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Thumbnail Filmstrip of 5.9 Cummins Ring and Band Style Intake Valve Stem Seal SBI 122-1269 Images
The SBI Intake Valve Stem Seal 122-1269 is a precision-engineered solution for maintaining the mechanical integrity and clean combustion of your Dodge 5.9L or 3.9L 4BT diesel engine. In a high-torque diesel environment, the intake valve seal performs a delicate balancing act: it must block excessive oil from entering the combustion chamber while simultaneously allowing a microscopic film to pass through. By replacing your worn factory seals with this high-quality SBI unit, you prevent the carbon buildup and "blue smoke" associated with oil bypass, ensuring your intake tract remains clean and your engine operates at peak volumetric efficiency.
- Positive Style Sealing: Unlike "umbrella" seals that move with the valve, this positive-style seal remains fixed to the valve guide, providing consistent and reliable oil control across the entire RPM range.
- Precision Oil Metering: Specifically designed to meter a tiny, controlled amount of oil to the valve stem and guide bore, ensuring the components stay lubricated without compromising combustion.
- Robust Ring & Band Design: Features a secure ring and band retention system that keeps the seal firmly in place, even under the high-vibration conditions typical of a 4BT or 5.9L Cummins.
- Oversize Stem Support: Engineered with the flexibility to accommodate up to 0.015" oversize valve stems, making it an excellent choice for cylinder heads that have been refreshed or machined.
- Sold Individually: Allows for complete customization of your build, whether you are replacing a single damaged seal or sourcing a full set for a comprehensive 8-valve or 12-valve head restoration.
Investing in the 122-1269 is a smart, educational choice for any engine builder who understands that oil control is fundamental to diesel longevity. Modern engines demand strict adherence to design requirements, and this SBI seal is manufactured to meet those exact industry standards. By ensuring that the valve stem and guide bore receive just the right amount of lubrication, you are actively preventing premature guide wear and potential valve seizure. Whether you are maintaining a high-mileage 12-valve workhorse or finishing a custom 4BT swap, these seals provide the professional-grade protection necessary to keep your valvetrain running smoothly for years to come.
Specifications:
- Type: Positive
- Seal O.D: 0.6900
- Style: Ring and Band
- Top Stem I.D: 0.2900
- Overall Height: 0.4860
- Bottom Seal I.D: 0.4620
- Inner Seal Height: 0.3375
- Material: Fluoroelastomer
- Nominal Stem Diameter: 8mm
- Nominal Guide O.D: 0.475-0.531
Note:
- Qty of 6 intake valve stem seals required for 5.9L 6BT.
- Qty of 4 intake valve stem seals required for 3.9L 4BT.
The SBI Intake Valve Stem Seal 122-1269 is a precision-engineered solution for maintaining the mechanical integrity and clean combustion of your Dodge 5.9L or 3.9L 4BT diesel engine. In a high-torque diesel environment, the intake valve seal performs a delicate balancing act: it must block excessive oil from entering the combustion chamber while simultaneously allowing a microscopic film to pass through. By replacing your worn factory seals with this high-quality SBI unit, you prevent the carbon buildup and "blue smoke" associated with oil bypass, ensuring your intake tract remains clean and your engine operates at peak volumetric efficiency.
Positive Style Sealing: Unlike "umbrella" seals that move with the valve, this positive-style seal remains fixed to the valve guide, providing consistent and reliable oil control across the entire RPM range.
Precision Oil Metering: Specifically designed to meter a tiny, controlled amount of oil to the valve stem and guide bore, ensuring the components stay lubricated without compromising combustion.
Robust Ring & Band Design: Features a secure ring and band retention system that keeps the seal firmly in place, even under the high-[...]
The SBI Intake Valve Stem Seal 122-1269 is a precision-engineered solution for maintaining the mechanical integrity and clean combustion of your Dodge 5.9L or 3.9L 4BT diesel engine. In a high-torque diesel environment, the intake valve seal performs a delicate balancing act: it must block excessive oil from entering the combustion chamber while simultaneously allowing a microscopic film to pass through. By replacing your worn factory seals with this high-quality SBI unit, you prevent the carbon buildup and "blue smoke" associated with oil bypass, ensuring your intake tract remains clean and your engine operates at peak volumetric efficiency.
- Positive Style Sealing: Unlike "umbrella" seals that move with the valve, this positive-style seal remains fixed to the valve guide, providing consistent and reliable oil control across the entire RPM range.
- Precision Oil Metering: Specifically designed to meter a tiny, controlled amount of oil to the valve stem and guide bore, ensuring the components stay lubricated without compromising combustion.
- Robust Ring & Band Design: Features a secure ring and band retention system that keeps the seal firmly in place, even under the high-vibration conditions typical of a 4BT or 5.9L Cummins.
- Oversize Stem Support: Engineered with the flexibility to accommodate up to 0.015" oversize valve stems, making it an excellent choice for cylinder heads that have been refreshed or machined.
- Sold Individually: Allows for complete customization of your build, whether you are replacing a single damaged seal or sourcing a full set for a comprehensive 8-valve or 12-valve head restoration.
Investing in the 122-1269 is a smart, educational choice for any engine builder who understands that oil control is fundamental to diesel longevity. Modern engines demand strict adherence to design requirements, and this SBI seal is manufactured to meet those exact industry standards. By ensuring that the valve stem and guide bore receive just the right amount of lubrication, you are actively preventing premature guide wear and potential valve seizure. Whether you are maintaining a high-mileage 12-valve workhorse or finishing a custom 4BT swap, these seals provide the professional-grade protection necessary to keep your valvetrain running smoothly for years to come.
Specifications:
- Type: Positive
- Seal O.D: 0.6900
- Style: Ring and Band
- Top Stem I.D: 0.2900
- Overall Height: 0.4860
- Bottom Seal I.D: 0.4620
- Inner Seal Height: 0.3375
- Material: Fluoroelastomer
- Nominal Stem Diameter: 8mm
- Nominal Guide O.D: 0.475-0.531
Note:
- Qty of 6 intake valve stem seals required for 5.9L 6BT.
- Qty of 4 intake valve stem seals required for 3.9L 4BT.