Throwout bearing grinding on pressure plate - Toyota Nation Forum : Toyota Car and Truck Forums

sloppychicken · 04-23-2005, 03:37 AM

I swapped the motor in my friends 91 4x4 with the 22re. When we started up the motor for the first time it sounded great, but when the clutch was released it made a metal on metal grinding noise. We shut down the motor and pulled the tranny. There was a score mark on the pressure plate where the throwout bearing touches it. If you put a small amout of pressure on the clutch pedal, the sound goes away. It's almost as if there isn't enough pressure between the throwout bearing and the pressure plate to make it spin so intead it grinds. The clutch was newer at the time the motor was swapped. We swapped the clutch 500 miles before the motor went. Is there an adjustment to the clutch that can be made to put more pressure on the pressure plate when the clutch pedal is fully released? Am I way off on my diagnosis? Any ideas? Please help, I don't want to have to pull the tranny again.

Paul

87_SR5 · 04-23-2005, 02:45 PM

Quote:

Originally Posted by sloppychicken

I swapped the motor in my friends 91 4x4 with the 22re. When we started up the motor for the first time it sounded great, but when the clutch was released it made a metal on metal grinding noise. We shut down the motor and pulled the tranny. There was a score mark on the pressure plate where the throwout bearing touches it. If you put a small amout of pressure on the clutch pedal, the sound goes away. It's almost as if there isn't enough pressure between the throwout bearing and the pressure plate to make it spin so intead it grinds. The clutch was newer at the time the motor was swapped. We swapped the clutch 500 miles before the motor went. Is there an adjustment to the clutch that can be made to put more pressure on the pressure plate when the clutch pedal is fully released? Am I way off on my diagnosis? Any ideas? Please help, I don't want to have to pull the tranny again.

Paul

There should be a free play adjustment you can make on the clutch master cylinder. There is a locknut on the clutch master cylinder pushrod...loosen that and turn the pushrod until the freeplay is correct, then retighten. I guess you can just adjust it until the noise goes away. I haven't had to do this, but I am just stating what my manual says.

So there is an adjustment you can make, but I am not saying that it is definitly your problem (someone else will give you some more ideas). Is the tranny in at the moment? If it is, try the adjustment and see what you get.

Hope this helps.

sloppychicken · 04-24-2005, 04:06 PM

Thanks for the reply. I pulled my push rod off the slave cylinder and it doesn't have a lock nut to make an adjustment. its a solid rod that connects directly to the fork on one end and the piston of the slave cylinder on the other. If the throw out bearing isn't supposed to rest on the pressure plate, shouldn't there be a spring or something that pulls it off?

87_SR5 · 04-24-2005, 08:22 PM

Quote:

Originally Posted by sloppychicken

Thanks for the reply. I pulled my push rod off the slave cylinder and it doesn't have a lock nut to make an adjustment. its a solid rod that connects directly to the fork on one end and the piston of the slave cylinder on the other. If the throw out bearing isn't supposed to rest on the pressure plate, shouldn't there be a spring or something that pulls it off?

Sorry for not being clear. The adjustment is on the clutch MASTER cylinder. There is a pushrod that connects to your clutch pedal. On this pushrod there is a locknut...loosen this and then turn the pushrod to make the adjustment.

The slave cylinder rod just sits in a cup at the end of the clutch release fork, so there is no adjustment there. I don't think the throwout bearing is suppose to be resting on the pressure plate....maybe the clutch is out of adjustment to where the clutch is engaging to early (causing the bearing to keep in contact with the pressure plate).

Some please clarify my reasoning....

sloppychicken · 04-24-2005, 08:47 PM

That would make sense that the adjustment would be there. Anyone know how much play should be on the slave cylinder push rod? Is that really my problem though? Wouldn't the excess fluid return to the resivour? I'm really frustrated with this thing.

Rycam · 04-24-2005, 09:40 PM

The adjustment of the rod on the is easy (10mm jamb nut from memory). YOU DO NOT HAVE TO GET UP UNDERNEATH AND REMOVE THE CLEVIS/RETAINING NUT FROM THE PEDAL ARM. Just loosen the locknut (jambnut), and adjust the freeplay by turning the pushrod with your fingers.

You will likely do this by leg-feel, as the "actual process" is a Japanese concoction of measurements to the floorboard that is not really practical.

Keep us informed!

sloppychicken · 04-24-2005, 09:47 PM

Okay, I don't think its the throw out bearing rubbing on the pressure plate. I had my brother start the truck and I went underneath and pushed the fork so that it pulled the throw out bearing away from the pressure plate and the noise didn't change. When you put a little pressure on the clutch pedal the noise goes away. It sounds like it is coming from the front of the truck. Would that make sense? I used the screwdriver on the ear trick and couldn't locate it. The sound is severe like a lathe would sound. Could there be a problem form a poor rebuild on the motor? Why would it change when the clutch was pushed in?

87_SR5 · 04-24-2005, 11:25 PM

Quote:

Originally Posted by sloppychicken

Okay, I don't think its the throw out bearing rubbing on the pressure plate. I had my brother start the truck and I went underneath and pushed the fork so that it pulled the throw out bearing away from the pressure plate and the noise didn't change. When you put a little pressure on the clutch pedal the noise goes away. It sounds like it is coming from the front of the truck. Would that make sense? I used the screwdriver on the ear trick and couldn't locate it. The sound is severe like a lathe would sound. Could there be a problem form a poor rebuild on the motor? Why would it change when the clutch was pushed in?

Okay, so you determined that its not the throwout bearing itself that is making the noise. I have no idea what could be making the noise if it is coming from the front of the engine, since the clutch is not even part of the engine...its just controlling the slave cylinder.

Could it be the tranny? Since the input shaft for the tranny is turning while it is in neutral (clutch pedel not down)....and then you push the pedel in, this stops the tranny, eliminating the noise???? But then you said if you put a little pressure on the pedal. How little? Enough pressure to disengage the clutch and put it in gear?

I dont know...thats my best guess. I don't think it would involve anything with the clutch (clutch, pressure plate, pilot bearing, throwout bearing) since you eliminated the possibility of the throwout bearing.

Let us know what you come up with...

sloppychicken · 06-26-2005, 01:17 PM

It's been a while since I posted in this thread and the truck hasn't moved. I just got time today to play with it. I pulled the harmonic balancer from the crank and found metal shavings. The balancer was rubbing against the oil pump housing. How could that be? Did I crank it on too much? any thoughts? HELP!!