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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Yes, the 2UZ-FE (4.7L) does use a timing belt. But we're talking about the 3UR-FE (5.7L) which uses a timing CHAIN.
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Toyota went to Timing Chains for one Major Reason:
FORD
The 'mentality' the Toyota Service Departments were being subjected to by whiners having to replace a belt at 90 thousand miles [ incredible by most standards ] and of their FORD F-150 blah blah....... so...... Timing Chains.
These 5.7 engines are being knocked out at 150 thousand units a year by what I recently read.
Once someone has one apart - I'd like to see what it will take to mod a 5.7 block to fit under 4.7 heads 'n belts - cause I don't much like chains on cam drives this big.
The D4 heads are much bigger than the Port Injection versions.
A 5.7 shortblock 'n Intake with Belt Drive would suit my needs to a =T=.
FORD
The 'mentality' the Toyota Service Departments were being subjected to by whiners having to replace a belt at 90 thousand miles [ incredible by most standards ] and of their FORD F-150 blah blah....... so...... Timing Chains.
These 5.7 engines are being knocked out at 150 thousand units a year by what I recently read.
Once someone has one apart - I'd like to see what it will take to mod a 5.7 block to fit under 4.7 heads 'n belts - cause I don't much like chains on cam drives this big.
The D4 heads are much bigger than the Port Injection versions.
A 5.7 shortblock 'n Intake with Belt Drive would suit my needs to a =T=.
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Nice blowen up picture me and Sano took at Detroit Either way you look at this people I admire Toyota for using a chain in the all new Tundra Long lasting is something worth gaining having a Belt is a pain in the butt for the service department and costly for us customer's paying for the repairs on new cam seal's water pump etc...
Erik
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805 Posts
Toyota has 42 years experience with chain driven overhead camshafts. In fact, from 1965-1978 all of Toyotas overhead cam motors were chain driven. Then from 1979-1997 Toyota displayed a preference for timing belts. Then begining in 1998, Toyota moved back to prefering timing chains.
Toyota has also changed its preferences in regards to hydraulic valve lifters.
Prior to 2005, Toyota used hydraulic valve lifters on only two engines. But since 2005 Toyota has been using a roller rocker arm / hydraulic valve lifter type valvetrain on all of its new engine designs.
Toyota has also changed its preferences in regards to hydraulic valve lifters.
Prior to 2005, Toyota used hydraulic valve lifters on only two engines. But since 2005 Toyota has been using a roller rocker arm / hydraulic valve lifter type valvetrain on all of its new engine designs.
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look in your owners manuel if you still need convincing
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805 Posts
The Scheduled Maintenance Guide is the right place to look and here is what it says:
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I just one to say that timing chain and all recent chain which is precision manufactured will not stretch like before.
Japanese chain manufacture can now pin the chain very precise so that it is 90 deg dead on to the link now! This precision made the chain will not stretch any more. Chain now lasts 10 time more than before do to this preciseness.
Chain will last more than engine life now do to this. Dose everybody understand this reason?　Recent manufacture went back to chain so that it will be more maintenance free. Saves owner's money.
Pin and Roller will evenly engage to the sprocket so that it will not stretch any more.
Not precise chain will have uneven contact so that it will wear out prematurely.
Japanese chain manufacture can now pin the chain very precise so that it is 90 deg dead on to the link now! This precision made the chain will not stretch any more. Chain now lasts 10 time more than before do to this preciseness.
Chain will last more than engine life now do to this. Dose everybody understand this reason?　Recent manufacture went back to chain so that it will be more maintenance free. Saves owner's money.
Pin and Roller will evenly engage to the sprocket so that it will not stretch any more.
Not precise chain will have uneven contact so that it will wear out prematurely.
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Another non-value added thread that mis-leads a lot of folks.
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Interesting, then why can't I have one for my dirtbikes?
MXSJW:
I just wanted people know "WHY and what changed in new chain" that last much longer than old times.
I don't think that's funny so it is not a Joke.
Please don't comment stupid and low quality question like that. If others know what I don't know I will appreciate very much for the person taking time to tell me. I don't think that you have a common sense. I should not even comment in this forum. I don't care much now about other people being stupid. I should not even tell you about following information. Stay stupid MXSJW. Please don't read my comments.
