This is exactly what I'd be worried about in trying to get it redone now (with no evidence of a leaky HG). You might be even worse off.

 

I would have had a hard time reusing two of mine

 

Yeah I like the getting a warrenty in writeing specificly saying he didnt use the bolts as directed. No harm no faul but C.Y.A. 3.0 are known to blow outa the factory brand new pretty much I wouldnt want to give it any other excuses to blow.

 

I reused mine around 120,000 miles ago(22re).

 

I'm looking at my FSM as I type. Neither the 22RE or the 3VZE head bolts are marked with a black diamond as non-reusable parts, thus by default they are reusable, according to the 1990 4Runner Repair Manual (Engine, Specs) for USA and Canada
.

Does anyone actually have any solid reason to beleive that the 3VZE head bolts are TTY, or is this just what you heard from your buddy at the pub or read on YT?

I highly doubt the FSM is wrong.

 

Thanks, Matt16.

At least SOMEBODY, besides me, knows how to read their FSM!!! IT TELLS YOU WHEN THEY NEED REPLACED!!!

I'VE RE-USED MINE 3 TIMES WITH NO ISSUES!!!!!!(The last 2 HG's haven't blown!!!)


retards.....

 

Just like a hippy to show up after the fact and try to claim credit.... But what do I know im retardedededed =(....

 

You're right, good catch: http://personal.utulsa.edu/~nathan-b...68cylinder.pdf

I like how on page 77 it says "If any one of the bolts does not meet the torque
specification, replace the bolt." How are you suppose to know that before it breaks?

 

KILL THE HIPPIES!!!!

I'm on your side there...I HATE hippies...talk about retarded...

 

My manual (haynes truck/4runner 84-95) does not say anything about the 3vze head bolts being TTY either. I do however think they should be replaced if possible whenever you do the head gaskets or take the head off for any other reason. A few reasons why: Its cheap insurance and easy to do while you have everything apart anyways. It is a good idea to make one of the old head bolts a chaser to clean out the threads in the block. I'm not a mechanical engineer like OutlawMike, but I am a geotechnical engineer and we all take the same mechanics of materials courses. The article he posted has some very good information in it and it mentions that non TTY bolts will still strech. Yes, they can be re-used and most will probably not have any problems if they are properly cleaned before re-use. However, the bolts will be subjected to the static clamping force, as well as dynamic loading due to the differential heating/cooling rates of the head/block. Over time this stress will fatigue the bolts. I'm not saying it will lead to catastrophic failure, but it can contribute to a failure. If the bolt is over torqued a little bit this condition can result :


By sloth767, shot with iPhone 3GS at 2010-02-05

The repeated loading and unloading of the bolt/stud can cause some permenent set (necking) over time. Chances are that this is going to be extremely miniscule and probably in reality will not effect the performance of the bolt provided the bolt/bolt hole are clean and don't provide any torsional resistance. Other factors such as quality control of the bolt (i.e. the % of carbon, etc.. in the bolt) come into play as well. Again, chances are the bolt will be just fine. However, even slight deviations in the composition of the bolt/ stud can affect the performance of it on the stress-strain curve. Most people might think that re-using the bolts/ studs is no big deal. Again, I concede that the majority of the time they will hold fine provided all other factors are within spec. You might think it is overkill, but to an engineer it is an extra factor of safety against failure. Just my 0.02 cents. Sorry for the rant, i'm not a writer and am generally terrible at expressing my thoughts in a clear and concise manner.

 

I have a copy of a TSB from Toyota that says the bolts ARE REUSABLE.

Here's a link to it.

http://www.mts.net/~bayhear/4runner/...m%20Toyota.pdf

 

WOW!! Thinking about it now , the only place ive ever seen it mentioned is on vendors web sites selling head bolts.
http://www.store.partsdinosaur.com/product248.html




I guess you can reuse them, ive done it on a few 22re , but never on a 3.0 .
just dont trust using the old ones on this engine to much hassle.

But i guess you guys are right , they can be reused.

personally i wouldnt on a 3.0 ..

 

well i believe i'll still replace mine...it's cheap insurance LOL

guess this goes into the "don't believe everything you hear on the net" basket lmao

 

x2 !!!!

 

You're supposed to have such superb visual acuity as to spot such a weakness in the re-used fastener before attempting to install it.

Trust me though...I find that as laughable as you do.

I just don't believe that they've been "under-engineered" in any way. I used a torque wrench to roughly gauge the final torque values(last 90 degree turn) the last time I put my heads on. I was getting a final torque of ~116(+/-2)ft.lbs. for each bolt, which doesn't seem like all that much for a metric grade 10.9 bolt of that size to me. Anyway, I don't find myself worrying about breaking one or having one fail in service...but, we'll see I guess!

 

Initial hubble telescope, wrong lens.

 

I'm pretty sure one of my head bolts is toast- as when checked the torque on it after a couple thou after install, it basically just kept turning as I tried to dial in the last couple ft-lbs... I guess I should probably have replaced that bolt. Sounds like its in the stretching phase right before it snaps. Bugger. But its been many thousands of miles since though. I wonder if I could get away with it if I replaced that one bolt- would it be best to back off all the bolts a bit, then install the new head bolt, and tighten them up all together?

 

Bonus points for reusing the bolts in the same hole.

Any new bolts I'd definitely follow EB's bedding in procedure.