About the 351W Engine
The 351W engine, also known as the Ford Windsor engine, is a V8 engine produced by Ford Motor Company. It belongs to the Windsor engine family and was introduced in 1969 as a larger version of the 302 Windsor engine. The “351” in its name refers to its displacement of 351 cubic inches (5.8 liters). The 351W engine has been used in various Ford vehicles, including trucks, SUVs, and performance cars. Known for its durability and power, the 351W engine has become a popular choice among automotive enthusiasts and is often used for performance upgrades and engine swaps.
351W Head Bolt Torque Sequence
When assembling or reassembling the cylinder heads on a 351W engine, it is crucial to follow the correct head bolt torque sequence. This ensures proper clamping force and prevents any leaks or damage to the engine. The head bolt torque sequence for the 351W engine is as follows:
| Bolt Number | Torque Specification (ft. lbs.) | Torque Specification (Nm) |
|---|---|---|
| 1 | 70-75 | 95-102 |
| 2 | 60-65 | 81-88 |
| 3 | 50-55 | 68-75 |
| 4 | 40-45 | 54-61 |
| 5 | 30-35 | 41-47 |
| 6 | 20-25 | 27-34 |
| 7 | 10-15 | 14-20 |
| 8 | 1-5 | 1-7 |
Step-by-Step Head Bolt Torque Procedure
To properly torque the head bolts on a 351W engine, follow these steps:
1. Start by cleaning the threads of the head bolts and the bolt holes in the engine block using a suitable cleaning agent.
2. Apply a small amount of engine oil or assembly lubricant to the threads of each head bolt.
3. Install the cylinder heads onto the engine block, ensuring proper alignment and gasket placement.
4. Begin torquing the head bolts in the specified sequence, starting with bolt number 1.
5. Use a torque wrench and socket to tighten each head bolt to the specified torque specification in a clockwise direction.
6. Repeat the torque process for each head bolt, following the sequence provided in the table.
7. After reaching the final torque specification for each bolt, make an additional 90-degree turn in the same sequence to achieve the proper angle torque.
8. Double-check that all head bolts are tightened to the correct torque and angle specifications.
9. Once the head bolts are properly torqued, proceed with the remaining steps of the engine assembly or reassembly process.
Following the correct head bolt torque sequence and specifications is essential to ensure a secure and leak-free seal between the cylinder heads and the engine block. It is important to use a reliable torque wrench and follow the manufacturer’s guidelines for torque values. By taking the time to torque the head bolts correctly, you can help ensure the longevity and performance of your 351W engine.