Bearing clearance is the distance between the crankshaft journal and the bearing surface. It is usually referred to as oil clearance, as that's what is occupying the space.
the clearance is measured at the top of the bearing with the help of a feeler gauge
There is no simple formula to calculate the metal bearing clearance. Manufacturers must specify the clearance for each individual bearing.
.0010" to .0020" oil clearance
For a complete guide on checking tilting pad clearance in journal bearing visit johncraneorion.com/literature/catalogs/catalog.pdf
A bearing backlash is what happens when the bearing loses motion or clearance. This tends to be caused by gaps that cause a period of non-motion.
the bearing which have adequate clearance in bearing housing to allow thermal expansion in the shaft, are called floating bearings M.Rafique Burero
You wouldn't want oil to be taking up part of your clearance and give a false reading with the plastigage.
.002" is what I have on a fresh rebuild.
If there were no operating clearance the clutch release bearing would constantly be in contact with the spring diaphragm causing wear on both the diaphragm and the bearing itself, also the bearing pushing on the diaphragm could cause the clutch friction plate to not be fully engaged and slip.
The main bearing and rod bearinging clearance is usually in the manual. However, if worse comes to worse, you can find it on your rods in the truck.
The clearance between a rod bearing and a journal typically ranges from 0.001 to 0.003 inches (0.025 to 0.076 mm), but it can vary depending on the engine design and application. Proper clearance is crucial for oil film formation, temperature management, and overall engine performance. Always refer to the manufacturer's specifications for the optimal clearance for specific engines.
Plastigauge