i have a 74 comet gt with a 302 in it. today i was driving it to a cruise in and the engine sounded like the mains were rattling in it or thats what i was told it sounded like is there a quick fix with out a rebuild right now
Its possible that it snapped the oil pump drive.Do you have an oil pressure guage in it??? Did it make noise the whole time it was running or only on start up???If its just one main thumping under load...as long as your oil pressure is good and you dont beat on it, it will be fine for a while.If it rattles and bangs like a po'ed cat in a garbage can...Its time to take it down and re build/replace it.
A loose Main Bearing is a powerful dull thud or knock that take place regularly every other revolution. The knock can be confirmed by disconnecting the plug wire next to this cylinder. The knock would be less audible. Loose Rod Bearing is a metallic knock that can be heard the loudest at about 30 mph. The knock can be reduced or eliminated by disconnecting the plug wire to this cylinder. Loose Flywheel is a thud or click which is usually irregular. To test, idle the engine fast and shut off the ignition. If a thud is heard, the flywheel is loose. Loose Piston Pin is a sharp double knock which is usually heard when idling. Severity of knock should increase when the plug wire is removed to this cylinder.
Sure it wasn't "pinging" from too low octane gas? If the octane is too low, usually regular, and too much timing, it will make a noise most people call "pinging", but actually sounds like a rattle. A main usually will make a thud sound like Mavman72 said. One way to tell, is to take an old wooden broom handle or a dowel,with the engine running at idle, and place it on various places toward the bottom of the engine, while placing your ear on the other end. Sometimes it helps to close off your other ear. By moving the handle around you can hear the different sounds inside the engine, and if one place sounds a lot different, you have found you possible problem. You might need a helper to change the RPM's of the engine to make sure. Good luck!
thanks for the info. the noise that i hear is only there when i let off the gas coasting when the car is at opt.temp the noise goes away if i give it a little gas idk does that make any since.
