Loud scraping metal noise near the oil pan/ timing belt area
My 92 chevy silverado makes a loud scraping rattling scretching noise from the oil pan area and it clicks and gets loud when i give it some gas. eventually if i drive it long enough without turning it off it stops sometimes. the sounds happens all the time, when idling, in reverse, but its loudest when in drive. its not the exhaust, i just had new exhaust installed and ive sat there and rattled the pipes to see if i could get the same noise, no luck. if any one could shine some light on what might be the problem let me know.
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To narrow it down, while the engine is running, don't get near moving parts, you can use a long piece of steel, metal, put 1 end on the valve cover, the other to your ear and listen for rattling. You can move it around to narrow down the source of the noise. It's like a stethoscope but works well. I use a 3' long screwdriver.
Have you checked your oil? Sounds like you may have run it way low, the loud metallic noise is probably metal on metal contact inside your engine, add oil and it that fixes it, count yourself lucky, if not need to take it to a shop.
Hello there Its a Known problem with these engines..The lifters are usually the case to thes problem or the rocker arms are coming loose.Take off valve cover and start to find the bad one..Oil will leak over head but is the only way to pin point the problem.If the sound is a little lower in the motor It might have a sloppy rist pin in the cylinder causing the piston to slap the side walls..If it does it at an idle or under a load its the rist pin.If it does it at all different rpm and doesnt matter if its under load its the lifter area.Now the timing chain.Could case all thee above.So a way to check that is as long as you got the belt off grab a hold off the crank pulley and rock it back and forth.If you feel it grab a few inches side to side iits really loose and thats your problem.If it doesnt have much slop back and forth and turns the cam quickly the move on to the other parts I have stated.These steps will help you to solve the problem.I hope this helps you and good luck..Have a great after noon...