mickg Posted January 23, 2005 Share Posted January 23, 2005 My '94 Owner's Manual lists two maintenance schedules: A & B. Timing belts are listed for replacement at 60,000 mile intervals, but only under Schedule A (extensive idling, low speed driving, police, taxi or door-to-door delivery use). Interestingly, replacement is not called for AT ALL under Schedule B, which defines all other driving styles. I have to then believe that with routine inspections, my timing belt should last at least until the water pump gives out, and then the job becomes worth the cost and effort. If rupture of the TB resulted in catastrophic failure of the Gen I engine, surely this would be noted in the maintenance schedule. gen1 (90~94) & gen2 (95~97) are all non-interference engine. gen3 (98+) are VVTi which is an interference type to get more horse power.90~96 is recommended to change TB at 90K, but for 97 and up, lexus factory recommends 120K or 7-year whichever comes first. ← Quote Link to comment Share on other sites More sharing options...
silvermate Posted January 24, 2005 Share Posted January 24, 2005 I have to then believe that with routine inspections, my timing belt should last at least until the water pump gives out, and then the job becomes worth the cost and effort.If rupture of the TB resulted in catastrophic failure of the Gen I engine, surely this would be noted in the maintenance schedule. yeah thats what throws the TB, when the water pump seizes/fails. its pretty rare for the belt to break on its own, they are extremely ridged. the Gen 1 LS400 is a non-interference engine, its a fact.........end of discussion. Quote Link to comment Share on other sites More sharing options...
027922 Posted January 27, 2005 Share Posted January 27, 2005 For what it's worth...my 90 LS at 133k developed a slow coolant leak at the water pump. Along with the pump I had the timing belt replaced - it was the first time the belt was replaced. Quote Link to comment Share on other sites More sharing options...
99lsguy Posted January 27, 2005 Share Posted January 27, 2005 I have to then believe that with routine inspections, my timing belt should last at least until the water pump gives out, and then the job becomes worth the cost and effort.If rupture of the TB resulted in catastrophic failure of the Gen I engine, surely this would be noted in the maintenance schedule. yeah thats what throws the TB, when the water pump seizes/fails. its pretty rare for the belt to break on its own, they are extremely ridged. the Gen 1 LS400 is a non-interference engine, its a fact.........end of discussion. ← Agree again and again A buddy of mine has a 97 Coach edition w/ 120k+ and has no trouble with TB. If I don't hear any "growling" from the WP I'm not going to change it out either ---should get 120K+ w/ no problem Just keep an occasional eye on her for any leaks & ears open........... Quote Link to comment Share on other sites More sharing options...
JPI Posted January 27, 2005 Share Posted January 27, 2005 Guys and Gals, Let's clear something up shall we? Just remember one thing. Anything with VVT-I is interference engine. JPI Quote Link to comment Share on other sites More sharing options...
99lsguy Posted January 27, 2005 Share Posted January 27, 2005 Guys and Gals, Let's clear something up shall we? Just remember one thing. Anything with VVT-I is interference engine. JPI ← Absolutely Quote Link to comment Share on other sites More sharing options...
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