[Jake Raby]

By the time an IMS Bearing will make any amount of noise its late at Stage 3 failure. It won't make noise long before it fails.

If you have an IMSB issue and you have noise, its already so late that foreign object debris has entered the oil system and has bypassed the filter at start up, creating engine- wide collateral damage thats silent.

Do a sump and filter inspection, but don't drive it again till you quantify that the IMSB is not failing.

Most IMSB failures never make any noise till the engine fails, you may have a bad water pump or something else wearing within the engine.