2008 lexus es350 -- chirping noise from serpentine belt area. Chirping start after a bit of driving. Got belt replaced, mechanic says it is water pump (as he says he saw marking and could be a prior leak), but I don't want to do this trial and error. Any advice if I should replace water pump as it is expense on es350 and only to have chirping noise not fixed as it could be something else like alignment or idler pulley etc.
Idler bearings are very common, they can also reduce the timing advance, reduce power in the engine
Thank you, does it mean I need to replace idler pulley?
This is going to sound strange, But I use a large screw driver, with the engine running. carefully place the pointy end of the screw driver on mounting near the bearing, by placing your ear to the handle, carefully not to hit any moving parts for obvious reasons. the screwdriver acts as a speaker and any faulty bearings will stand out but it won't hurt to practice on a bearing easier to get to, no noise no problem, noise is a problem, the other way is to remove the belt and spin the bearing, good bearing spins smooth with no wobble, Bad ones don't, replace the bad ones only
After reading some of the suggestions, the air conditioner idea is a good one to check, by turning your air conditioner or climate control off will make a massive change to the noise, when the belt is off, just spin the bearing, if it is faulty you can change it without removing the compressor, just difficult
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SOURCE: Replacing water pump in 98 Lex GS300
Removal of the crankshaft front pulley/damper can be removed without any damage being caused to the cam belt.
They are a good fit on the shaft, I personaly use a lead tup, weighs 2lbs and will not damage anything if used properly.
Tap equaly all the way round the pulley, that should be ok.
SOURCE: 2000 Lexus ES300 - 45K
Are you sure this is a rattle or is it more of a creaking noise? I have a 2000 ES300 and had an issue when I would go over speed bumps and the noise would drive me nuts! However replacing the bushing in the top of the strut mount is expensive due to the labor involved.. Replacement of the strut or the bushing isn't necessary. Just open the hood, locate the strut housing and you ll be able to see the black rubber bushing in the middle. Obtain a can of Heavy Duty silicone aerosol spray and attach a straw to the spray tip. Using a flathead screwdriver wedge the screwdriver between the top of the bushing and the metal pushing the screwdriver all the way to the edge of the metal underneath the roof of the metal housing. Then pry the edge of the bushing away from the metal housing so that the top of the edge of the bushing exposed and stick the straw end of the silicone into the spot and spray generously. Only slight bushing movement will be obtained as the bushing is pretty stiff but it will be enough. Work your way around using this technique until you get the spray fully around the bushing 360 degrees getting it into the area between the edge of the bushing and the metal. Then spray the silicone onto the top of the bushing filling it all the way up until it spills over the metal. After it drains down, repeat again making sure you fill it above the rim of the bushing so it seeps into the area between the bushing and he metal housing (or frame) because this is where the rubbing is taking place that is creating that awful noise. Repeat on the other side and your done. The main goal is to get the silicone into the area between the metal and the bushing along the edge. This happens to be the way I was able to do it. This totally solved my problem and now the car is so quiet there aren't any knocking, creaking or rattling noises. This was a hard solution to explain without visuals, hope you can follow. This will work for sure. The Heavy Duty Silicone spray I used was manufactured by CRC and I bought it from Walmart.
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By the way, mechanic initially told me to replace belt, which I did by him and it did not fix chirping noise
Thx, does it mean I need to replace idler pulley?
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