As a senior car enthusiast, it's crucial to ensure that your engine is in top-notch condition. One of the essential checks you need to perform is checking the piston to valve clearance. This check ensures that the piston and valve do not come into contact with each other, which can result in catastrophic engine failure. In this article, we will guide you through the process of checking piston to valve clearance.
What is Piston to Valve Clearance?
Piston to valve clearance is the distance between the piston and the valve when the piston is at top dead center (TDC). This clearance is essential to ensure that the piston and valve do not come into contact with each other during the engine's operation. If the clearance is too small or non-existent, the piston and valve will collide, causing severe engine damage.
Tools Needed to Check Piston to Valve Clearance
To check piston to valve clearance, you will need the following tools:
- Feeler gauges
- Top dead center (TDC) tool
- Wrenches
- Screwdriver
- Plastigage
Step-by-Step Guide to Check Piston to Valve Clearance
Follow these steps to check piston to valve clearance:
Step 1: Remove Valve Cover
Remove the valve cover to access the valves.
Step 2: Rotate Engine
Rotate the engine in the direction of normal rotation until the piston is at top dead center (TDC).
Step 3: Install TDC Tool
Install the TDC tool to ensure that the piston is at TDC.
Step 4: Check Valve Clearance
Use a feeler gauge to check the valve clearance. Insert the feeler gauge between the valve stem and the rocker arm. The feeler gauge should have a slight drag when inserted. If the feeler gauge slides in too easily, the valve clearance is too large. If the feeler gauge does not fit, the valve clearance is too small.
Step 5: Remove Spark Plug
Remove the spark plug to access the piston.
Step 6: Install Plastigage
Place a small piece of plastigage across the piston's center, perpendicular to the wrist pin. Reinstall the spark plug.
Step 7: Rotate Engine
Rotate the engine in the direction of normal rotation until the piston is at bottom dead center (BDC).
Step 8: Check Plastigage
Remove the spark plug and plastigage. Use the provided chart to determine the clearance between the piston and valve. If the clearance is too small, you will need to adjust the valve lash. If the clearance is too large, you may need to install a thicker head gasket.
Conclusion
Checking piston to valve clearance is an essential task that every car enthusiast should perform. By following these steps, you can ensure that your engine is running at its best and avoid costly engine damage. Remember to always consult your vehicle's service manual for specific instructions and clearance specifications.