Of course Chain must be used in clean and well lubricated environment.
Oil bath environment is best environment for chain and ball bearing.
Grease lubrication in the chain, gear and ball bearing is not as good lubrication as compared to oil bath lubrication.
If chain is still giving you problem under optimum condition, it is under rated for the loads. Also shock loading is very bad for any mechanical device Gears, shafts, chain, bearing, etc. If there is a shock bigger size components will be much better than small but it also gets much heavier so there is a trade off in mechanical design.
I guess people don't care about real and good knowledge anymore.
I just wanted people know "WHY and what changed in new chain" that last much longer than old times.
I don't think that's funny so it is not a Joke.
Please don't comment stupid and low quality question like that. If others know what I don't know I will appreciate very much for the person taking time to tell me. I don't think that you have a common sense. I should not even comment in this forum. I don't care much now about other people being stupid. I should not even tell you about following information. Stay stupid MXSJW. Please don't read my comments.
Of course Chain must be used in clean and well lubricated environment.
Oil bath environment is best environment for chain and ball bearing.
Grease lubrication in the chain, gear and ball bearing is not as good lubrication as compared to oil bath lubrication.
If chain is still giving you problem under optimum condition, it is under rated for the loads. Also shock loading is very bad for any mechanical device Gears, shafts, chain, bearing, etc. If there is a shock bigger size components will be much better than small but it also gets much heavier so there is a trade off in mechanical design.
I guess people don't care about real and good knowledge anymore.
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3,521 Posts
The 5.7 is not listed here because it does not use a belt like the other 40 post have mentioned Import Part Locator It does use a serpentine like the picture in the original post! this link is kinda like asking a oil company who makes the best oil but does come from a reputable company, http://www.gates.com/file_display_common.cfm?thispath=Gates/documents_module&file=MTZ.pdf
It does use a serpentine like the picture in the original post! this link is kinda like asking a oil company who makes the best oil but does come from a reputable company, http://www.gates.com/file_display_common.cfm?thispath=Gates/documents_module&file=MTZ.pdf
MXSJW
I thought you are sarcastic. I'm sorry that I said stupid.
You really want chain for mud?
For a motorcycle DID is famous but Tsubakimoto is bigger company and they have more than 7 times in pure revenue than DID.
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In Timing chain they have 70% of japanese car share. 30% world share. It is also used by mercedes.
For a motorcycle chain I found this for you.
Tsubaki Motorcycle Chain - Motorcycle chains for on and off road, racing and street
XQR Chain may be used in abrasive and muddy conditions with little effect on chain life
Also DID offroad chain that have hard coating and Oring seals that retain oil inside for off road use.
X-Ring
I thought you are sarcastic. I'm sorry that I said stupid.
You really want chain for mud?
For a motorcycle DID is famous but Tsubakimoto is bigger company and they have more than 7 times in pure revenue than DID.
.
In Timing chain they have 70% of japanese car share. 30% world share. It is also used by mercedes.
For a motorcycle chain I found this for you.
Tsubaki Motorcycle Chain - Motorcycle chains for on and off road, racing and street
XQR Chain may be used in abrasive and muddy conditions with little effect on chain life
Also DID offroad chain that have hard coating and Oring seals that retain oil inside for off road use.
X-Ring
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569 Posts
Yes it is a chain driven on this one. Belts are definately quieter in the long run. Although chains are stronger than belts, they still will wear in the pivot points and eventially need replacement. The sprockets will also wear adding play. Regardless of the tensioner that keeps the chain slap to a minimum, the lengthening chain ( from wear ) will slowly affect valve timing ( same as a belt stretching ). This is more pronounced with long chains like on any overhead cam engines, as opposed to pushrod engines where the cam is very close to the crank. The longer the chain, the more pivot points, and the cumulative effect of these points adds up to more stretch in longer chains over time.
This all being said, don't worry, the chain should last a couple of hundred thousand at least. The earlier OHC Toyota engines came with dual row chains that were that much better, however in later years they went to single row ( probably to save money, I don't really think either chain design is any quieter that the other, and single row seems strong enough ). The diagram in the 5.7L shop manual appears to be a single row chain, also the sprockets are shown as being for a single row chain.
