How To Grind A Crankshaft At Home ?


A crankshaft is an essential component of an engine that converts reciprocating motion into rotational motion. In simpler terms, it is what makes your car move. Without a properly functioning crankshaft, your engine can’t operate. It’s crucial to keep your crankshaft in good condition to keep your engine running smoothly. While having a professional do the job can be expensive, it’s worth learning how to grind your crankshaft at home.

Section one: Preparation

Tools and materials needed to grind a crankshaft

You will need several specialized tools to grind a crankshaft. These include a Grinder, Dial gauge, Micrometer, Plastigage, V-blocks, and a Straightedge. You will also need safety equipment like safety goggles, earplugs, and a dust mask.

Safety precautions and protective equipment

Grinding a crankshaft can be hazardous, and safety should be a top priority. Use safety goggles to protect your eyes from metal filings and debris. Use earplugs or noise-canceling headphones to protect your ears from loud noises. A dust mask should be worn to prevent inhalation of metal dust.

Having a clean and well-lit workspace

A clean workspace is essential to ensure that your tools and equipment remain in good condition. Any contamination could affect the accuracy of your measurements, so it’s important to keep your workspace clean. Having adequate lighting in your workspace is also important, as it will allow you to see small details more clearly.

Section two: Removing and Inspecting the Crankshaft

How to remove the crankshaft from the engine

The crankshaft can be removed from the engine by following several steps, including removing the flywheel, piston connecting rods, and engine bearings. Once these components are removed, the crankshaft can be lifted out of the engine.

How to inspect the crankshaft for wear or damage before grinding

Before grinding the crankshaft, it’s important to inspect it thoroughly. Use a dial gauge to check for any bends or distortions in the crankshaft. Use a micrometer to measure the diameters of the journals to see if they meet the manufacturer’s recommended specifications. Use Plastigage to measure the clearance between the bearings and the crankshaft.

Section three: Grinding the Crankshaft

Explaining the grinding process and how it works

The grinding process involves removing a small layer of material from the surface of the crankshaft journals to provide a smooth surface for the bearings to run on. The process can be achieved using a grinding wheel that is carefully balanced to provide a precise finish.

Providing a step-by-step guide to grinding your crankshaft

Grinding the crankshaft requires specialized tools and a lot of patience. Once you have the crankshaft removed and have inspected it for wear and damage, follow these steps to grind your crankshaft:

  1. Mount the crankshaft on the V-blocks and secure it in place
  2. Start the grinding wheel and check the alignment of the crankshaft
  3. Begin grinding with a light and steady pressure, making sure to maintain a consistent speed and angle
  4. Use a micrometer to check the diameter of the journal and continue grinding until you get the recommended dimension
  5. Once complete, remove the crankshaft and inspect it again to ensure that the bearings can run smoothly over the ground journals

Discussing the importance of careful, precise grinding to ensure the best results

Grinding the crankshaft requires patience and a lot of attention to detail. Careful and precise grinding is essential to achieve the best results. Grinding too much material can weaken the crankshaft, while grinding too little may not produce the desired smooth finish.

Section four: Testing and Reinstalling the Crankshaft

How to test the crankshaft after grinding

After grinding the crankshaft, it’s important to test it to ensure that it’s working correctly. Use a dial gauge to measure the axial and radial runout across all of the journals to check for any issues.

Explaining how to reinstall the crankshaft back into the engine

Reinstalling the crankshaft is the reverse of the removal process. Once you have completed the inspection and grinding process, you can put the crankshaft back in place in the engine. Ensure that you use new bearings and follow the manufacturer’s recommended torque settings to ensure that the crankshaft is correctly secured in place.

Providing advice on how to maintain the newly ground crankshaft for optimal performance

Once the crankshaft is back in place in the engine, it’s important to maintain it for optimal performance. Change the engine oil frequently, as this helps to lubricate the crankshaft and reduce friction. Regularly check the oil pressure to ensure that the engine is operating correctly.


The crankshaft is a vital component in your engine, and it’s essential to keep it in good condition. While having a professional grind your crankshaft can be expensive, learning to do it at home can save you a lot of money. Remember to take your time, follow safety precautions, and seek help if needed. Grinding your crankshaft requires patience and attention to detail, but the results are worth it.

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People also ask

What is a crankshaft?

A crankshaft is a mechanical component in an engine that converts the reciprocating motion of the piston into rotational motion.

Why would I need to grind a crankshaft?

A crankshaft may need to be ground if it is damaged, worn, or bent. Grinding the crankshaft can restore the original specifications of the component.

Can I grind a crankshaft at home?

Grinding a crankshaft is a job that requires specialized tools and equipment. It is recommended that you seek the services of a professional machinist or engine builder.

What kind of equipment is needed to grind a crankshaft?

A crankshaft grinder is required to grind a crankshaft. This machine uses a grinding wheel to remove material from the surface of the crankshaft.

What are the stages of grinding a crankshaft?

The grinding of a crankshaft is typically done in several stages. The journal surfaces are first ground down to the correct size, then the bearings are polished. Finally, the crankshaft is balanced to ensure that it is stable and doesn’t vibrate excessively during operation.

How much does it cost to grind a crankshaft?

The cost of grinding a crankshaft can vary depending on the size of the engine and the scope of the work. It is recommended that you get a quote from a professional machinist or engine builder before proceeding with the job.

Is there anything else I need to know before grinding a crankshaft?

Grinding a crankshaft is a precision job that requires expertise and attention to detail. Improper grinding can damage the crankshaft or cause it to fail prematurely. It is recommended that you seek the services of a professional machinist or engine builder.

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