This is my proof that the tundra 5.7 liter has a timing belt
The 5.7 uses a timing belt
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flc2006
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The pictures tell the tale, just wonder if it was an accident or an "$accident$ ", and right at the pivitol new model intro time too.........
We will all know in a few days when we are standing in line at the grocery store and see the National Enquirer, they will have the true facts or either blame it on outer space aliens.
We will all know in a few days when we are standing in line at the grocery store and see the National Enquirer, they will have the true facts or either blame it on outer space aliens.
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How about this who cares
I allready know it's a chain Sano pictures from Detroit proves that...
I allready know it's a chain Sano pictures from Detroit proves that...Great info file, where did you get it? off the net or some other source? I would like to see all the files on this engine.
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Sanosuke pictures on his cut a way shows this..
When that chain stretches and wears out (all of them do) you'll wish you had a timing belt. The guides wear out. The chain tensioners go bad. Long chains in overhead cam V8's stretch like mad. They slap around like crazy after awhile. Not now............5 years from now.
Chains were great when they were a foot long and drove camshafts in pushrod engines. These newer 5 foot long chains in overhead cam engines don't last like shorter chains did. When they stretch (all of them do) you lose 10 or 15 degrees of cam timing. Belts don't stretch. Belts don't fail if you replace them at the proper intervals. You can replace a 4.7 timing belt in an afternoon. Not bad for ~ 100k miles of service that you get from a belt.
Give me a belt any day.
Chains were great when they were a foot long and drove camshafts in pushrod engines. These newer 5 foot long chains in overhead cam engines don't last like shorter chains did. When they stretch (all of them do) you lose 10 or 15 degrees of cam timing. Belts don't stretch. Belts don't fail if you replace them at the proper intervals. You can replace a 4.7 timing belt in an afternoon. Not bad for ~ 100k miles of service that you get from a belt.
Give me a belt any day.
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I heard the Ford F150 uses a timing rope.
Austin,
sure and My hot sauce was made In New York City
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The chain on the 1FZFE generally last the life of the engine (300k+ mi), no noticeable noise. The 3URFE (5.7l) has two timing chains, one for each bank of cylinders, I bet they will do fine and last a very long time.
I respect your opinion, but the jury is still out on the 5.7. It's too new. Timing chains on a 22r Toyota were usually "clapped out" at around 150k. The guides would break. The chain would slap around and eat a hole in the timing cover coolant passage if you ignored the slapping chain for long.
Then there's the loss of performance issue with a stretched, but not necessarily failed timing chain. A glass reinforced belt never stretches more than a degree or two. A timing chain on its last legs will be stretched/worn so that the cam timing is 15 degrees or more retarded from factory specs.
Some of you trade trucks every 3 years or sooner so you couldn't care less.
I keep my stuff 20 years or longer.
I'm not knocking you at all. I'm just saying.........
To the average motoring public a truck due for a timing chain or a timing belt is ancient history. A slick talkin' salesman dude would rather trade you out of the truck as you show up for your 90k timing belt change at the stealership.:td:
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Yeah, I don't buy new trucks when the warranty runs out, my last truck was a FZJ80 w/200k miles, and my current FZJ80 has 125k. In fact on the Ih8mud 80 series forums, I have only heard of one timing chain problem, and a few guides that needed replacing, there are alot of active owners w/200k-300k miles on their rigs. I wouldn't doubt that Toyota has learned from their past and is making an even better timing chain system now.
This is not true. Belts do strech, especially if it takes many years to reach the 90K mile interval.
As said above, a chain is supposed to last the life of the vehicle as long as the engine is properly maintained.
Just curious where you are getting your information from. Belts do stretch, and belts can also snap or warp.
The 22R engine design is ancient compared to the 3UR. The 3UR is based on Toyota's UR engine design, which is brand new. The 2UZ 4.7L is based on the UZ engine design, which dates back to 1989 with the LS400.
All of Toyota's new engine designs use chains. The V6 GR engines have chains, and all the V8 UR engines have chains too. The GR and UR engines are also being used on Lexus vehicles.
Just because engines of other makers may have had chain problems, or the fact that the 22R had chain problems, does not mean that the UR will have chain problems.
