Description
Technical Overview & Product Details
The fuel injection valve operates under extreme pressure and constant thermal vibration. The 133670-54310 stud bolt is responsible for maintaining the “clamping force” required to keep the injector nozzle perfectly seated against the cylinder head. This constant clamping pressure is vital to prevent combustion gas leakage (blow-by) past the injector, which can quickly lead to carbon buildup, nozzle overheating, and permanent damage to the cylinder head injector bore.
Manufactured from high-tensile, heat-treated alloy steel, this stud is designed to withstand the immense tensile stress and thermal expansion cycles inherent in the 6N18 engine’s combustion chamber environment.
- Compatible Engine Type: Yanmar 6N18 (A)L-V series marine propulsion and auxiliary engines.
- Part Number / Designation: 133670-54310.
- Component Type: Injector Mounting Stud Bolt.
- Material: High-tensile, corrosion-resistant alloy steel with precision-rolled threads.
- Application: Secures the fuel injection valve bracket/flange to the cylinder head.
Key Features & Performance
- Precision Thread Geometry: The threads are manufactured to exact tolerances to ensure a secure, vibration-resistant fit in the cylinder head, preventing backing-off due to engine harmonics.
- High Tensile Strength: Engineered to maintain its elastic pre-load under severe thermal expansion and contraction, ensuring the injector remains securely held in place regardless of engine load.
- Corrosion & Heat Resistance: Specially treated surface finish to resist oxidation and seizing in the high-temperature environment of the cylinder head, allowing for easier removal during future maintenance.
- Structural Reliability: Designed to withstand the high-torque requirements necessary to achieve the correct clamping force for a gas-tight injector seal.
Why Source from Heybeli Marine?
Using non-standard or low-strength bolts can lead to injector “lifting,” gas leakage, and even cracked cylinder head injector ports—costly repairs that can be easily avoided with OEM-spec hardware. Heybeli Marine safeguards your operations with:
- Strict OEM Standards: Our 133670-54310 studs match Yanmar’s original material and dimensional specifications, ensuring 100% reliability and fitment.
- Strategic Global Logistics: We maintain a ready-to-ship stock of critical fasteners and mounting hardware, ensuring rapid delivery to major ports and shipyards worldwide to keep your vessel operational.
- Quality Assurance: Every batch undergoes material strength and thread profile verification to ensure performance in demanding maritime conditions.
- Comprehensive Overhaul Support: We provide these studs alongside our nozzle sleeves, gaskets, and sealing washers, ensuring your technical team has every component necessary for a trouble-free fuel system overhaul.
Technical Maintenance Note:
When replacing the 133670-54310 stud, it is vital to thoroughly clean the tapped hole in the cylinder head of all debris, carbon, and old thread-locking compound. We recommend using a high-temperature anti-seize lubricant on the threads to prevent corrosion and ensure accurate torque readings during installation. Always torque the mounting nuts to the manufacturer’s exact specification using a calibrated torque wrench—never overtighten, as this can stretch the stud and lead to failure, or undertighten, which results in an inadequate seal at the injector tip.