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Lexus LS Belt Tensioner Failure

My 2002 Lexus LS with a gasoline engine is throwing me a curveball. Mileage is at 170862 km. The belt tensioner seems to have given up the ghost, belt-handover no longer works. I suspect the tensioner itself is defective. Anyone seen this before?

A 2002 Lexus LS with 170,862 km is experiencing issues with the belt tensioner, suspected to be defective, causing the belt handover to fail. The tensioner arm appears seized, indicating a failure in the tensioning mechanism despite the pulley looking fine. The solution involved replacing the tensioner, which resolved the problem and restored normal engine performance.

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4 comment(s)

Belt handover not working? That's a new one on me for the LS. Are you sure it's not just the tensioner pulley or idler pulley that's causing the slack? I remember on my old Camry, a worn idler pulley made the belt jump like crazy.

Good point about the idler pulley. I've checked those and they seem okay. The tensioner arm itself isn't moving smoothly, almost seized. Is it possible for the tensioner to fail in a way that the pulley still seems fine but the overall tensioning action is shot?

Ah, if the tensioner arm is seized, that's your culprit. The pulley itself might look okay, but if the spring mechanism inside the tensioner is gone, it won't keep the belt tight. Best get it to a workshop.

Thanks for confirming my suspicions. I was hoping it was something simpler, but a seized tensioner makes sense. I had it replaced. Cost me 455€, but engine performance is back to normal.

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LEXUS

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