Tweating sound from engine compartment

[JBierm44]

Hello,

Just started the 4runner restoration project, many projects to go before it's ready to make the 6,000 mile treck to Argentina (http://www.toyota-4runner.org/showthread.php?t=55543&highlight=Pan-American). Replacing the U joints in the main axle was fairly straight forward. I've been noticing, however, that there is a high pitch tweating-esque noice coming from the engine compartment. It almost sounds like a serpentine belt but seems to be comming from the back of the engine. It happens at idle and seems to stop when I push in the clutch. Maybe a throwout bearing? The vehicle is a 1996 SR5 with 180k. Any advice would be appreciated.

Cheers,

Josh

 

[drmorbius]

Hello,

Just started the 4runner restoration project, many projects to go before it's ready to make the 6,000 mile treck to Argentina (http://www.toyota-4runner.org/showthread.php?t=55543&highlight=Pan-American). Replacing the U joints in the main axle was fairly straight forward. I've been noticing, however, that there is a high pitch tweating-esque noice coming from the engine compartment. It almost sounds like a serpentine belt but seems to be comming from the back of the engine. It happens at idle and seems to stop when I push in the clutch. Maybe a throwout bearing? The vehicle is a 1996 SR5 with 180k. Any advice would be appreciated.

Cheers,

Josh

:iagree:with the throwout bearing.

 

[LINY4Runner]

:iagree:x2

 

[JBierm44]

Figured that was most likely the answer. Should I take the time to replace it? I need this vehicle to make it between 6 and 10 k miles over some pretty irregular and tough roads/not-roads. Is it a peice that will eventually fail and make me immobile or is it just an annoying squeak?

 

[LINY4Runner]

if it's a squeak you prob have a little time left...how much, i can't be certain.

when it gets louder and starts making a grinding sound, thats when you should reallllly worry

 

[JBierm44]

any way to make the sound stop without pulling the clutch?

 

[96743runner]

Definitely the throwout bearing.

The exact same thing just happened to my dad's 91 chevy this past week.

But to make the sound stop I'm pretty sure you are gonna have to pull the clutch, or else it will get much worse to the point that you won't be able to drive it.

 

[drmorbius]

any way to make the sound stop without pulling the clutch?

Just replacing the bearing should stop the noise but you have to pull the trans to get to the bearing so after all that work it would be smart to at least check the condition of the clutch components while you are in there.

 

[JBierm44]

so, in short, this is an issue I should deal with before undertaking a 7,000 mile journey? What should I checks once I've pulled the tranny?

 

[drmorbius]

so, in short, this is an issue I should deal with before undertaking a 7,000 mile journey? What should I checks once I've pulled the tranny?

Remove the pressure plate (after marking one of the bolt positions on the plate and flywheel to preserve balance) and check the condition and thickness of the friction material on the clutch disc. There should be no scoring on the rivets that hold the friction material to the disc on either side. There should not be any "hunks" of friction material missing from either side of the clutch disc. Check for scoring on the pressure plate and flywheel surfaces. Check for excessive wear on the pressure plate "fingers" where the throwout bearing presses. Check for excessive wear on the throwout fork. Check the condition of the pilot bearing in the end of the crankshaft.