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Q: engine noise ? on 1994 Ford Taurus

Rookie cbe0621eac06868b3efe0d8d1d3611e23c60d3114864ea2ec19a68cfbd3eebab
my car seems to make a engine bearing noise at higher rpms and at starting, how do i know if its bad bearings or a oil pump problem
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Ensure the engine oil level is correct and ensure the noise is not related to anything external to the engine ( I would remove the fan belt to illuminate the source of the noise being external not internal). In either case oil pump or bearing failure the crank case oil pan needs to be removed to inspect the pump and rod and main bearings. If the crankshaft is scored or damaged the engine will need further dis assembly to repair the crankshaft.
I had a blown head gasket replaced and the engine was running well until I started to hear a knocking noise.
Does thiis mean I have a Main bearing problem ? Or, can this be a lose fiting or something?