What are the components of a Crankshaft?

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Components of Crankshaft:

Below are the components mainly found inside a Crankshaft.


Main journals:

The main bearing journals, or simply main journals, are clamped into the block and it’s around these journals that the engine rotates. All crankshaft journals are going to be machined perfectly smooth and round and sometimes hardened the main journals are secured into saddles, In which a replaceable bearing insert will sit. The bearing is softer than the journal and may get replaced because it wears and is meant to soak up small amounts of contaminants, if there are any, to avoid wasting damaging the crankshaft.


Connecting rod journals:

The rod journals are offset from the axis of rotation and are attached to the massive ends of the pistons’ connecting rods. Confusingly, they’re commonly also called crankpins or rod bearing journals. A feed of pressurized oil comes through an angled oil passage drilled from the main journal.


Crankshaft lubrication:

Metal-to-metal contact is that the enemy of an efficient engine, therefore main journals and rod journals both ride on a movie of oil that sits on the bearing surface.



The crankshaft is subject to strong rotational forces, and the mass of the rod and piston moving up and down exerts a major force. Counterweights are cast as a part of the crankshaft to balance out these forces. These counterweights give a smoother running engine and better RPM.


Crankshaft thrust washers:

At some point along its length, two or more thrust washers are going to be installed to forestall the crankshaft from moving lengthways. On the illustrated crankshaft, there are thrust washers on either side of the central journal. These thrust washers sit between machined surfaces within the web and also the crankshaft saddle – maintaining a specified small gap and minimizing the quantity of lateral movement available to the crankshaft.

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