Yobroe

When I got mine done, it was about $330 out the door and I had them do all the other belts too.

theryanator

I believe that the one on the used 994runner I have was done at 90k. When I bought it (at 136k) the dealer said the belt had another good 10k on it before I needed to replace it, does that sound right?

Also, what is the difference between a interference and NON interference motor? From what I gather it has to do with the chance of damage you could sustain if your T-belt snaps before replacement???

Thanks!

E1

I vote non-interfearence. I do not think the 3.4 is, and only someone who has busted on may know since there is conflicting info out there? But to back up the no it is not argument I submit:
http://autorepair.about.com/cs/doity...mingbelts6.htm

rimpainter.com

A timing belt basically tells the cam(s) when to open and close the valves in conjunction with the piston position, among other things. When the belt breaks on certain engines, the timing (in some cases the valve "head" and the piston top are very close) becomes completely random. After a break on an interference engine, at some point the pistons - which always maintain the same stroke - will end up hitting valve heads, which have now completely lost their normal "command" from the cam(s) in relation to the piston position.

In summary, the valves will smack the piston heads, bending or breaking them (and other parts).

What we are obviously trying to figure out is if this will happen on the 5VZ engine.

X-AWDriver

I wonder if even anybody on this board has broken a belt since they'd know for sure.

Mickdady

I haven't heard of it, but someone must have taken a head off at the very least!

MTL_4runner

When I did my timing belt I rotated the cams at TDC (by accident at first...but then I wanted to see for myself if something would happen should my belt ever break....ok, call me a curious engineer) and mine did not touch (at least there was no interference I could feel.....there may be a very, very small interference, but given what I have see and heard, I am quite confident that it was non interference). Now I don't guarantee that all Toyota 3.4L motors 96-02 are non interference, but I highly doubt they are unless they changed designs mid-production.

http://www.theautoshop.com/timing.html
http://autorepair.about.com/cs/doity...mingbelts6.htm

I think the other Gates chart has an error on it:
http://members.aol.com/rtclapp/tbelt.pdf

I don't hink Toyota has made an interference motor at all since the early 90's....except for the new 4.7L

vandert

Did mine in the old t100 at 127,000. No problems but was getting nervous

T

bamachem

like i said, if you know what you're doing, have the tools ready, then YES, you CAN do it that quick. cut the old belts, remove the fan and the timing belt cover, cut the old belt off, set the tensioner, put the new belt on, release the tensioner, replace the cover, replace the other belts and tension them, then replace the fan. if you have an electric fan, then you can shave another 10 minutes off that.

i installed my SC (first time i ever even SAW a TRD SC in person) in 2.5 hours in my garage by following the installation manual that came with it and reading each step twice before i attempted it. most dealers want to charge 6 to 8 hours for that job @ $80/hour. i did it w/ a ratchet and a few sockets and reading the directions in less than half that time.

if a dealer says that a timing belt takes 2.5 hours according to their chargable time, you can BET that they have a tech who can do it in 1 to 1.5 hours - easily.

Tacotex

Looks like the motor will just stop w/o damage. Still can't believe that someone out there hasn't run one till it snapped, but then again anyone that reads this forum is likely to change the belt before that happens...I wouldn't be surprised if they lasted 150k+ from the looks of the last one I replaced at 100K
https://www.yotatech.com/forums/f2/timing-belt-snap-55222/

ACPlayer

I just changed the timing belt, waterpump, thermostat and the three serpentine belts this past weekend. 89,969 miles.

3.4v6

my stealer told me i needed to change mine at 50,000 ... i dont think so ... the car i still basically new.

4RUNR

Not a credible source.

Not a credible source.

Jared Ajlouny

oh really? he knows more about toyotas than ANYONE here!

midiwall

I agree with you in principle, but know that there are quite a few Toyota Master Mechanics here. Plus some folks that have just as much background, street smarts and training, but not the official Toyota paper.


Past that...

4RUNR, while it looks like the Gate's document has been shown to be wrong, do you have a credible source that extends beyond certified master mechanics?

4RUNR

I can certainly dig up something directly from Toyota regarding this, as I did regarding the 4.7, but since the 3.4 interference theory goes against a long established notion that the 3.4 is a non-interference engine, the burden of proof so to speak I think lies with the crowd that speaks otherwise.

https://www.yotatech.com/forums/show...t=interference

Not a good track record for Gates.

midiwall

Many folks here have called Toyota dealer service and they've said that the 3.4L is a non-interference engine. I'd say that's pretty directly from Toyota.


And Gates has since updated their chart regarding the 4.7 (to say thats it's an interference engine). I agree that their 3.4 listing is still wrong.

MTL_4runner

You saw from what I posted that they had conflicting charts so I would say the Gates chart is crap. Find me another publicized source that shows that the 3.4L is an interference engine. All the other sources I found concurred that it was non-interference.

Jared, I appreciate you were responding to the fact that someone called friend's dad "not credible" but I doubt the truth of your statement quite a bit. Surely you must see how funny what you said, sounds.

"My friend's dad knows more about Toyotas than anyone on Yotatech".
....c'mon now.

Lance

$$
I guess I can't complain about $220.00 for Timing belt, water pump, all drive belts and an oil change from a Toyota dealer mechanic.

bamachem

wow, that's not bad at all...