Tundra engine recall - interesting news

It’s a girdle - not individual caps.

 

It's possible for 2 things to be true at the same time. Toyota could have found debris making the engine problem worse AND Toyota could also have a design flaw on the bottom end of these motors

 

Wonder if this wasnt a design issue, more of a bad tolerances issue. Ive been running my 11/21 build truck on +6.5psi over stock for about two years now...hasnt blown up under the added stress of additional boost. Id imagine that a design flaw wouldve popped up by now at 34k miles, of which 75% of those have been under additional stress. This would align with some trucks making it past 100k w/o incident and others blowing up a few hundred/thousand miles in.

 

But to be fair - the oil reports indicate something is brewing - would you agree?

 

BOOST

now thats more fun to talk about, not all this bullshit speculation

 

You would have to assume that its an indicator of a problem to say that is correct.

If silver is in fact used in the bearings, then MAYBE....but we dont know why silver is at that level, where its coming from, and if its an indicator of something.

 

If it were a Design issue, my gut reaction is to think failures should really start piling up since 2022’s should average 3 years, 36k miles now. Or is that a bad assumption?
I’d think that one piece girdle would be stout, stroke is long and flat though.
Based on the hanging chads in Ryan’s tear-down I can see debris that size being an issue. Unreal it could have gone unnoticed for so long but once a process is locked in, it becomes gospel.

 

I don't think that is a bad assumption, its just as good if not better than a lot of other speculation BS here

They have sold more then 400K of these things now I think and the if it was a significant design flaw, common sense says, and it's not unreasonable to think there would be WAY more failures at this point. Keep in mind, even not all of the recalled trucks have crapped out, in fact as near as anyone can figure here, it's a very small amount out of the 100K recalled.

so, it just all speculation at this point, only toyota has the numbers and three things are 100 % air tight fact

1) nobody here knows the exact amount of trucks failed
2) nobody here knows the failure rate
3) only toyota knows any details other than whats in the NHTSA report.

boost on

 

Incorrect again. They are individual caps. I worked at Toyota Powertrain dept for 25 years. Unless they changed their v6 engine design within the last year and a half. There is a lower oil pan girdle, but the mains are individual caps.


This thread has turned into a mess. Too much speculation & misinformation. Just makes it worse. Those that want to jump ship because it's (presumably) sinking. See ya!

 

Didn't say you did.

Should I have gotten your approval first? The last thing wanted here is that someone got their feelings hurt.

 

I think boathauler is correct, it's a large stout girdle , not individual caps. Its actually a beast from what I have seen.

and yes, they changed the design, this motor is more undersquare than a cummins diesel I have read for example

thats why we get 479lbs at 2,400 rpm out of a 3.4, I like it now that I own one, and I m a die hard V8 dude

 

Then I apologize if I'm wrong. It's been a few years, and there's a couple versions of that same architecture.

 

I think we have to factor in dealer rebuilds here. 3rd engine, rebuilt twice at the same dealer? Unless these are complete long blocks that have failed I’m not sure we can point every short block rebuild to a design issue. Does it suck in the end? Absolutely. Should a customer have to deal with it? Absolutely not. Sadly, as others have said, we can’t necessarily trust the dealer to do a top-notch rebuild.

My thoughts are they’ll kill any V35A product off first before a new engine. To me it doesn’t make sense to spend the R&D money on a new engine with the electric push coming.

 

no worries man, it happens

here is an interview with the actual guy who designed this thing.

https://www.youtube.com/watch?v=1XdaccfMxn4

check out the combustion efficiency details

 

Just turning there now, eh!? lol.

I think this shows the girdle.

 

You were so confident when you told me I was wrong though… twice.

 

I am, I worked on those engines for years in machining. Sometimes it's hard to keep up with the changes. And, it has been almost two years.

Anyway, carry on, I'll just sit over here & watch the rest of the shenanigans.

 

I'm not a mechanical engineer, but I have built a few engines.

I question the girdle design concept over individual main caps. It seems to me that a large stout girdle would make it much more difficult to get consistent torque specs on each individual main bearing. Not to mention the incredibly precise specs that the entire girdle would have to be built to.

Then again, my engine building experience is with old '80s V8 iron, not the modern aluminum stuff.

 

I’m in the exact same boat. (See what I did there) I come from a world where the 4 bolt main caps are individually machined to match the crank - the caps aren’t interchangeable in either direction or position. They are individually marked regarding their location and orientation to maintain proper clearances. I can’t imagine that same level of precision being achievable with a one-piece design.

 

I’d love to see any version of a V35 that has individual mains. This isn’t something that’s changed in the last few years.

 

as long as that boat has a blown v8 on it in warm climate, HA

 

We have some NA boats too!!

 

Exactly, every cap has a specific location on the crank. I'm sure you've had your fair share of time using plasti-gauge, too.

 

@AZBoatHauler, you are correct and I was mistaken about the main caps. The one I was thinking & most familiar with was the GR 3.5 that was used in sienna, Avalon, camry & highlander. I do remember seeing a few of those early version V35 for Tundra, but it was just the block only. We did some CMM measurements on those for another plant. My mistake again. I sure don't like misinformation, especially if I'm the one full of it!

 

wow, way to man up, rare these days

nice to see, nothing wrong with being wrong, as long as we can admit it.

 

yup, when this thing goes boom, like I told you before, we can drop that in here and it will rumble

 

Agree - appreciate it @Raven67

 

Here's one for you.

 

Pontiac 389?

 

Yep! 66 GTO, 4 speed as well.