Outer Limits 4x4 Board

Went out wheeling a few days ago and gave the thing a hard time, was fine all the way home but the next day on my way to work i noticed there was a squeal coming from the motor or gearbox. The squeal only happens softly at about 1800rpm then goes away until 3200rpm at which point it is a lot louder.

I have removed all drive belts and the noise still happens, so that rules out alternator, power steer pump and water pump.

It also happens if the gearbox is in neutral or in gear, also with clutched in or out it makes no difference.

The only other thing i can think of is the spigot bearing or the thrust bearing but i would have thought the noise would be constant, not at certain RPM's

Any ideas?

Well, with those bearings the faster the engines going the more stress is on the bearing, so it would make sense for it to cause that problem.
I'm about to change the thrust bearing in my hilux cause it makes noises, but only when clutched in ie. the bearing is being used.
I would guess it's the spigot bearing, but as far as I know that also only spins when the clutch is depressed...

So I have no idea then

spigot bearing spins with the flywheel even if the input shaft is stationary.

How much of a hard time we talkin here? Bogholes without a air filter? lol Man mines flogged bigtime and dailyd n runs like a dream? They are very tough so id imagine it being something small, unless youve done what ive said above haha..

na not that much of a hard time. i guess it wasn't that bad, just spent a lot of time on the limiter. I know its going to be something simple but without pulling the box and replacing both thrust and spigot bearings i have no way of finding out if they are the cause. i have tried standing in front of the car and idled it up to 3000rpm but cant tell where the noise is coming from.

dillza_69 wrote:spigot bearing spins with the flywheel even if the input shaft is stationary.

Yes but when the input shaft is spinning when the truck is moving, the spigot shouldnt be turning, so it shouldnt be making a squeeling noise as the input shaft would be spinning at the same rpm as the flywheel.

Thrust bearing only spins when the clutch is disengaged.


I know chriso's 3rz loves the limiter haha, as most do but when you pull down a 3rz, you'll soon see the rods won't take high rpm for ever .

Water pump ? i know nothing can get in there but could be on its way out??, unlikely that it would squeel though.

berad wrote:

dillza_69 wrote:spigot bearing spins with the flywheel even if the input shaft is stationary.

Yes but when the input shaft is spinning when the truck is moving, the spigot shouldnt be turning, so it shouldnt be making a squeeling noise as the input shaft would be spinning at the same rpm as the flywheel.

Good point, didnt think of it that way. So its safe to rule out he spigot?

As for the water pump, i have taken the belts off and the noise was still there, so that rules that out along with alt and pwr steer.

The squealing is there regardless of what position the clutch is in so i guess i can rule out the thrust bearing as well?

What else is left? got me stuffed

So its a belt squeeling sound?.

Clutch fan, shouldnt make a noise like that but take it off and rule it out ahha.

Has me stumped, has to be something that spins, could be a bearing somewhere but doubtful, if its slipping the motor would be in serious trouble and you'd know by now.

Nothing stuck on something that spins, bit of steel or a stick or something?

I know it comes and goes, and shouldnt be, but nothing in the brakes?.

on the firewall end of the fuel rail there is a fuel dampner thats not squeeling?, im clutching at straws haha.

sounds more like a bearing squealing than a belt.

I have thermo's so clutch fan is out, its definitely associated with the engine as it comes and goes at the same engine speed every time. I know it shouldn't be but i was thinking maybe the thrust bearing is contacting the clutch fingers constantly maybe causing the squealing?

As for the stick or similar contacting something, this is also possible as i don't have a cover on the bottom of the bell housing, i have had a look in there but cant see much past the flywheel. Although, considering how much driving i have done since i would think it would have worn away by now.

The fuel dampener is something to go on, never even knew what it was. Do they sometimes squeal?

Not that i've heard of haha, but i guess they could, im just throwing everything out there haha, hopefully its just something stupid like that.

Something could be caught between the fingers and something etc, seen as you dont have the bottom plate on the bellhousing haha, might be worth a look won't take long to pull the rear shaft undo the box mount and bell housing.

As chriso said the 3rz is a workhorse and you won't see to many fail due to bearings etc so long as they are maintained

Have you checked the oil level.

PCV valve ontop of the valve cover? mine makes some f*$ked up noises, one of which is a ticking sound, hit it and it will squeel for abit...
Could be another thing to sus out,
turn da radiooooo upppp

I have ruled out the pcv. The only other things it could logically be are;

air is being sucked in from the seals around the injectors? ( I would think the noise would be a whistle and would be constant)

The thrust bearing, I have a feeling there is no air gap between it and the clutch fingers, i got under the car and pulled on the clutch fork (in the direction that would force the thrust bearing to contact the clutch fingers) and there was no movement at all. The other reason i think its the thrust bearing is it sounds like the noise is coming from behind the motor

Other than these to things it would have to be internal.

I have a new thrust bearing and i'm going to fit it over the weekend. fingers crossed that's the problem

Won't be the injector seals, the valve shuts before anything could suck/blow/do a backflip etc.

Worth a shot with the thrust bearing, put a cover plate on the bellhousing while its off.

berad wrote:
Worth a shot with the thrust bearing, put a cover plate on the bellhousing while its off.

yeah will do haha

ok i have replaced the thrust bearing and the noise is still there. I also checked for foreign objects stuck in clutch, bell housing ect and all was clear.

I have pretty much decided it must be internal, i have ruled out water pump, alternator, pwr steer pump and thrust bearing. Cant be spigot and has nothing to do with the gearbox.

Im stumped, what internal components would make this noise?
Could it be either one of the crank seals even if neither are leaking?

It sounds like a dry bearing squeal

Get it to make the noise and while it's doing it, pull the oil filler cap off. Let us know if that stops it.

RAY185 wrote:Get it to make the noise and while it's doing it, pull the oil filler cap off. Let us know if that stops it.

no, didn't stop the noise, any suggestions appreciated. I'm going to check for vacuum leaks tomorrow

Spun bearing?
Crank thrust washers?
Oil Pump?
Cam Bearings?
Piston Ring Picking up in the bore?

Unfortunatly it could be any of these.

RUFF wrote:Spun bearing?
Crank thrust washers?
Oil Pump?
Cam Bearings?
Piston Ring Picking up in the bore?

Unfortunatly it could be any of these.

I Did think about cam bearings but if they had spun i would think there would be oil leaking from around them causing smoke?

As for a ring picking up in the bore, seems unlikely due to the screech/squeal happening at low rpm then again at high rpm with nothing in between, i would expect constant noise of some sort?

I have relocated the oil filter so maybe for some reason the oil pump is starving which is causing the squeal? although i still have good oil pressure.

The noise only happens at specific rpm, with no abnormal noise besides at 2000rpm and 3200rpm?


*EDIT* i was trying to locate the noise today and noticed it doesn't happen at low rpm anymore, only from about 2900 - 4000rpm. It also seems a bit quieter than before. When i stand next to the motor it is a lot harder the hear than if I'm sitting in the drivers seat. Other than between 2900 - 4000rpm the engine runs perfectly with no loss of power at all.

problem solved, turned out to be the heat shield over the uni's on the front drive shaft. It had a crack through it and at certain rpm's must have had just the right harmonics to make the noise i was hearing.

Cheers
for all the input

HAHA, always something ridiculous all the hours gone into messing about, oh well least it was nothing major

yeah, its even funnier because when i was taking the gearbox out i couldn't work out why it wouldn't come back far enough to clear the input shaft of the clutch diaphragm. With a lot of pulling i eventually got it down, then i realized the speedo drive cable was still hooked up.