Loud rattle/knock in engine once engine has reached operating temp and transmission is engaged or other load is applied eg. a/c. It sounds like a big end knock but not sure.Sump is very hot as is tappet covers etc but temp gauge only reads about half way. oil level is ok.
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You didnt state vehicle however if the engine knocks the knock sensor will back off the timing thinking its detination not an actual knock if its knocking loudly stop driving it, something is going to let loose
If you have a spark knock on acceleration your timing could be over advanced or you can be at a too high operating temperature.First check the timing, with the vehicle in operating temperature place the transmission in park or nuetral with the parking brake engage Engine turned off..Remove the vacuum hose on the distributor and plug it.Connect the timing light.Disconnect the single wire near the distributor.Start the engine and bring it in operating temperature.Check the timing.Your timing should be at 10 degrees before top dead center
Now the temperature gauge is non op you need to make sure you are at operating temperature and not over heating. After a quick test drive turn off the engine and feel the radiator is there any cold spots that is causing the vehicle to overheat. You could have a plugged radiator.
Start the engine and let run until it reaches operating temp...next, run the transmission shift lever through all gears one by one and then return back to park. With engine running, pull out the transmission dipstick and wipe off. Reinsert the dipstick fully and pull out once more. Check the fluid level.