VGR Posted April 3, 2004 Share Posted April 3, 2004 My 1991 LS400 has 101,000 miles and the timing belt has never been changed. I was wondering if it might be possible to get another 25,000 - 50,000 more miles of life out of the belt if I drive mainly on the highway and without a lead foot? Anyone here ever get 125,000 or more miles out of their V8 timing belt? Anyone ever break their timing belt in under 125,000 miles? Quote Link to comment Share on other sites More sharing options...
93LSOwner Posted April 3, 2004 Share Posted April 3, 2004 I bought my LS when it had 146,000 miles, Third owner. The second owner bought it when it had 84,000 miles. The first owner leased it. But anyways, the belt was changed at 120,000 miles by the second owner. Now, I don't know if it broke or not, the owner was a real estate agent so she did a lot of traveling, and she wasn't broke neither. lol. So, I guess it is possible to get to 125,000 or even more. Quote Link to comment Share on other sites More sharing options...
mapman Posted April 3, 2004 Share Posted April 3, 2004 Mine had around 140000 when it was replaced. Original owner did everything to the car but the belt. Mechanic said I was running on borrowed time when I changed it Quote Link to comment Share on other sites More sharing options...
HRP Posted April 3, 2004 Share Posted April 3, 2004 Not replacing it electively ain't worth it!!! You know it will fail at the worst possible time under the worst possible conditions (one of Murphy's Laws) and if more than one thing goes bad, they will go bad in the worst possible sequence and combination. I'm sure there is a +50% built in durability factor, but why gamble? Quote Link to comment Share on other sites More sharing options...
VMF Posted April 3, 2004 Share Posted April 3, 2004 did mine myself at 125k, one of the t-belt bulley bearing has gone bad Quote Link to comment Share on other sites More sharing options...
1990LS400 Posted April 3, 2004 Share Posted April 3, 2004 The timing belt on my the 90 LS I had was damaged (I don't remember it actually breaking) at about 80,000 miles when the water pump seized. I always replaced the belt (and related parts and the water pump) per the maintenance schedule to avoid the hassle of having it fail on a long trip. Quote Link to comment Share on other sites More sharing options...
ThunderRiver Posted April 3, 2004 Share Posted April 3, 2004 Water pump? Lexus uses oil cooling for the engine, not water... Also, I am wondering if there is a way to check the timing belt, so that I can be more prepared for replacement? Quote Link to comment Share on other sites More sharing options...
1990LS400 Posted April 3, 2004 Share Posted April 3, 2004 Water pump? Lexus uses oil cooling for the engine, not water... ThunderRiver, Lexus and most modern engines - now even Porsche's flat 6 opposed - are water cooled. The oil provides lubrication of moving parts. Quote Link to comment Share on other sites More sharing options...
VBdenny Posted April 4, 2004 Share Posted April 4, 2004 Well actually you are both correct. Both the oil and the coolant provide cooling, although the oil cools differently. Thunder may be thinking about old V W engines that were air cooled. In my opinion air cooled engines are great for lawnmowers, generators, and pressure washers. They are terrible in cars, especially in the winter. I froze my butt off in the winter in my dads VeeDub as the only heat came off the exhaust manifold or something. Quote Link to comment Share on other sites More sharing options...
SRK Posted April 4, 2004 Share Posted April 4, 2004 Oil provides a cooling function in both liquid and air cooled engines. But the cooling effect is more for particular components, like bearings and pistons, than for the block, which absorbs most of the heat. Consequently, engines are either air or liquid cooled, as they do about 80% of the cooling; the oil cooling function is assumed. Quote Link to comment Share on other sites More sharing options...
91ls400 Posted April 4, 2004 Share Posted April 4, 2004 I had my belt changed at 154000, at the local toyota shop, the guys didnt comment on the belt but couldnt believe the car had 154000 miles on her! Quote Link to comment Share on other sites More sharing options...
jzz30 Posted April 4, 2004 Share Posted April 4, 2004 well if the belt breaks you dont have to worry about the engine (internals ) being damaged so thats one good point but well you also could be stranded some where for a while so well do what you got to do. Quote Link to comment Share on other sites More sharing options...
chips229 Posted April 4, 2004 Share Posted April 4, 2004 Hi after speaking to a lexus fitter here in the uk,i was told by him that it will damage my engine if the belt breaks,he said a lexus cam belt is the only one to buy as its alot better belt than aftermarket belts and will last longer,he said a lexus belt is safe for 100,000 miles.. Quote Link to comment Share on other sites More sharing options...
acf Posted April 7, 2004 Share Posted April 7, 2004 Meaning you have an interference engine in your '91. There have been numerous threads here about what years are interference and which aren't. I'm not sure the mystery was ever solved. Quote Link to comment Share on other sites More sharing options...
ThunderRiver Posted April 7, 2004 Share Posted April 7, 2004 1990LS400, Well, I know what you meant by most conventional cars rely on water cooling. But I tell ya. In my 1994 LS400, I don't see the water pump. There is no place for me to fill in water... Last time the car was in Houston for check up, they added oil, not water. My dad and I were surprised too.. but there is no water pump in my car. For the past 7 years, we never added any water either. The only water is the windshield fluid that I bought at gas station.. Quote Link to comment Share on other sites More sharing options...
