Any dirt, grease, or rust can cause friction and make it difficult to turn the crankshaft. Make sure to clean all surfaces thoroughly before attempting to turn it.
The bearings are the components that allow the crankshaft to turn smoothly. Make sure to lubricate them with a high-quality oil or grease.
If the crankshaft is not properly aligned with the other engine components, it can put undue stress on the bearings and make it difficult to turn. Make sure to check the alignment and adjust it if necessary.
Anything that is blocking the crankshaft from turning can cause it to bind up and make it difficult to turn. Make sure to remove any obstructions, such as tools or debris.
When turning the crankshaft, apply pressure evenly to the wrench or tool. Do not try to force it, as this can damage the crankshaft or other components.
Make sure to turn the crankshaft in the correct direction, as indicated by the manufacturer. Turning it in the wrong direction can damage the engine.
By following these steps, you can make it as easy as possible to turn a crankshaft by hand.