Valve Adjustment Briggs And Stratton Valve Clearance Chart
Introduction
Briggs and Stratton is a popular brand when it comes to small engines used in lawnmowers, generators, and other outdoor equipment. One important maintenance task for these engines is valve adjustment, which involves setting the clearance between the valve stem and the rocker arm. In this article, we will discuss the valve adjustment process for Briggs and Stratton engines, and provide a valve clearance chart for reference.
Why Valve Adjustment is Important
Valve clearance affects engine performance and longevity. If the clearance is too small, the valve may not fully close, causing loss of power and potential engine damage. On the other hand, if the clearance is too large, the valve may not fully open, leading to reduced power and increased exhaust emissions. Proper valve clearance ensures efficient engine operation and prevents premature wear and tear.
Valve Adjustment Process
The valve adjustment process involves removing the valve cover, rotating the engine to the correct position, and using a feeler gauge to measure the clearance between the valve stem and rocker arm. The following steps provide a general overview of the process:
- Remove the spark plug wire and spark plug to prevent accidental engine start-up
- Remove the valve cover
- Rotate the engine to the correct position using the flywheel or camshaft
- Measure the valve clearance using a feeler gauge
- Adjust the clearance as necessary using a wrench and screwdriver
- Reinstall the valve cover and spark plug
Valve Clearance Chart
The valve clearance for Briggs and Stratton engines varies depending on the model and type of engine. The following chart provides general guidelines for valve clearance:
| Engine Type | Intake Valve Clearance | Exhaust Valve Clearance |
|---|---|---|
| Single Cylinder OHV | 0.004-0.006 in. (0.10-0.15 mm) | 0.004-0.006 in. (0.10-0.15 mm) |
| Twin Cylinder OHV | 0.003-0.005 in. (0.08-0.13 mm) | 0.003-0.005 in. (0.08-0.13 mm) |
| Single Cylinder L-Head | 0.005-0.007 in. (0.13-0.18 mm) | 0.005-0.007 in. (0.13-0.18 mm) |
| Twin Cylinder L-Head | 0.005-0.007 in. (0.13-0.18 mm) | 0.005-0.007 in. (0.13-0.18 mm) |
Tips and Tricks
Here are some tips and tricks to make valve adjustment easier:
- Use a magnetic tool to remove and reinstall the valve cover screws
- Rotate the engine in the correct direction to prevent damage to the starter and flywheel
- Adjust valve clearance when the engine is cold to ensure accurate measurements
- Use a torque wrench to tighten the valve cover screws to the proper specification
Conclusion
Valve adjustment is an important maintenance task for Briggs and Stratton engines, and proper clearance ensures efficient engine operation and prevents premature wear and tear. The valve adjustment process involves removing the valve cover, rotating the engine to the correct position, and using a feeler gauge to measure the clearance between the valve stem and rocker arm. Refer to the valve clearance chart for the appropriate clearance for your engine. Follow these tips and tricks to make valve adjustment easier and more efficient.
