Overview
- The amount of end play is determined by the design of the engine and the wear on the crankshaft and bearings.
- The amount of end play is equal to the thickness of the feeler gauge that can be inserted between the crankshaft and the thrust bearing.
- Crankshaft end play should be checked whenever the engine is rebuilt or if you are experiencing any of the symptoms of excessive end play.
Crankshaft end play is a critical measurement that affects the performance and longevity of an engine. It is the amount of axial movement that the crankshaft has within the engine block. Excessive end play can cause damage to the crankshaft, bearings, and other engine components. Therefore, it is essential to measure and adjust crankshaft end play to the manufacturer’s specifications.
What is Crankshaft End Play?
Crankshaft end play is the axial movement of the crankshaft within the engine block. It is measured in thousandths of an inch (mils). The amount of end play is determined by the design of the engine and the wear on the crankshaft and bearings.
Why is Crankshaft End Play Important?
Crankshaft end play is important because it affects the following:
- Bearing life: Excessive end play can cause the crankshaft to move back and forth within the bearings, which can lead to premature bearing failure.
- Oil pressure: Excessive end play can also reduce oil pressure, which can damage the engine.
- Engine performance: Excessive end play can cause the engine to run rough and lose power.
How to Measure Crankshaft End Play
There are two methods for measuring crankshaft end play:
Method 1: Using a Dial Indicator
1. Remove the spark plugs.
2. Turn the crankshaft until the piston in the first cylinder is at top dead center (TDC).
3. Attach a dial indicator to the crankshaft and set the dial to zero.
4. Gently push the crankshaft forward and then backward.
5. Record the total movement of the crankshaft on the dial indicator.
Method 2: Using a Feeler Gauge
1. Remove the spark plugs.
2. Turn the crankshaft until the piston in the first cylinder is at TDC.
3. Insert a feeler gauge between the crankshaft and the thrust bearing.
4. Gently push the crankshaft forward and then backward.
5. The amount of end play is equal to the thickness of the feeler gauge that can be inserted between the crankshaft and the thrust bearing.
How to Adjust Crankshaft End Play
If the crankshaft end play is not within the manufacturer’s specifications, it will need to be adjusted. This can be done by replacing the thrust bearings or by adding shims to the thrust bearing assembly.
Symptoms of Excessive Crankshaft End Play
The following are symptoms of excessive crankshaft end play:
- Knocking or rattling noise: This noise is caused by the crankshaft hitting the thrust bearings.
- Low oil pressure: Excessive end play can reduce oil pressure, which can damage the engine.
- Engine performance: Excessive end play can cause the engine to run rough and lose power.
Takeaways
Measuring and adjusting crankshaft end play is an important part of maintaining an engine. By following the steps outlined in this guide, you can ensure that your engine is running properly and will last for many years to come.
Common Questions and Answers
Q: What is the ideal crankshaft end play for my engine?
A: The ideal crankshaft end play for your engine depends on the make and model of your vehicle. You can find the specifications for your engine in the manufacturer’s service manual.
Q: What are the consequences of excessive crankshaft end play?
A: Excessive crankshaft end play can cause damage to the crankshaft, bearings, and other engine components. It can also reduce oil pressure and cause the engine to run rough and lose power.
Q: How often should I check crankshaft end play?
A: Crankshaft end play should be checked whenever the engine is rebuilt or if you are experiencing any of the symptoms of excessive end play.