Rattling & squeaking coming from front end of motor..
I have a 1999 GMC Sierra 1500, 5.3L. I have had the Idler Pulley changed as well as Belts and the Tensioner Pulley is good. The engine squeaks as if there is a loose belt, when you depress the brake pedal and put it in gear a rattling sound comes from the engine. No one can seem to pinpoint the problem. Any ideas what it could be?
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Re: Rattling & squeaking coming from front end of motor..
I'm takin a stabe at this one, I think it may be coming from your waterpump. Use a long piece of metal or a pry bar and place it on any part of the pump that you can safely put it while the truck is running. Put your ear to the bar and you should be able to tell if it's coming from there. Good luck!
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It could be that the belt/belts are dry and worn out. It's also possible that you have a noisy idler pulley or belt tensioner. I have used, with great success I might add, some stuff called Door Ease. You can buy it at a hardware store and it looks like a stick of glue, but it's used to lube door hinges. Apply that to the fan belts when the engine is running. Please please please be careful doing this. I don't want any lost fingers... Anyhow, if the noise persists after thins I would suspect a pulley as the culprit.
Belts squeak for the same reason tires do when they spin. They are slipping. Something isn't turning as fast as the belt wants it to. On ford it's usually ether the idler sprocket or the tensioner. If you remove the belt and try spinning all of the pulleys by hand.( note the crank wont spin freely) you will usually be able to tell witch ones slipping.
If both belts are the same age it wouldn't hurt to replace both of them, spray them with a belt dressing before installing new belts. You can get this dressing at Autozone and possibly the belts too. Good luck.
Loosen the belts [ you do not need to remove] so they are free of tension to all pulleys.Start engine , if noise goes away either belts were too loose [ common on lx 450] or you have a worn & noisey pulley /bearing.have seen idler pulley below alternator have dry / noisey bearing.Otherwise if idler is ok it has to be another belt driven assessory , ac clutch,water pump & or fan clutch.Good Luck.