About the Briggs and Stratton Engine
The Briggs and Stratton engine is a popular choice for many small engines, including lawnmowers, generators, and other power equipment. Known for their reliability and durability, Briggs and Stratton engines are designed to provide consistent performance and power. One crucial component of these engines is the cylinder head, which plays a vital role in the combustion process. Ensuring the proper torque of the cylinder head bolts is essential for maintaining the engine’s performance and preventing any potential issues.
Head Bolt Torque Specifications
To properly torque the cylinder head bolts on a 21 hp Briggs and Stratton engine, it is important to follow the manufacturer’s specifications. The table below provides the recommended torque values in both foot-pounds (ft. lbs.) and Newton meters (Nm) for the cylinder head bolts:
| Bolt Size | Torque (ft. lbs.) | Torque (Nm) |
|---|---|---|
| 1/4″ | 7-9 | 9.5-12.2 |
| 5/16″ | 12-13 | 16.3-17.6 |
| 3/8″ | 18-20 | 24.4-27.1 |
Steps to Torque the Cylinder Head Bolts
To ensure the proper torque of the cylinder head bolts on your 21 hp Briggs and Stratton engine, follow these steps:
1. Start by cleaning the cylinder head and the threads of the bolts to remove any dirt, debris, or old gasket material.
2. Place the cylinder head gasket onto the engine block, aligning it properly with the bolt holes.
3. Carefully position the cylinder head onto the gasket, ensuring it sits flush against the engine block.
4. Begin tightening the cylinder head bolts in a crisscross pattern, starting with the center bolts and working your way outward.
5. Use a torque wrench to tighten each bolt to the specified torque value according to the table above.
6. Repeat the tightening process for each bolt, ensuring they are all torqued to the recommended specifications.
7. Double-check the torque of each bolt to ensure they are all properly tightened.
8. Once all the bolts are torqued, recheck the torque after a short period of engine operation to account for any settling or compression of the gasket.
Following these steps and using the correct torque values will help ensure the cylinder head bolts are properly tightened, providing a secure seal and optimal performance for your Briggs and Stratton engine.
Remember, it is crucial to refer to the specific engine model’s manual or consult with a qualified technician for the most accurate and up-to-date torque specifications for your particular Briggs and Stratton engine.