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Not correctthe 98-05 are non-interference.
I can personally vouch that you can turn the crank on a >>>pre-VVTI<<< motor all the way over by hand with the timing belt off. VVTI, that apparently is not the case.
ugh, why did I contribute to continuing this thread???
All 2uzs, regardless of model year or whether they have vvti or not, are technically interference engines. Toyota makes this very clear in the FSMs:the non VVT-i engines are non-interference so the 50 degree setting shouldn't matter, at least from a damage prevention measure.
That’s only after all the timing components are completely installed, and is simply a check to ensure the cams and crank are in fact in time with one another after turning 2 full revolutions. In contrast, the belt is installed with the cams and crank all advanced 50* clockwise, just as they are when removing the belt. Again, Toyota is very clear about why 50* advance is required in all of the FSMs: to prevent the piston and valve heads from making contact and causing damage.It does bear noting that you do end up rotating them back to TDC at the end of the job, leading me to believe that the 50 degree setting is just to allow the cam to rest at it's lowest energy state.
All 2uzs, regardless of model year or whether they have vvti or not, are technically interference engines. Toyota makes this very clear in the FSMs:
View attachment 3157269
However, for whatever reason, timing belt failure on the pre-vvti 2uzs is often not catastrophic. Perhaps @2001LC has a technical explanation for this, as I have yet to figure out why it’s rarely destructive on those pre-vvti 2uz engines.
That’s only after all the timing components are completely installed, and is simply a check to ensure the cams and crank are in fact in time with one another after turning 2 full revolutions. In contrast, the belt is installed with the cams and crank all advanced 50* clockwise, just as they are when removing the belt. Again, Toyota is very clear about why 50* advance is required in all of the FSMs: to prevent the piston and valve heads from making contact and causing damage.
That's good to know, the shop is currently opening up the car but did warn me that I will most likely need a new engine or a full rebuild after this.I don't know about the tensioner, but Aisin is OEM for the timing belt kit.
That's good to know, the shop is currently opening up the car but did warn me that I will most likely need a new engine or a full rebuild after this.
Just wanted to inform that AISIN is owned by toyota and also supplies parts to other car brands. However, the AISIN part comes in a TOYOTA box/package is far too superior to just a part made by AISIN inside an AISIN box. It is not a toyota scam to make more money. The engineering going into a AISIN part inside a Toyota box is very advance. I have experienced it on my lifetime of dealing with OEM parts and AISIN parts. I used AISIN T-belt kit because it is the next best part and I will replace it based on the years not miles.I don't know about the tensioner, but Aisin is OEM for the timing belt kit.
When engine interferes, it's valve(s) hit the piston head(s). It will not run or run very poorly at time of interference.This is a weird question but roughly 400 miles after a timing belt replacement on an 06 lx470 with 184k on it...maintained well and up to date just had apparent engine failure. One different mechanic said we can't crank the car and it sounds like valves are hitting or something. Timing tensioner is tight... belt in tact but they couldn't access the timing marks to see if they were off or not.
Good to know, Denso coils are the only part I haven't purchased from the Toyota parts counter.The OP asked, can the T-belt service lead to engine failure (failure meaning: not fixable, short of major rebuild of long block). In the VVT YES! by all accounts I've heard of. But I've never actually diagnosed a VVT failure, due to a bad T-belt service. But have had a Toyota Service manager tell me of a case, that happen in their shop. When a tech timed to the "T's". They bough client an engine. They would have surely scoped the cylinder before shelling $$$ out for and engine.
Aisin vs Toyota Aisin:
Aisin T-belt kit only has water pump and perhaps it's gasket, that are Aisin in side the box!
I have compared Aisin to Toyota Aisin. With parts like the Water pump, fan bracket and few others. In most cases, you can visibly discern a difference in the metal. Toyota is shiner almost like polished finish. IMHO reason is: Toyota is manufacture to a higher standard. That said they are both excellent parts.
Same applies to Denso. Some parts there is no difference, other there is. Denso (support) told me, yes Toyota in some cases, is manufacture to higher standard. But like in the case of coil (COP), we see Toyota's name ground off. Denso said: that's a parts Toyota gave Denso permission to sell in secondary market.
This is good info! Thank you.. they mentioned things are routed properly and lines up/tight but will keep digging...When engine interferes, it's valve(s) hit the piston head(s). It will not run or run very poorly at time of interference.
If run okay for 400 miles. I'd look very hard first at; Cam & Crank senors wires. The crank sensor wire is very often miss routed, and rubs on drive belt.
View attachment 3159124View attachment 3159125
If they check out. I'd pull both top t-belt covers, and check timing. If marks off, I'd scope the cylinders.
I've seen where a tech did not use torque wrench, or just forgot to tighten pulley bolt. Bolt was falling out and pulley wobbling. Me, I mark all bolts when torqued. No mark, I get out the torque wrench, regardless of what I think I did.
View attachment 3159117
I asked them for pictures i'll share hereYou need to stay actively involved. Ask questions, get answers, be on site, post here if you can. The whole thing still smells a bit fishy.