How to Balance a Crankshaft

Balancing a crankshaft is the process of equalizing its weight so it can rotate smoothly and efficiently. This involves adding or subtracting material from certain areas of the crankshaft.

  • Step 1: Secure the Engine: To begin balancing a crankshaft, the engine must first be secured in place on an engine stand or workbench. The crankshaft should be clearly visible and accessible for the process.
  • Step 2: Remove Counterweights: Next, any counterweight bolts that are holding weights onto the crankshaft will need to be removed. Place these parts in a safe container where they can easily be reinstalled at a later time
  • Step 3: Measure Crank throw Weight Balance : Thirdly, measure out each crank throw’s weight balance using calipers or another measuring tool. This helps determine if there is an imbalance between one side of the crank and the other side which could cause vibrations during operation.
  • Step 4: Add Weights to Resolve Imbalances : If there are imbalances within individual throws identified through measurements taken in step three, then add small pieces of metal such as lead or tungsten to resolve them accordingly until both sides match up perfectly according to measurements taken with calipers again across each throw separately.
  • Step 5: Reattach Counterweights : After all balances have been achieved between individual throws, reattach any counterweight bolts removed earlier and secure them tightly into place before continuing further.
How to Balance a Crankshaft


How Do You Balance an Unbalanced Crankshaft?

Balancing a crankshaft is an important part of engine maintenance, as it helps ensure that the parts are all running in sync and not causing undue wear or strain on any single component. The process involves measuring the weight of each crank arm and adjusting them until they are equal. To do this, you will need to use a special tool called a “balancer” which looks like two large scales connected together with a handle for easy maneuvering.

Depending on your engine type, you may also have to replace worn out bearings or rods when balancing the crankshaft. Once everything is measured accurately, you can start by removing one crank arm at a time and adding weights to either side until both sides match up perfectly – if they don’t match then there’s an unbalanced condition that needs attention! Finally, after ensuring each crank arm is balanced correctly, reassemble the crankshaft and make sure it runs smoothly before starting your engine again.

How Much Does It Cost to Balance a Crankshaft?

The cost of balancing a crankshaft depends on the type and size of the crankshaft, as well as the complexity of the job. Generally speaking, it can range anywhere from $50 to $500 or more.

The actual process involves several steps including measuring for balance, machining for weight corrections and then retesting for accuracy.

For example, if you have a four cylinder engine with one main bearing crank counterweight then this type of balancing may only cost around $75-100 dollars depending on your location. However, larger V8 engines with multiple counterweights will require much more work and attention so prices can go up from there.

Additionally, some shops may charge extra fees for additional services like cleaning and magnafluxing parts prior to balancing which could add onto your overall bill too.

What Will Happen If Crankshaft is Not Balanced?

If a crankshaft is not balanced, it can put extra stress on the engine. This can cause wear and tear on the bearings, pistons, rods and other components of your engine. The increased vibration can also lead to premature wear of seals and gaskets as well as potential damage to pulleys or belts that are connected to the crankshaft.

Furthermore, an unbalanced crankshaft will reduce overall performance due to decreased horsepower or torque output because of increased friction caused by imbalance in rotational forces.

Long-term use of an unbalanced crankshaft could result in catastrophic failure including broken connecting rods or even cracked blocks which would require complete replacement of the entire engine assembly if left unchecked for too long.

Crankshaft Balancing: What You Need To Know

How to Balance a Crankshaft at Home

If you want to learn how to balance a crankshaft at home, the first step is to get yourself some basic tools such as a micrometer, dial indicator, and digital scale. Next, you need to identify the areas of imbalance by measuring the rotating mass of each connecting rod journal and then comparing them against one another.

Once this has been done, use weights or balancing compounds in order to correct any imbalances that are found.

Finally, test run your newly balanced crankshaft before re-installing it in your engine. With patience and practice you can successfully balance a crankshaft at home!

How to Balance an Engine at Home

Balancing an engine at home can be a daunting task due to the complexity of the mechanics involved. However, with the right tools and knowledge, it is possible to balance an engine in your own garage. To do so, you will need a degree wheel, crankshaft balancer kit, torque wrench set, dial indicator and several other specialty tools.

You’ll also need to understand how the parts interact and be able to interpret readings from each tool accurately. If done correctly though, balancing your engine at home can save you time and money in diagnostic fees or repair bills!


Overall, balancing a crankshaft is not a difficult task if you have the right tools and knowledge. The key things to remember are to use the correct weighting material, correctly identify any heavy spots on the crankshaft, and properly balance it using sophisticated machinery or by carefully adding weights. With these tips in mind, you should be able to easily balance your own crankshaft with relative ease.

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