Low oil pressure, engine knock / noise.
Your question is very vague...is it how to remove bearings or how the replace bearings or how to size new bearings on an old worn shaft???? And what bearings??? There are several hundred bearings on a car...one kind of bearing on fishing reel...for or five bearings on a bicycle
go bak to scholl
There are three things that cause loss of oil pressure: worn-out oil pump, worn-out springs on the pressure control valves, and worn bearings. (Listed in order of expense to fix. Worn bearings means you've got to do an in-frame overhaul on your engine.)
Could be worn ball joints, worn steering linkages, worn/out of adjustment steering box and or worn/out of adjustment wheel bearings.
Worn engine parts. Rings, bearings, etc.
Worn Bearings
Usually caused by worn bearings.
Broken synchronizer, worn teeth, shift lever needs adjustment or bearings are worn.
Signs of worn crank bearings on a bike include unusual noises, excessive play in the crankset, and difficulty pedaling smoothly. To replace them, you will need to remove the crankset, extract the old bearings, clean the area, and install new bearings before reassembling the crankset. It is recommended to consult a professional mechanic for this task if you are not experienced in bike maintenance.
When you change rotor or main ball joint, or when they get worn.
Worn bearings from high mileage, poor maintenance, abuse,
The part of the the piston rod that connects to the crankshaft have worn out or come out of place.