How To Check Pushrod Length With Hydraulic Lifters

How to Check Pushrod Length with Hydraulic Lifters

Checking pushrod length with hydraulic lifters requires precision and attention to detail. An incorrect pushrod length can lead to serious engine damage, including valve float, bent pushrods, and premature wear on components. This guide will walk you through the process step-by-step.

Tools You'll Need:

• Pushrod Length Checker: This specialized tool accurately measures pushrod length. It's essential for precise measurements.
• Feeler Gauges: Used to check valve lash (clearance) once the correct pushrod length is determined.
• Socket Set: To remove and install rocker arms and other components.
• Torque Wrench: To properly tighten components to the manufacturer's specifications.
• Clean Rags: Keep your workspace clean to avoid damaging engine parts.
• Service Manual: Consult your vehicle's service manual for specific torque specifications and procedures.

Understanding Hydraulic Lifters:

Hydraulic lifters automatically adjust valve lash, eliminating the need for regular manual adjustments. However, the pushrod length must be correct for the lifters to function properly. Incorrect pushrod length prevents the lifter from properly compensating for wear and can lead to issues.

Step-by-Step Guide to Checking Pushrod Length:

1. Preparation: Ensure the engine is cold. Safety first! Disconnect the battery's negative terminal to prevent accidental shorts.

2. Remove Rocker Arms: Carefully remove the rocker arms from the cylinder head. Note their position and orientation for correct reinstallation. Keep the rocker arms organized to prevent confusion.

3. Install Pushrod Length Checker: Carefully install the pushrod length checker into the lifter bore. This tool will provide a precise measurement point. Make sure the tool is seated firmly and correctly.

4. Measure Pushrod Length: Insert the pushrod into the lifter bore. Using the pushrod length checker, carefully measure the length of the pushrod extending beyond the checker. Record this measurement.

5. Compare to Specifications: Consult your vehicle's service manual to find the correct pushrod length for your engine. Compare your measurement to the specifications. A difference, even a slight one, indicates a problem and may require pushrod replacement.

6. Correcting Pushrod Length: If the pushrod is too long or too short, it MUST be replaced with a pushrod of the correct length. Do not attempt to modify an existing pushrod. Using an incorrectly sized pushrod can cause severe engine damage.

7. Reinstallation: Once you've confirmed or corrected the pushrod length, reinstall the rocker arms. Ensure they are correctly oriented and tightened to the specifications found in your service manual. Use a torque wrench to avoid over-tightening.

8. Check Valve Lash: After reassembly, check the valve lash using feeler gauges. This ensures the valves are operating correctly. Again, refer to your service manual for appropriate lash specifications.

9. Final Check: Start the engine and listen for any unusual noises. Any clicking, tapping, or other abnormal sounds may indicate a problem. If issues persist, re-check your work.

Troubleshooting:

• Inconsistent Measurements: If you get inconsistent measurements, double-check your technique and ensure the pushrod length checker is properly seated.
• Damage to Components: Carefully inspect all parts for damage during removal and reinstallation.

This comprehensive guide provides a detailed approach for checking pushrod length with hydraulic lifters. Remember, precision and accuracy are paramount to prevent potential engine damage. Always refer to your vehicle's service manual for specific instructions and torque specifications. If you are not comfortable performing this procedure, consult a qualified mechanic.