Hiya, I have a '93 GT Starlet and there is a slight knocking noise that seems to be coming from the area of the pulley that comes off the crankshaft... it isnt incredibly loud more of a tap and the engine seems to be running alright but I am worried!! Can someone please give me some ideas?!!! Thanks
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big end bearings( lower engine rod bearings to confuse) knock at idle and get louder with rpm
if the noise changes with rpm and you are hearing it near the ac compressor then it could be the ac pulley bearing
test if it is the compressor by listening and then turning the ac off the pulley will still spin but the compressor stops
if the noise remains , replace the pulley bearings
noises are difficult to track but since your's is on top, try this-CAREFULLY use a wooden handle (from a broom, or paint roller extension) and place the end against items on top of the engine-the other end, your ear. Be aware of the moving pulleys and the belt, take your time-you can isolate the noise this way, and plan your next step.
yoy could have a bad t belt tensioner or bad t belt pulley. get this looked into right away. you have what is known as an inteference engine. if you lose that belt for any reason, it WILL drop a valve, and your're looking at a lot of money for an job.
pullys have bearings and the bearings will go bad. what you need to figure out is what pully is makeing the noise and replace said pully. another problem you might have is the power steering pump. check the fluid level to make sure it's not low or dry. when a power steering pump goes bad it makes some noise. another possibale problem is if the car has a/c. the a/c compressor has an internal clutch that will make a grinding noise when it goes bad. To test this start the car turn you a/c on or your defrosters on and listen for the noise in the lower front area of the engine compartment (usually the lowest front pully). shut off the car and look for metal shavings on the pully. for this you should take the car to someone to evacuate the system so you don't release refridgerant into the atmosphere (it is also very flamable) and will need to be oiled with 134a oil and recharged after the repair. hope this helps.