This all being said, don't worry, the chain should last a couple of hundred thousand at least. The earlier OHC Toyota engines came with dual row chains that were that much better, however in later years they went to single row ( probably to save money, I don't really think either chain design is any quieter that the other, and single row seems strong enough ). The diagram in the 5.7L shop manual appears to be a single row chain, also the sprockets are shown as being for a single row chain.
I would venture to guess that the Owner's Manual for a V6, 4.7 V8 and 5.7 V8 are EXACTLY the same.
By your logic, I could argue that any given Tundra has all 3 engines........
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Not too throw this discussion off topic. But according to some, these chains and belts are going to fail (chains due to longer length, belts due to material being used). Well then why are pushrod engines, like the Vortec 6.2 L V8 found in the GMC Sierra Denali considered so prehistoric?
According to Wikepedia, Pushrod engines have a less complex drive system when compared with OHC engines. Most OHC engines drive the camshaft or camshafts using a timing belt, a chain or multiple chains. These systems require the use of tensioners which add some complexity to the engine. In addition, failure of the timing belt or chain can sometimes result in the pistons colliding with the open valves, resulting in severe damage to the engine. Also, pushrod engines generally take up less space so the higher liter numbers does not seem to be too much of an issue.
A comparison of these two engines.
Toyota Iforce 5.7L V8 with VVT- 381 Horsepower @ 5600 rpm, 401 Torque @ 3600 rpm
MPG - 14/18 on 87 Octane
GM Vortec 6.2L V8 with VVT - 403 Horsepower @ 5,700 rpm and 417 Torque @ 4,300 rpm
Mpg - 12/19 on 87
Keep in mind, I own an 07 Tundra and love the 5.7 engine. Just don't understand why the pushrod design, although old, is so taboo.
According to Wikepedia, Pushrod engines have a less complex drive system when compared with OHC engines. Most OHC engines drive the camshaft or camshafts using a timing belt, a chain or multiple chains. These systems require the use of tensioners which add some complexity to the engine. In addition, failure of the timing belt or chain can sometimes result in the pistons colliding with the open valves, resulting in severe damage to the engine. Also, pushrod engines generally take up less space so the higher liter numbers does not seem to be too much of an issue.
A comparison of these two engines.
Toyota Iforce 5.7L V8 with VVT- 381 Horsepower @ 5600 rpm, 401 Torque @ 3600 rpm
MPG - 14/18 on 87 Octane
GM Vortec 6.2L V8 with VVT - 403 Horsepower @ 5,700 rpm and 417 Torque @ 4,300 rpm
Mpg - 12/19 on 87
Keep in mind, I own an 07 Tundra and love the 5.7 engine. Just don't understand why the pushrod design, although old, is so taboo.
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Wow, someone revived an old thread. In any case, all xR series motors are timing chain driven, and some xZ motors are belt (JZ, UZ) or chain driven (AZ, NZ, ZZ).
The UZ series engine was designed almost 2 decades ago for the original LS400, and to meet new Lexus standards for quietness, a timing belt was used on all UZ blocks. So when Toyota created a truck V8 for the Tundra in 1999, it inherited the timing belt design. So, the 2UZ uses a timing belt and ones with VVT-i are interference engines.
The thread discussion should've been over after the 3rd post and the PDF that was posted.
Of the Tundra's 3 available engines, 2 are timing chain driven, and only 1 is belt driven. The 4.0L 1GR and 5.7L 3UR (xR engine series) are chain driven, and only the 4.7L 2UZ, which is based off of a very old block design, is belt driven.
The UZ series engine was designed almost 2 decades ago for the original LS400, and to meet new Lexus standards for quietness, a timing belt was used on all UZ blocks. So when Toyota created a truck V8 for the Tundra in 1999, it inherited the timing belt design. So, the 2UZ uses a timing belt and ones with VVT-i are interference engines.
The thread discussion should've been over after the 3rd post and the PDF that was posted.
Of the Tundra's 3 available engines, 2 are timing chain driven, and only 1 is belt driven. The 4.0L 1GR and 5.7L 3UR (xR engine series) are chain driven, and only the 4.7L 2UZ, which is based off of a very old block design, is belt driven.
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