Jump to content

  •  

Photo

This Whole Timing Belt Change Thing At 90,000 Miles...


  • Please log in to reply
34 replies to this topic

#1 eddielasvegas

eddielasvegas

    Club Member

  • Regular Member
  • PipPip
  • 48 posts
  • Model: 1998 LS400
  • Location: Please Select

Posted 06 December 2007 - 01:34 PM

I have a '98 LS 400 with 82,000 miles which is why I started this thread here.

I know this has been discussed at length, but after reading much about the changing of TB's, I started thinking (that usually doesn't get me too far) about the Lexus recommendation of changing at 90,000 miles or 6 years.

What if the belt failed at 89,000 miles or 92,000 miles or 5.5 years? Is Lexus going to cover it under warranty? Of course not.

My point is, especially given this is such an expensive item, is that inspection may be be the key to maximizing the life of the belt and also not spending dollars on unnecessary maintenance. Maybe the belt tensioner and water pump makes this a moot point and these would need replacing before the belt anyway.


Any thoughts on this by others with way more Lexus seat time than me?


Eddie

P.S Does anybody know why Lexus used a belt versus a chain? Possibly a quieter engine or less power loss?

Have something to contribute?

Sign in or register to start a topic...

 

#2 VMF

VMF

    Guru Member

  • Super Moderator
  • 2,071 posts
  • Model: 1996 LS 400

Posted 06 December 2007 - 01:39 PM

you are right, quiter engine for the most part, i changed mine at 120k. the belt itself was just fine, but one of the pulley bearings started to whine. there is no warranty on the car unless your car is CPO and lexus recommends to change it at 90 while i would not recommend you to do so, all parts are still have a lot of life in them at this rather small mileage:) remove one of the covers and take a look at the belt, check if its cracking and if it is flexible. that should be pretty much it.

#3 Sanpete

Sanpete

    Club Member

  • Regular Member
  • PipPip
  • 44 posts
  • Model: 1998 LS400
  • Location: Please Select

Posted 06 December 2007 - 02:46 PM

It appears from the service records that the timing belt/water pump were done at 120K on my 98. The previous owner apparently felt it was worth the risk to wait. It's undoubtedly true that the chance of failure was small. But keep in mind that if your belt fails you'll likely have catastrophic engine damage. Though an inspection can see some problems, some mechanics say you can't always tell by an inspection how close a belt or pulley is to failure.

#4 VMF

VMF

    Guru Member

  • Super Moderator
  • 2,071 posts
  • Model: 1996 LS 400

Posted 06 December 2007 - 04:58 PM

1uzfe is a non interference engine, so there is going to be no catastrophic failure. your valves are not going to touch the pistons. all you going to have to do is to put the new belt up while keeping the timing settings.

#5 aarman4

aarman4

    Advanced Club Member

  • Regular Member
  • PipPipPip
  • 243 posts
  • Model: 1991 Lexus LS400
  • Location: Please Select

Posted 06 December 2007 - 05:02 PM

It appears from the service records that the timing belt/water pump were done at 120K on my 98. The previous owner apparently felt it was worth the risk to wait. It's undoubtedly true that the chance of failure was small. But keep in mind that if your belt fails you'll likely have catastrophic engine damage. Though an inspection can see some problems, some mechanics say you can't always tell by an inspection how close a belt or pulley is to failure.


The 1UZ-FE engine is a non-interference engine and will not destroy your engine if the timing belt fails.
Being a mechanic, I totally agree regarding the inspection. Although alot of time you can tell the condition of a belt by how flexible and "rubbery" it feels, you cannot see any cracks that are out of sight, or hidden against pulleys. the best inspection you can do without taking everything apart would be to do a check where you can see the belt, mark the spot you see with a small dot from a paint or grease pen, and then crank the engine and repeat the process, inspecting every bit of the way, until you always see a dot (one that you marked) every time you crank the engine.

Hope that helps!

#6 Sanpete

Sanpete

    Club Member

  • Regular Member
  • PipPip
  • 44 posts
  • Model: 1998 LS400
  • Location: Please Select

Posted 06 December 2007 - 05:27 PM

As I understand it, based on the reports here and elsewhere, the 98-00 engine is an interference engine. There is some controversy over whether the 95-97 is also an interference engine. I'd be glad to see some truly authoritative resolution of this, as I've seen "authorities" cited on both sides. I'd think the repair manual or an experienced Lexus tech would be good sources, if anyone has access to them.

#7 SRK

SRK

    Guru Member

  • Regular Member
  • PipPipPipPipPip
  • 1,515 posts
  • Model: GS400
  • Year: 1998
  • Location: Please Select

Posted 06 December 2007 - 06:42 PM

Lexus, like other manufacturers, plots the time-to-failure on the belts, and sets a point at which almost no belts fail as the interval. Of course many will go past that interval before failure - almost all of them in fact. That's no reason to ignore replacement intervals. Just because you miss an oil change or two doesn't mean the engine will blow up either. But we change oil regularly anyways.
There is no accurate or objective means of "inspecting" a belt. At the same time the belt in my 98 GS was obviously past it's prime at 100k kilometers, or about 62k miles. I changed it because the 7 year limit had been reached, and I'm glad I did.
I have changed hundreds of belts in my time. I have replaced belts that looked good, and many that looked terrible.
The Vvti engines are interference. Have one of them fail, and you'll be crying for weeks.....

