Cranking an engine with no oil has exceeding side part.
Operating an engine without oil causes extreme side factor and engine damage. The oil separates the moving parts; without oil, these parts rub against one another and create friction and heat. Oil is pushed through the system by the oil pump, preventing friction and heat from building up inside the engine.
Cranking the engine without oil causes the engine block to crack. Once the engine block cracks, water and oil can mix together creating a massive amount of heat to build up in the engine. The engine crack also will cause the other moving parts to jam in place, locking up the engine.
The pistons push up and down inside the cylinders of a car engine. One side effect of cranking an engine without oil is these pistons make contact with the cylinder walls, causing them to warp.
Crankshaft WearsThe crankshaft is the main part of the engine that engages once the ignition is turned. The ignition begins a process that finishes by turning the crankshaft, which engages the pistons. The engine then cranks to life and begins a process of each piston going up and down in a timing motion.
Cranking the engine without oil burns up the bearings that allow the moving parts to turn. The oil lubricates these bearings, preventing friction and heat. As the engine turns over, no oil is there to lubricate the bearings and the bearings wear down quickly. A worn bearing causes the moving parts to turn in an oblong position, causing the parts to rub against one another.
Once the cylinders warp, the shape of the cylinder is defective and, as the pistons push up and down, they will stick in place. Again, the engine will lock up and require complete replacement or rebuild.
A crankshaft that engages without oil engages the pistons harshly, causing damage to the piston connecting rod. This damage is dramatic and causes the engine to seize.