Several of Toyota's older engines had certain flaws and problems that have been corrected and taken care of in Toyota's new engine designs.
Dual timing chains greatly add to durability and reliability. Mercedes Benz has utilized dual timing chains in some of their engines before, to great success.
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Funny post. I like how people think toyota made a mistake and wrote the manual wrong instead of an advertisement
As for reinforced belts not stretching....even the chain will stretch. Almost every material has an elastic range. Usually it will bounce back in this range, but if it's subjected to higher stresses.......or over longer periods of time it will go beyond that and have a new limit called permanent set. I guarantee that belts do this. Are you going to notice? Doubt it, but it can cause failure over time. Some people have been incredibly lucky and changed their belts at 100K +, but I'm not chancing it. As for the chain, It has a less likely failure and can go beyond 90k. To each his/her own, but I'll stick with the actual Toyota manual when it comes to settling the debate:tu:
As for reinforced belts not stretching....even the chain will stretch. Almost every material has an elastic range. Usually it will bounce back in this range, but if it's subjected to higher stresses.......or over longer periods of time it will go beyond that and have a new limit called permanent set. I guarantee that belts do this. Are you going to notice? Doubt it, but it can cause failure over time. Some people have been incredibly lucky and changed their belts at 100K +, but I'm not chancing it. As for the chain, It has a less likely failure and can go beyond 90k.
To each his/her own, but I'll stick with the actual Toyota manual when it comes to settling the debate:tu:
Toyota engineers were smart enough to install a chain to spin the cams in the 381 HP 5.7L V8 motor. I love the no maintenance and durability of a chain driven camshaft. Yes, it's a DOHC design with a total of 16 intake and 16 exhaust valves, 32 valves total. Anyone who buys a new Tundra WITHOUT this jewel of an engine under the hood is crazy. That motor alone makes me want to purchase the truck. SWEEEEEET!!! This engine is Lexus smooooooooooth and blows away the competition.
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Just a clarification on things...chains do not technically "stretch"...the pins and rollers that hold the links together get grooves worn in them over time. The result is that the wear will allow the links to extend to a longer length over time, as opposed to "stretching", which kind of implies that the chain would return back to some fixed length or that individual parts in the chain have gotten longer. You can "stretch" metal if you get it hot enough and put enough pull on it.
Belts, on the other hand, may actually stretch in the sense of the word....I don't know that they do. The material they are made out of would seem to be more likely to have the ability to stretch in length as opposed to metal.
Chain failures, as noted in this post already, are typically due to worn gears or failed tensioners. GM and other manufacturers used lots of nylon gear setups in the '70's and '80's in an effort to keep down the noise and these gears are very prone to failure. The 3.8 series motors up through the late '80's were notorious for chain failures. You would drop the oil pan and pick out what was left of the nylon coating on the gear. They would get into the oil pump pick-up and make a mess.
Belts, on the other hand, may actually stretch in the sense of the word....I don't know that they do. The material they are made out of would seem to be more likely to have the ability to stretch in length as opposed to metal.
Chain failures, as noted in this post already, are typically due to worn gears or failed tensioners. GM and other manufacturers used lots of nylon gear setups in the '70's and '80's in an effort to keep down the noise and these gears are very prone to failure. The 3.8 series motors up through the late '80's were notorious for chain failures. You would drop the oil pan and pick out what was left of the nylon coating on the gear. They would get into the oil pump pick-up and make a mess.
a side note here......
on motorcycles,...you have to adjust your chain every 100-1000 miles depending on riding style,.... then replace at 5-20k miles depending on the care.
harley's have belts that need changing every 30000 mile or so and do not need the adjustment as they dont stretch as much as chains do..
just something to think about.
its all comprimise,...my race bike i adjust about every 200 miles and replace every 5k...
my street bike i've had bikes with 30K miles with the original chain.
on motorcycles,...you have to adjust your chain every 100-1000 miles depending on riding style,.... then replace at 5-20k miles depending on the care.
harley's have belts that need changing every 30000 mile or so and do not need the adjustment as they dont stretch as much as chains do..
just something to think about.
its all comprimise,...my race bike i adjust about every 200 miles and replace every 5k...
my street bike i've had bikes with 30K miles with the original chain.
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I do not believe this correlates to timing chains/belts.
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