#8 Lexuses71

Lexuses71

    Club Member

  • Regular Member
  • PipPip
  • 94 posts
  • First Name:Barry
  • Model: 1993 ES300, 1998 LS400, 1993 Acura Legend L Coupe
  • Year: 1998
  • Location: Please Select

Posted 06 December 2007 - 08:32 PM

Lexus, like other manufacturers, plots the time-to-failure on the belts, and sets a point at which almost no belts fail as the interval. Of course many will go past that interval before failure - almost all of them in fact. That's no reason to ignore replacement intervals. Just because you miss an oil change or two doesn't mean the engine will blow up either. But we change oil regularly anyways.
There is no accurate or objective means of "inspecting" a belt. At the same time the belt in my 98 GS was obviously past it's prime at 100k kilometers, or about 62k miles. I changed it because the 7 year limit had been reached, and I'm glad I did.
I have changed hundreds of belts in my time. I have replaced belts that looked good, and many that looked terrible.
The Vvti engines are interference. Have one of them fail, and you'll be crying for weeks.....


Thanks for this thread, it reminded me I need to do my belt/pump, which has been easy to ignore because I have such unusally low mileage for a '98 (under 34K). But last time I had a 5K service (about 3 mos ago), my mechanic, who I do trust, suggested I change TB/WP due to the time that has elapsed. He did a visual inspection, said it LOOKED OK from what he could see, but as stated here, you can't trust a visual inspection. Techinically speaking, I'm way overdue.

#9 VMF

VMF

    Guru Member

  • Super Moderator
  • 2,071 posts
  • Model: 1996 LS 400

Posted 06 December 2007 - 08:38 PM

agree with above, 2uzfe and 3uzfe are interference engines while 1uzfe engine, which was installed on LS models from 90 to 97 is a non-interference engine and belt failure is not going to destroy your engine

#10 etex

etex

    Advanced Club Member

  • Regular Member
  • PipPipPip
  • 100 posts
  • Model: 1998 LS400

Posted 07 December 2007 - 09:47 AM

What am I missing here, VMF? I never heard of a 2 uzfe or a 3 uzfe engine! What would you find them in?

#11 VMF

VMF

    Guru Member

  • Super Moderator
  • 2,071 posts
  • Model: 1996 LS 400

Posted 07 December 2007 - 11:07 AM

2uzfe is in 98-2000, and 3uzfe is in 2001-2006 models

#12 sbguy

sbguy

    Club Member

  • Regular Member
  • PipPip
  • 37 posts
  • Model: 1994 LS400 1998 LS 400
  • Location: Please Select

Posted 07 December 2007 - 01:00 PM

Let me add my 2 cents here! My 20 year old son is driving a 1999 ls 400 because some one didn't replace their timimg belt at 90,000 miles. It broke at 95,000 miles. It ruined the engine!! The owmer didn't have the money for a new engine. So he sold a perfect looking ls400 to me for 1500 dollars. I put in a low mileage engine from the wrecking yard for 5000 dollars. My son is very happy with his car.
Timeing belts can go for 100,000 miles or more!!But the can break early also!! Rare,I must agree!! But how much a gambler are you? That's the guestion ? Good luck!

#13 GKLCPA

GKLCPA

    Advanced Club Member

  • Regular Member
  • PipPipPip
  • 238 posts
  • First Name:Greg
  • Model: 1996 LS 400 SILVER
  • Year: 1996
  • Location: Pennsylvania (PA)

Posted 07 December 2007 - 05:26 PM

agree with above, 2uzfe and 3uzfe are interference engines while 1uzfe engine, which was installed on LS models from 90 to 97 is a non-interference engine and belt failure is not going to destroy your engine


Interesting. I was under the impression that 95-97 were interference engines.

#14 VMF

VMF

    Guru Member

  • Super Moderator
  • 2,071 posts
  • Model: 1996 LS 400

Posted 07 December 2007 - 05:32 PM

95-97 have the same engine as 90-94 LS, just a lil extra power, but no vvti

#15 GKLCPA

GKLCPA

    Advanced Club Member

  • Regular Member
  • PipPipPip
  • 238 posts
  • First Name:Greg
  • Model: 1996 LS 400 SILVER
  • Year: 1996
  • Location: Pennsylvania (PA)

Posted 07 December 2007 - 08:28 PM

95-97 have the same engine as 90-94 LS, just a lil extra power, but no vvti


thanks for the confirmation. i see you have a ls400 and an ls430. do you think there's a big difference in basic quality between the two? i know the 430 is more luxurious and has a few more bells and whistles.

Have something to contribute?

Sign in or register to start a topic...


Not what you're looking for?

Register now, we have a huge community of enthusiasts to answer any questions you might have