SRK Posted April 7, 2004 Share Posted April 7, 2004 My dad and I were surprised too.. but there is no water pump in my car. I know that you believe this, but I would advise keeping an open mind on the subject of your car's cooling system. Perhaps go to the dealer and ask them to simply show you where the coolant resevoir is, and how to top it up. For the sake of your engine. Quote Link to comment Share on other sites More sharing options...
wandawoods Posted April 7, 2004 Share Posted April 7, 2004 1990LS400, Well, I know what you meant by most conventional cars rely on water cooling. But I tell ya. In my 1994 LS400, I don't see the water pump. There is no place for me to fill in water... Last time the car was in Houston for check up, they added oil, not water. My dad and I were surprised too.. but there is no water pump in my car. For the past 7 years, we never added any water either. The only water is the windshield fluid that I bought at gas station.. http://www.lextreme.com/timing.htm review this article by moderator VFM (hosted by lextreme), and you will know where the water pump is. actually it's burried inside the front of the engine, you can't see it without disassemble engine front end. that's why water pump is usually replaced when timing belt is changed. sorta killing 2 birds with 1 stone. u don't want to pay the labor (easily 6~8-hr times $60~$80 an hour) 2nd time just to change water pump or timing belt. Quote Link to comment Share on other sites More sharing options...
chips229 Posted April 7, 2004 Share Posted April 7, 2004 Thanks for the link above,im finding out alot more on here than on the uk site :) Quote Link to comment Share on other sites More sharing options...
LinuxFan Posted April 7, 2004 Share Posted April 7, 2004 I am nearing this very expensive repain on my 91 and even though I would rather avoid it, I know it is a necessary work at 102k miles. Here is my concern -- I searched this site and have found no comments on how to know when you need to change your belt. Is it only dependent on the amount of miles on the vehicle/belt, or is it possible to wear to the level where it needs to be replaced before a specific mileage? thanks Quote Link to comment Share on other sites More sharing options...
1990LS400 Posted April 7, 2004 Share Posted April 7, 2004 Meaning you have an interference engine in your '91. There have been numerous threads here about what years are interference and which aren't. I'm not sure the mystery was ever solved. Which years have interference engines is not a mystery - at least not to me and the owner of the independent repair shop to which I usually take my LS. I hope that at some point a permanent link to an authoritative web page with this information can be posted on this forum. What really is a mystery to me is how so many Lexus dealer employees are not knowledgable about their cars. This morning I took my 2000 LS to the dealer for warranty work with one of the issues being related to the day-time running lights. Two service writers were adament that my car could not have a problem with the running lights because my car does not have them. I know that one of the two service writers had been with the dealership for quite a long time. I had to show them the page in my owners manual that explains how the day-time running lights work before they would believe me. Kind of sad. Quote Link to comment Share on other sites More sharing options...
wandawoods Posted April 7, 2004 Share Posted April 7, 2004 I am nearing this very expensive repain on my 91 and even though I would rather avoid it, I know it is a necessary work at 102k miles.Here is my concern -- I searched this site and have found no comments on how to know when you need to change your belt. Is it only dependent on the amount of miles on the vehicle/belt, or is it possible to wear to the level where it needs to be replaced before a specific mileage? thanks TB itself should last 120K, but to be safe, replacing it at 90K is recommended by Lex dealers nowadays. however, seized water pump can break the TB regardless age or mileage, that's another reason why you should change water pump while replacing TB. u don't want an old water pump to break your just-replaced TB. in fact, while you are at it, changing the pair of disbributor caps/rotors is not a bad idea either since they need to be apart in the process of changing TB according to local Lex dealers here, GEN 1/2 IUZFE engines in LS4/SC4 are non-interference engine, meaning no bent-valves if TB breaks. Quote Link to comment Share on other sites More sharing options...
acf Posted April 7, 2004 Share Posted April 7, 2004 Gen 3 starts at 2000 correct? Quote Link to comment Share on other sites More sharing options...
mobilyte Posted April 7, 2004 Share Posted April 7, 2004 message deleted Quote Link to comment Share on other sites More sharing options...
acf Posted April 7, 2004 Share Posted April 7, 2004 While we're on this topic, I'm getting ready to do mine. What parts should I replace? I know the actual belt of course :D and the water pump. Which other parts? Money is of course always a factor so I'm having my brother-in-law help me. Also, where's the cheapest place to get OEM parts? Must the water pump be OEM as well? Quote Link to comment Share on other sites More sharing options...
wandawoods Posted April 7, 2004 Share Posted April 7, 2004 http://www.lextreme.com/timing.htm lextreme page does have the part list at the begining of article by moderator VFM. rotors/caps/wires/plugs are really optional, but you may choose to do them at the same since all of them need to be unpluged or disassembled in the process. in fact, I would recommend to change out the thermastat and it's gasket too. thermastat is cheap, and it will cost a lot of time or labor to replace it alone. also, remember to go to toyata dealer to get two gallons of long-life red OAT coolant and two gallons of dis-stilled water for 1:1 mixture. essentially a coolant flush-n-refill job is part of whole 9-yards too! Quote Link to comment Share on other sites More sharing options...
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