[Maks throdown]

I have a 1st gen tundra 4.7 390K miles and it's been the best vehicle I've ever owned, recently the altenator went out, I replaced it with a repurposed altenator, and threw in a new die hard battery and an oil change to boot, it ran great except it now had a squeally serpintine belt, I thought maybe just gotta break in the new altinator and the belt will get used to it there, then a week later I let it warm up about 15 mins to go bowling, came out and smelled burnt rubber and no more squeak, then realized battery light was on and no power steering, I knew the belt had broke, so thinking it must've been the old belt as it was the original serpitine belt still going at almost 400k miles, I replaced it with a new one, started it up, and immediately it started smokin and almost burned through the new belt before I could shut it off, so I checked all the components to see if they would turn by hand, the power steering pump turns fine, new altinator fine, top pulley fine, ac compressor turns fine and can tell the pistons are moving up and down when I turn it, I took off the tensioner pulley and the bearings were pretty worn out, though it did still turn, I replaced it anyway with a brand new tensioner pulley, put that same new belt back on, fired it up and SNAP went the new belt!! Now I'm thinkin somethin is locked up in there, maybe ac pump I thought, cuz they do product a squeally sort of sound when going out, although I haven't had any other symptoms of it going out, or any lower steering symptoms, although It does leak a little power steering fluid i can see all over the hoses and stuff, though in 5 yrs I've never had to refill the reservoir cuz its never gotten very low and has never given me any steering problems, does anyone have any ideas as to what is going on here and what i may need to replace??

 

[jgrauman]

If everything is turning freely by hand then I would suspect something is out of line or the belt is not routed correctly? The actual tensioner could have failed as well. Does it still move under tension?

 

[Maks throdown]

If everything is turning freely by hand then I would suspect something is out of line or the belt is not routed correctly? The actual tensioner could have failed as well. Does it still move under tension?

Well it's hard to say now cause it will burn right through a new belt soon as I start it up, it's like something is locked up, but far as I can tell nothing is, the tensioner is still strong and holds maximum tension, it gave good strong resistance when replacing the altenator and again both while installing g the new belt and while installing the new tensioner pulley, the one thing I'm not sure on is the ac compressor, the clutch wheel pellet that the belt actually goes on spins freely and when turn the main wheel of it I can feel the pistons moving inside and hear them pushing fluid through, so k assume that uts not locked up, I did suspect that when I installed the new altenator and the belt started squeaking that it could be slightly out of alignment, causing it to squeak, so I thought it would work itself out, instead it burned through 2 belts now, so u know if its possible for any of the components to turn by hand but at high speed like while running heat up and lock up or anything?? Although with the new belt it immediately started burning thfew the belt on startup, I've check the way I've routed it probably 10 times to make absolute sure its routed correctly, I'm stumped, thanks for your help also!!

 

[cheapskate]

Couldnt you pull some sort of fuse so you can roll the motor without actually firing it up? That way you can maybe have someone roll it over while you watch from under the hood and maybe see whats going on?

 

[Maks throdown]

Couldnt you pull some sort of fuse so you can roll the motor without actually firing it up? That way you can maybe have someone roll it over while you watch from under the hood and maybe see whats going on?

Hmm, I dunno, never heard of that, I'll definately have to look more into that, cuz if that's possible that's what I'll need to do, great idea, thanks

 

[cheapskate]

One caveat. My 05 tundra had the easy start feature so if yours does too maybe test this theory without a belt on it first.

 

[Maks throdown]

One caveat. My 05 tundra had the easy start feature so if yours does too maybe test this theory without a belt on it first.

What is the easy start feature?? I e never heard of it

 

[cheapskate]

When you roll the key to the start position you let go even before the truck starts and it will fire up and disengage the starter for you. You dont have to keep holding the key in the start position till it actually fires up. Not sure why only the Tundra's seem to have it but my 12 is the same. I'm not saying thats the technical name for it but thats how they work.

 

[Maks throdown]

When you roll the key to the start position you let go even before the truck starts and it will fire up and disengage the starter for you. You dont have to keep holding the key in the start position till it actually fires up. Not sure why only the Tundra's seem to have it but my 12 is the same. I'm not saying thats the technical name for it but thats how they work.

U know now that I think about it, I have before accidentally just bumped it a little and it went ahead and started anyway, I just thought I got lucky and it caught fire real quickly, that's cool, I'll have to try that out, thanks

 

[gonerydin]

Unplug the clutch harness on the AC compressor and try it again

 

[tundrus]

I like the idea of pulling a fuse (fuel injection, fuel pump?) and having someone crank it while you look to see what's not turning. Everything turns okay it's got to be a belt routing problem.

 

[Maks throdown]

Unplug the clutch harness on the AC compressor and try it again

Hey yeah that's a good idea, I'm gonna try it, thanks for the info yall!,,!

 

[Maks throdown]

I like the idea of pulling a fuse (fuel injection, fuel pump?) and having someone crank it while you look to see what's not turning. Everything turns okay it's got to be a belt routing problem.

Yeah I like that too, another good option I didnt think to do, I appreciate, I'll try this as well!,,!

 

[Fr8Hauler]

One possibility. Just turning by hand isn't placing tension on the system. Something may "jam" when it is all assembled.
My not be the case, have an buddy that the aftermarket alternator was off, what was short by a minuscule amount. Drove him nuts. Good luck.

 

[James777]

Seems your Trouble Started after you Replaced the Alternator, make sure you have the alternator bolts tightened,or you could have a Bad one, and check and make sure your serpentine belt is routed correctly

 

[perry.sebastian]

I will throw this out...I had back to back failures of the belt and idler bearing (within a couple thousand miles). After the 2nd failure I replaced the fan clutch too. Seems to be ok after 15k miles. I don't know for sure because the fan clutch did not really give an indication of a problem.

 

[James777]

Be sure to use OEM parts (Denso,Aisen) whenever possible

 

[Maks throdown]

Seems your Trouble Started after you Replaced the Alternator, make sure you have the alternator bolts tightened,or you could have a Bad one, and check and make sure your serpentine belt is routed correctly

Yeah I kinda suspected that myself, I haven't really checked it to close because it does turn by hand, not locked up, but I will check it out now that somebody else also suspected it be the altinator,, and like the other guy said I wonder if once it has a belt on and full tension moving at high speed some component could be locking up, but not by hand with no belt tension, I'm not 100% confident in the workings of the ac compressor and its clutch, so that's what I 1st suspected, I put on and took off the new belt 3 times and checked and rechecked to make sure its routed correctly, so it cant be that, I didnt really check the alignment of the altinator cuz I figured even if slightly outta line it woulda caused the squeally belt, but wouldn't completely stop it, but I suppose something could be wrong with it, though my truck never ran or started better than after I installed it and a new die hard, a way sorry dor the book I wrote ya, and thank all of yall for ur ideas, hopefully I can get this thing runnin this weekend...

 

[Maks throdown]

Then I can quit drivin this damn F-150 company truck who's transmission is a nightmare goin out, at only a little over 200K miles!! Ha that's just gettin warmed up for these tundras ain't it fellas!,,!