look.

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Last edited by DubJunkE; 03-24-2011 at 12:45 PM. Reason: edited for spelling typing too fast
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post #17 of 54 (permalink) Old 03-24-2011, 01:28 PM Thread Starter
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Thank you everyone

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post #18 of 54 (permalink) Old 03-24-2011, 05:38 PM
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I had something very similar what you were experiencing. the noise was a chirp and it went away once i pressed the clutch in. It would chirp loud at idle and not in gear. I first adjusted the clutch from inside the vehicle, that helped a little. what FIXED the problem wasn't a TO bearing. I sprayed white lithium grease inside the boot where clutch master cylinder fork goes inside clutch the housing. Its been quite ever since. I would try that first as it only takes a minute to complete. good luck!

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post #19 of 54 (permalink) Old 03-24-2011, 05:50 PM Thread Starter
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Did you shoot it in the holes pictured or do I have to remove the boot entirely?

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post #20 of 54 (permalink) Old 03-24-2011, 06:04 PM
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Did you shoot it in the holes pictured or do I have to remove the boot entirely?
No, you don’t have to remove the boot. Yes, spray in the holes. You have to feel around with that spray can straw they provide and you should locate two crevasses inside that boot.
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post #21 of 54 (permalink) Old 03-24-2011, 06:18 PM Thread Starter
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Thank you.

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post #22 of 54 (permalink) Old 03-24-2011, 07:15 PM
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The boot is easy to remove if you do want to spray in there. I had a squeak when I first got the truck when I pushed the clutch pedal in, and it has been quiet since when I sprayed white grease into the hole.

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post #23 of 54 (permalink) Old 03-24-2011, 08:01 PM
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I hope you realize that if you aren't careful, you can spray grease right on the clutch assembly.
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post #24 of 54 (permalink) Old 03-24-2011, 09:26 PM Thread Starter
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I hope you realize that if you aren't careful, you can spray grease right on the clutch assembly.
What course of action would you suggest?

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post #25 of 54 (permalink) Old 03-24-2011, 11:29 PM
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There is no easy fix if the throwout bearing is making noise. It has to be replaced. But before you do that, check the pedal freeplay for proper adjustment. If you have a pedal creak coming from the bellhousing, then applying grease to the pivot ball on the clutch fork is a good idea, and can be done by removing the boot and either carefully spraying (only temp fix) or using some sort of tool to apply grease liberally to the pivot ball.

Trying to grease any other component in the bellhousing while the whole thing is assembled will most likely cause grease to contaminate the clutch disc.
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post #26 of 54 (permalink) Old 03-25-2011, 05:47 AM
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I have same chirping on my 02 tacoma and it started in the first year i had the truck. I have found thats its not the throw out bearing its where the pushrod from the clutch release cylinder meets the clutch fork. Its a shitty ass design metal against metal. If you put a little dab of grease there it will help for a short period of time and chirping will come back. Go under truck and push the pushrod back away from the clutch fork the noise will stop to confirm thats whee the noise is coming from.
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post #27 of 54 (permalink) Old 03-25-2011, 03:54 PM Thread Starter
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I will try adjust the pedal and then check the slave before dropping the trans. Thank you all for the help.

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post #28 of 54 (permalink) Old 03-28-2011, 01:58 PM
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Hey guys,

Interesting discussion going on. Spraying grease into the bellhousing is certainly not something I would recommend because you can't be sure where the grease will end up.

For those who install your own clutch, are you guys applying any lubrication to the nose cone, transmission input splines, fork and pivot? I mix grease with antiseize and apply a very small amount to both. If it gets dry in there, I wonder if this could be giving you guys trouble?

I just put up a copy of the FSM for installing a clutch kit on our website. The bottom of page 3 talks about applying grease to the aforementioned components.
As for how to inspect a release bearing, check the 4th item on page #2:

Marlin Crawler Clutch Kit Install Instructions:
http://www.marlincrawler.com/tech/gu...l-instructions

Regards,
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post #29 of 54 (permalink) Old 03-28-2011, 02:28 PM
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darn mines makeing noise too and i just replaced everything and lubed the splines

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post #30 of 54 (permalink) Old 03-28-2011, 02:47 PM Thread Starter
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As per comments here I cancelled the spray oil plan.

I am still going back and forth on what is causing my noise. Maybe I just don't want to admit to myself I will have to drop the trans. If pushing in the clutch makes the sound go away, the general consensus seems to indicate the throwout. The thing is it's so faint, I can only here it going across a steel bridge. That is when the sound is reflected back at me.

I went under the truck and it is not making any audible noise while stationary. I didn't have anyone around to rev the engine and raise RPMs though. Just a little clutch pedal pressure and the sound is gone. I guess I need to check pedal adjustment first. Maybe I need a friends help and also try putting the truck on jackstands so I can put it in gear and spin the entire drivetrain and listen again.

How much does the transmission/transfer combo weigh?

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