Uncover the Secrets: How to Check Crankshaft End Play with a Feeler Gauge

Crankshaft end play, a crucial parameter in engine operation, refers to the axial movement of the crankshaft within the engine block. Excessive end play can lead to premature bearing failure, vibration, and reduced engine performance. Regular monitoring of crankshaft end play is essential for maintaining engine health and longevity. This guide will provide a step-by-step approach on how to check crankshaft end play using a feeler gauge.

Prerequisites

Before you begin, gather the following tools and materials:

• Feeler gauge
• Dial indicator (optional)
• Screwdriver or pry bar
• Torque wrench
• Repair manual for your specific engine

Safety Precautions

• Ensure the engine is cool and disconnected from the battery.
• Wear appropriate safety gear, including gloves and eye protection.
• Use caution when handling sharp tools.

Step-by-Step Instructions

1. Remove the Accessory Drive Belts:

Disconnect and remove any accessory drive belts that may obstruct access to the crankshaft pulley.

2. Remove the Crankshaft Pulley:

Using a screwdriver or pry bar, carefully remove the crankshaft pulley from the crankshaft.

3. Install the Feeler Gauge:

Insert a feeler gauge between the thrust bearing surface on the crankshaft and the corresponding surface on the engine block.

4. Measure the End Play:

Gently push the crankshaft back and forth to measure the maximum clearance between the feeler gauge and the bearing surfaces. Record the measurement in thousandths of an inch (mils).

5. Check the Specification:

Refer to the repair manual for your specific engine to obtain the recommended crankshaft end play specification.

6. Adjust the End Play (if necessary):

If the measured end play falls outside the specified range, adjustments may be necessary. Consult the repair manual for instructions on adjusting the thrust bearing clearance.

7. Reassemble the Components:

Once the end play is adjusted, reassemble the crankshaft pulley, accessory drive belts, and any other removed components. Tighten all bolts to the specified torque using a torque wrench.

Using a Dial Indicator (Optional)

For more precise measurements, a dial indicator can be used.

• Attach the dial indicator to the engine block with the tip resting on the crankshaft thrust surface.
• Gently push and release the crankshaft to observe the dial indicator reading.
• Record the maximum and minimum readings, and calculate the end play as the difference between the two.

Causes of Excessive Crankshaft End Play

• Worn or damaged thrust bearings
• Incorrectly installed thrust bearings
• Excessive engine vibration
• Improper crankshaft installation

Symptoms of Excessive Crankshaft End Play

• Knocking noises from the engine
• Vibration
• Oil leaks from the rear main seal
• Reduced engine performance

Tips for Accurate Measurement

• Use a high-quality feeler gauge with precise graduations.
• Ensure the feeler gauge is inserted parallel to the bearing surfaces.
• Take multiple measurements to ensure accuracy.
• If the end play is close to the specified limit, consider replacing the thrust bearings.

Conclusion: Ensuring Optimal Crankshaft End Play

Regularly checking crankshaft end play is a vital aspect of engine maintenance. By following the steps outlined in this guide, you can accurately measure end play and ensure that it falls within the specified range. Maintaining optimal end play contributes to engine longevity, smooth operation, and optimal performance.

Questions You May Have

Q: How often should I check crankshaft end play?
A: Check end play as per the recommended maintenance schedule in your owner’s manual.

Q: Can I adjust crankshaft end play without special tools?
A: No, adjusting end play typically requires specialized tools and knowledge.

Q: What are the consequences of ignoring excessive crankshaft end play?
A: Excessive end play can lead to bearing failure, vibration, oil leaks, and reduced engine life.