timing belt tension(searched)

[bogusfile]

I just replaced the timing belt and water pump on my 2000 4runner, and I seem to be getting a droning noise from the front of the engine. The noise is quiet enough to were it may just be my paranoia after performing the T-Belt swap(first time), but I thought I'd run it by the Toyota Gods before I deem it fully repaired. The crankshaft/pulley bolt is torqued down to 220ft lbs and there is no visible wobble. The original T-belt felt really tight compared to others that I have dealt with, and the replacement was quite a task to get on. All of the marks line up perfectly, and the motor runs smooth so my guess is that the belt is over tensioned. I reinstalled the tensioner without compressing the piston and holding it with a pin(no press available). The bolts were long enough to just install it as is, and I assumed that the timing belt tension would compress the tensioners piston into it's cylinder thus equalizing the pressure on the belt/tensioner. Bone head move in hindsight... but reasonable in theory. There is no rubbing either.

So can a new timing belt just be a bit noisy at first?

 

[bogusfile]

Another odd thing that I'm not sure if I should be too concerned about is that the belts markings that line up with the cam gears notches and the timing gear on the crank have moved several teeth to the left of their original placement. These marks were aligned before and after the tensioner was reinstalled so I am not sure what to think about their relocating. The marks I made with white out on the cam gears remain at top dead center when the crank pulleys notch is at TDC so I am assuming that the motor is still "in time", but it appears as though the belt itself has moved. Is this normal? Thanks in advance...

 

[Stick Figure]

are you sure the tensioner did compress? Maybe it is damaged and causing excessive tension. You should be able to compress these in almost any bench vise. I know factory instructions say to keep them vertical, but i've never had a problem do them in a vise. Or of course it could be nothing at all, but its hard to say w/ out being able to hear/see it.

 

[bogusfile]

It's possible, as there was quite a bit of corrosion/dirt built up on the near the tensioner.
Could I access the tensioner by simply removing the A/C compressor/bracket, or do I have to pull everything apart again? Thank god you only have to do this every 60-90K miles.

 

[CO_FlyFisher]

Thank god you only have to do this every 60-90K miles.

Sorry to tell you this, but you DON'T have to do the T-Belt that often on the 3.4l. A) It is a non-interference engine so chances of something getting hurt if the belt breaks are slim (usually breaks at start-up), and B) the factory belts seem to be pretty darn well made and don't tend to wear much.

Many people go WAY past the T-Belt change interval without any problems (I have almost 160k on my original now). You can easily get away with this if you inspect it regularly and just make sure the belt isn't obviously worn and that the water pump isn't leaking. I have yet to hear of anyone's T-belt breaking on the 3.4l.

 

[bogusfile]

I know I could have gone a bit further, but it was the original T-belt and it had 135K miles on it. It had moderate cracking and there were signs of corrosion underneath the water pump... so I figured it was a great time to do it.

 

[LINY4Runner]

the reason the 5VZ t-belts don't wear as much or as fast as others is because there isnt much space left on the belt between pulleys. It's a fairly short route from one pully to the next, and that is the major cause of the longevity of the 5VZ t-belts


just wondering, did you ever find the "cure"?

 

[bogusfile]

the reason the 5VZ t-belts don't wear as much or as fast as others is because there isnt much space left on the belt between pulleys. It's a fairly short route from one pully to the next, and that is the major cause of the longevity of the 5VZ t-belts


just wondering, did you ever find the "cure"?

I think the cure was the realization that I am being paranoid. It runs great, and the timing is still dead on. It's just a bit noisey.... which seems to be a trait of this motor anyways.

 

[004Gunner]

The noise is most likely from the idler pulley but I wouldn't worry it about until it sounds terrible, like a dying animal or Fran Drescher having an orgasm

 

[peter78]

The noise is most likely from the idler pulley but I wouldn't worry it about until it sounds terrible, like a dying animal or Fran Drescher having an orgasm

OK, you got me on this one. I hate it when someone tells a joke and you have to go and look up the punch line.

http://en.wikipedia.org/wiki/Fran_Drescher









Oh, OK, I get it now, very funny..........:lmao: :lmao: :lmao: