Published on December 24th, 2020 | by Bibhuranjan


How to Care for the Engine Crankshaft

Wonder what keeps your engine running with the enhanced and responsive throttle that you duly receive from your engine? Relax, it’s the crankshaft that adds on to your horsepower’s.

Further, it also counts for one of the most essential auto parts to keep your car up and running. You can know more about Crankshaft here –

Thinking what? Why? Let’s have a look

What Is a Crankshaft?

One of the major parts that is responsible behind the overall movement in your automotive, Crankshaft is a moving engine component inside your internal combustion engine (ICE). The part caters to its main function for converting motion. The crankshaft serves the functionality of transforming linear motion of the piston into rotational motion. Mounted within the engine block, the crankshaft is connected to pistons via connecting rods.

Interestingly, this is how your car generates the required power, through the process of combustion that propels the fuel-air mixture. This power is further transformed into a rotary movement that occurs over the crankshaft. However, there’s one thing that needs to be noted.

In the entire process of conversion and transmission of power from one state to another, the crankshaft needs to go through a lot of pressure, making it withstand considerable loads over the entire process. On one side, the crankshaft takes severe bending, and on the other hand, this part inside your automobile needs to pick up on the torsional stress.

Further, there’s also an additional amount of load that arises from the torsional vibration that takes place during the combustion process and the rotary movement of the crankshaft experiences change in abrupt acceleration and deceleration. All these actions lead to a high degree of wear.

Now, before we head to the part that teaches us about the car engine crankshaft excavator, it’s important to know and understand all the necessary components of the same.

Components Inside a Crankshaft

It is no hidden fact that crankshafts need to be engineered from heavy-duty component materials, to be able to withstand the continuous wear and the real-time strain that is provided to it by the rotary movement.

Due to the fact that they need to be tough at their core, crankshafts are often forged. The treatment involves alloyed heat-treated steel or nitrided steel as the ideal raw material, counting for heavy source. Further, to improve their effective functioning, the crankshaft journals are also surface-hardened.

Listed below are the components that comprise a crankshaft:

  • Main journals
  • Crank webs
  • Counterweights
  • Crank pins

To explain, main journals are the main components that run in the main bearings and are used to define the overall axis of rotation that occurs over the shaft. This core part is then connected to crank pins that are further joined by the crank webs with the main journals. These counterweights allow the machinery to add for balancing.

Moreover, it should also be understood that the size of your car engine describes the crankshaft.

Now that you have the entire idea around crankshafts and their parts, let’s see how to care engine crankshaft excavator:

  • To keep a keen eye on the major component of your automobile, it is essential that you check your crankshaft damage of Main Journal and the Crankpin, followed by the channels of lubricants.


In situations where the crankshaft is found to be defective / broken, it should be repaired or replaced almost instantly.

  • Another possible area to keep a regular check on your crankshaft is the main body. You should be checking for damage (if any), wear, or cracks that have appeared on the body of crank gear.


In situations where the crank gear is found to be defective / broken, it should be repaired or replaced almost instantly.

  • Check the front and rear surfaces of your crankshaft, possibilities are that you might be having issues that are related to the oil seal.


In situations where the crankshaft oil seal is found to be defective / broken, it should be repaired or replaced from its collar.

  • To maintain your crankshaft, we advise you to measure and track the measurements of the external diameter of the main journal of your crankshaft.


When your crankshaft reaches indicators of balk repair around its spheres, you should try to reduce its size and attach a proper main bearing for its oversize. However, when the outer diameter is worn out, its time to replace the crankshaft.

  • Under a situation where even if the outer diameter has not reached its expiry through wear but the roundness of the part has reached its limit, the crankshaft needs to be trimmed for undersize.

Some necessary calculations to keep in mind are:

Check and calculate the clearance between:

A. Exterior of the main journal diameter.

B. Exterior diameter of the crankpin.

To measure the Crankshaft Bending or crookedness, consider the following tips:

A. Check your measurements before the installation of connecting rods in your crankshaft.

B. Keep a record of the measurement before the reassembling of the block.

Now that you have covered the different aspects of caring for your crankshaft, we hope that you won’t be facing any issues in regards to the same.


Ever been in a situation where you don’t know where to buy a new crankshaft from?

Relax, we have the answer for you, you can try out the services of Boodmo to get the best help around the same. Further, you can also reach them out to seek help on all the necessary spare replacements.

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Editorial Officer, I'm an avid tech enthusiast at heart. I like to mug up on new and exciting developments on science and tech and have a deep love for PC gaming. Other hobbies include writing blog posts, music and DIY projects.

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