Hear a rattle when i push in clutch - 1998 Chevrolet S-10 Pickup

Whenever you hear a tap, rattle or thumping noise take to a mechanic or someone who knows cars you do not want to blow a rod through the block. It could be starting to freeze take it in!

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Check to see if the throw out bearing in the clutch is dry. Might need to replace it.

Sounds like a release bearing is going bad.

Attempt to adjust the clutch linkage. You might have too much play in the assembly.

If happens only when clutch is in, I would look at the throw out bearing. When clutch is in, the throw out bearing is in maximum effect pulling the clutch back. The bearing takes a lot of wear, so if very old or clutch been replaced without the bearing, I would suspect this as a area of trouble

replace through out bearing

Unfortunately, you can't really tell until you have the parts in front of you. If the clutch showed no signs of slipping in any gear, then the disk and pressure plate are probably ok. Throwout bearing troubles are usually heard as a sort of screech when the pedal is depressed. If the pressure plate is the type that has 3 fingers that are pushed by the bearing and one of the fingers was bent/broken, it would make a rattling sound. If the car has considerable miles, it might be worthwhile to replace the whole assembly even though the clutch itself seems to working well. Hope this helps!

Your throwout bearing may be nearing the end of its useful live. Your clutch may be in the same condition.

Please have this checked by your mechanic before any major damage occurs.

I would say it is your clutch (In your case it more than likely the throw out bearing if you hear rattle sound.) with the amount of miles and the year of the vehicle. Clutch plates, just like brake pads, eventually wear out. Consider yourself fortunate that you have gone this far without having to replace it.

throw-out bearing might be worn. or possible damaged flywheel.