Valve adjustment Briggs and Stratton 18.5 hp

Valve adjustment is an important maintenance procedure for any engine, including the Briggs and Stratton 18.5 horsepower engine. Proper valve clearance ensures that the engine runs smoothly and efficiently, and that the valves do not burn or stick. In this blog post, we will walk you through the steps to adjust the valves on your Briggs and Stratton 18.5 horsepower engine.

Valve adjustment Briggs and Stratton 18.5 hp

Step 1: Preparation Before you start the valve adjustment, make sure the engine is cool and the spark plug is disconnected. Remove the valve cover and set it aside.

Step 2: Locate the valves Locate the intake and exhaust valves on your engine. They should be located on the top of the cylinder head and will be marked with “I” for intake and “E” for exhaust.

Step 3: Check valve clearance Using a feeler gauge, check the valve clearance between the rocker arm and the valve stem. The intake valve clearance should be between 0.003 and 0.005 inches, and the exhaust valve clearance should be between 0.005 and 0.007 inches. If the clearance is outside of these ranges, you will need to adjust the valves.

Step 4: Adjust the valves To adjust the valves, first loosen the lock nut on the rocker arm with a wrench. Use a flathead screwdriver to turn the adjustment screw until the correct valve clearance is achieved. Then, hold the adjustment screw in place with the screwdriver and tighten the lock nut with the wrench.

Step 5: Recheck valve clearance After adjusting the valves, recheck the valve clearance with a feeler gauge. If the clearance is still not within the recommended range, repeat steps 4 and 5 until the correct clearance is achieved.

Step 6: Reassemble Once you have completed the valve adjustment, replace the valve cover and connect the spark plug.

How do you adjust the valves on a 18 HP Briggs and Stratton?

Here are the general steps to adjust the valves on an 18 HP Briggs and Stratton engine:

  1. Remove the valve cover: First, locate the valve cover on top of the engine and remove it using a socket wrench or a screwdriver. Set the valve cover aside in a safe place.
  2. Locate the valves: Locate the intake and exhaust valves on the engine. The exhaust valve will be on the left side of the engine, and the intake valve will be on the right side.
  3. Rotate the engine: Use a wrench to rotate the engine until the piston is at top dead center (TDC) on the compression stroke. You can verify that the piston is at TDC by checking that both valves are closed and the timing mark on the flywheel is aligned with the pointer.
  4. Adjust the valves: Using a feeler gauge, measure the clearance between the valve stem and rocker arm. Adjust the clearance by loosening the lock nut with a wrench and turning the adjuster screw with a screwdriver. Once the clearance is set, hold the adjuster screw in place and tighten the lock nut.
  5. Repeat the process: Repeat the same process for the other valve, making sure to rotate the engine to the correct position for that valve.
  6. Reinstall the valve cover: Once both valves have been adjusted, reinstall the valve cover and tighten the bolts or screws.

It’s important to consult your engine’s manual for the specific valve clearance and torque specifications for your model of engine, as these may vary depending on the specific engine type and application. Additionally, it’s recommended to perform valve adjustments at least once a year or after every 100 hours of operation to maintain engine performance and prevent damage.

How do you adjust the valves on a 17.5 Briggs and Stratton?

Here are the general steps to adjust the valves on a 17.5 HP Briggs and Stratton engine:

  1. Remove the valve cover: Locate the valve cover on top of the engine and remove it using a socket wrench or a screwdriver. Set the valve cover aside in a safe place.
  2. Locate the valves: Find the intake and exhaust valves on the engine. The exhaust valve will be on the left side of the engine, and the intake valve will be on the right side.
  3. Rotate the engine: Use a wrench to rotate the engine until the piston is at top dead center (TDC) on the compression stroke. You can verify that the piston is at TDC by checking that both valves are closed and the timing mark on the flywheel is aligned with the pointer.
  4. Adjust the valves: Using a feeler gauge, measure the clearance between the valve stem and rocker arm. The clearance should be 0.005 – 0.007 inches for both intake and exhaust valves. Adjust the clearance by loosening the lock nut with a wrench and turning the adjuster screw with a screwdriver. Once the clearance is set, hold the adjuster screw in place and tighten the lock nut.
  5. Repeat the process: Repeat the same process for the other valve, making sure to rotate the engine to the correct position for that valve.
  6. Reinstall the valve cover: Once both valves have been adjusted, reinstall the valve cover and tighten the bolts or screws.

It’s important to consult your engine’s manual for the specific valve clearance and torque specifications for your model of engine, as these may vary depending on the specific engine type and application. Additionally, it’s recommended to perform valve adjustments at least once a year or after every 100 hours of operation to maintain engine performance and prevent damage.

Does a valve adjustment increase horsepower?

A valve adjustment can potentially increase horsepower and improve engine performance if the valves were previously out of adjustment and causing issues such as poor compression or improper timing. When the valves are properly adjusted, they can help maximize airflow and fuel combustion efficiency, leading to increased horsepower and better overall performance. However, it’s important to note that valve adjustments alone are not likely to result in significant horsepower gains unless the engine was experiencing problems due to incorrect valve clearance. In general, a valve adjustment is part of regular engine maintenance to ensure proper performance and prevent damage rather than a performance upgrade.

What is the valve clearance on a Briggs & Stratton?

The valve clearance on a Briggs & Stratton engine varies depending on the model and type of engine. However, as a general rule of thumb, the intake valve clearance should be between 0.003 and 0.006 inches, and the exhaust valve clearance should be between 0.005 and 0.008 inches. It’s important to consult your engine’s manual to find the specific valve clearance specifications for your model of engine, as the clearance may vary depending on the specific engine type and application.

Conclusion

Valve adjustment is an important maintenance procedure for any engine, and the Briggs and Stratton 18.5 horsepower engine is no exception. Following these steps will ensure that your engine runs smoothly and efficiently for years to come.

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