Hey there guys, I've been trying to track down an extremely noisy squealing sound on my 80 series for quite some time now. I've pretty much narrowed down all my possible culprits and was wondering if anyone else can chime in here.
1995 FZJ80 w/ 237k miles
The issue I've been having for quite some time is during cold start, there is a horrendous squealing sound while idling. It is extremely loud and is a relatively high pitch as well. It is particularly loud when the temps are colder and the truck isn't warmed up yet. The noise is still definitely there, but is a little quieter once the truck is warmed up. One thing to note is that the noise almost completely disappears when you put the tranny into Drive. It makes the noise when you are idling in park and neutral, but not drive. The only time you can hear the noise while the truck is moving is when you are coasting to a stop and the RPMs drop back to idle.
Over the past 2 weeks I replaced quite a few of the parts that were looking worn and rough. These new parts include an OEM toyota thermostat, aisin water pump, aisin blue fan clutch, CSF 3-Row alumn radiator, and OEM drive belts.
I know the sound cannot be the water pump, clutch fan, belts, or idler pulleys. I know it cannot be the alternator idler pulley because I removed that completely roughly a week ago and did not put it back into place when I installed the new belts. The noise also cannot possibly be the lower AC idler pulley because there is currently no belt even attached to the AC compressor or the pulley. I am currently waiting on a new Denso compressor to come in so that I can replace that as well so the AC belt is currently not even installed. The reason I am replacing the AC compressor as well is because there was considerable wobble and a grinding noise when I spun it by hand with the belts removed. I thought the AC compressor was the culprit making all the noise, but it turns out it cannot possibly be the source of the noisy idle because the AC compressor is currently not even being driven by a belt. Also I inspected the alternator pulley with the belts off and there was no noise or wobble when spun freely.
I am beginning to suspect that the Harmonic balancer/damper is my noisy culprit. The fact that the noise only happens at idle and goes away when I put the truck in gear, thus changing the RPMs, makes me think the harmonic balancer is faulty. Also the trucks idle has become more and more rough over time, along with the noise getting louder and louder.
So with all the information I have gathered, can my fellow mudders confirm if the harmonic damper is indeed the suspect?
If the harmonic balancer is indeed the issue. Will I have to remove nearly everything that I just replaced(belts, fan, and rad) in order to replace that as well?
I am currently in the process of trying to upload a video so that all of you could listen to this wonderful noise at idle, but youtube keeps saying that an "error occurred", but I will upload the video asap.
Thanks for your time and thanks for the responses in advance!
1995 FZJ80 w/ 237k miles
The issue I've been having for quite some time is during cold start, there is a horrendous squealing sound while idling. It is extremely loud and is a relatively high pitch as well. It is particularly loud when the temps are colder and the truck isn't warmed up yet. The noise is still definitely there, but is a little quieter once the truck is warmed up. One thing to note is that the noise almost completely disappears when you put the tranny into Drive. It makes the noise when you are idling in park and neutral, but not drive. The only time you can hear the noise while the truck is moving is when you are coasting to a stop and the RPMs drop back to idle.
Over the past 2 weeks I replaced quite a few of the parts that were looking worn and rough. These new parts include an OEM toyota thermostat, aisin water pump, aisin blue fan clutch, CSF 3-Row alumn radiator, and OEM drive belts.
I know the sound cannot be the water pump, clutch fan, belts, or idler pulleys. I know it cannot be the alternator idler pulley because I removed that completely roughly a week ago and did not put it back into place when I installed the new belts. The noise also cannot possibly be the lower AC idler pulley because there is currently no belt even attached to the AC compressor or the pulley. I am currently waiting on a new Denso compressor to come in so that I can replace that as well so the AC belt is currently not even installed. The reason I am replacing the AC compressor as well is because there was considerable wobble and a grinding noise when I spun it by hand with the belts removed. I thought the AC compressor was the culprit making all the noise, but it turns out it cannot possibly be the source of the noisy idle because the AC compressor is currently not even being driven by a belt. Also I inspected the alternator pulley with the belts off and there was no noise or wobble when spun freely.
I am beginning to suspect that the Harmonic balancer/damper is my noisy culprit. The fact that the noise only happens at idle and goes away when I put the truck in gear, thus changing the RPMs, makes me think the harmonic balancer is faulty. Also the trucks idle has become more and more rough over time, along with the noise getting louder and louder.
So with all the information I have gathered, can my fellow mudders confirm if the harmonic damper is indeed the suspect?
If the harmonic balancer is indeed the issue. Will I have to remove nearly everything that I just replaced(belts, fan, and rad) in order to replace that as well?
I am currently in the process of trying to upload a video so that all of you could listen to this wonderful noise at idle, but youtube keeps saying that an "error occurred", but I will upload the video asap.
Thanks for your time and thanks for the responses in advance!