Description. This PPE Harmonic Balancer Bolt is a top - notch choice for high - performance diesel engines. It fits 2001 - 2019 GMC Sierra 2500HD/3500HD with a 6.6L Duramax engine. Engineered to exceed expectations, it offers unmatched strength, precision, and durability. Heat - treated and thread - rolled to meet MIL - S - 8879 specs, it reduces thread stress for long - lasting performance. As the engine speeds up, the crankshaft faces various pressures and vibrations. This bolt firmly attaches the harmonic balancer to the crankshaft, minimizing vibrations and ensuring smooth engine operation. Part Number: 118034250. Features: Suitable for high - performance and stock applications, tensile strength over 200,000 psi, made from chromoly Alloy Steel, 12 - point head style, and a black oxide finish for corrosion protection. For installation details, click here.

Using this harmonic balancer bolt is straightforward. First, make sure your vehicle is a 2001 - 2019 GMC Sierra 2500HD/3500HD with a 6.6L Duramax engine. Then, securely attach the bolt to connect the harmonic balancer to the crankshaft. When installing, follow the correct torque specifications. As for maintenance, since it has a black oxide finish, it has some protection against corrosion. But it's still a good idea to regularly check for any signs of wear or damage. If you notice any issues, replace the bolt promptly to keep your engine running smoothly. And remember, this bolt is suitable for both high - performance and stock applications, so it can meet different needs.