How to Measure the End Play of a Crankshaft

Introduction

This tutorial will guide you through the process of measuring the end play of a crankshaft, an important aspect of engine assembly and maintenance. Proper measurement ensures the crankshaft is within specifications, contributing to optimal engine performance and longevity.

Step 1: Gather Required Tools

Before you start measuring, ensure you have the following tools:

• Dial indicator
• Magnetic base for the dial indicator
• Feeler gauge
• Torque wrench
• Crankshaft end play specifications (consult the engine manual)

Step 2: Prepare the Engine

Prepare the engine for measurement:

• Ensure the engine is clean and free of debris.
• Remove any components blocking access to the crankshaft.
• If necessary, remove the oil pan to gain better access.

Step 3: Set Up the Dial Indicator

Follow these steps to set up your dial indicator:

1. Attach the Magnetic Base: Secure the magnetic base to a stable surface near the crankshaft.
2. Position the Dial Indicator: Adjust the dial indicator so that the probe touches the end of the crankshaft.
3. Zero the Indicator: Rotate the crankshaft until the indicator reads zero. This will be your starting point for measurement.

Step 4: Measure Crankshaft End Play

To measure the end play, perform the following:

1. Push the Crankshaft Forward: Use a straight edge or your hand to push the crankshaft all the way forward.

2. Record Maximum Reading: Observe the dial indicator and note the maximum reading. This indicates the forward movement.

3. Pull the Crankshaft Backward: Gently pull the crankshaft back to its original position.

4. Record Minimum Reading: Note the reading on the dial indicator after pulling back. This indicates the backward movement.

5. Calculate End Play: Subtract the minimum reading from the maximum reading to determine the crankshaft end play.

Step 5: Compare with Specifications

Check the measured end play against the crankshaft specifications:

• Acceptable Range: Consult your engine manual for the acceptable range of end play.
• Evaluate Results: If your measurement falls within the specified range, the crankshaft is good. If it exceeds the limits, adjustments or repairs may be necessary.

Conclusion

Measuring the end play of a crankshaft is a crucial step in ensuring your engine operates smoothly. By following these steps, you can accurately assess the end play and address any issues that may arise. If adjustments are needed, consider consulting a professional mechanic or referring to your engine's service manual for further guidance.