This is the lower bore finished bushing made for use on Cummins 855 and N14
Made IN USA
The LS-8130 Lower Bore Finished Bushing is a precision-machined repair sleeve designed to restore the lower cylinder liner press-fit bore in Cummins 855 and N14 Lower Press-Fit (LPF) engine blocks. Unlike semi-finished repair bushings, the LS-8130 is supplied finish-machined to the final inside diameter, eliminating the need for additional boring or honing after installation and reducing machine shop time during engine rebuilding.
Cummins LPF engines rely on the lower bore to maintain the proper interference fit between the engine block and cylinder liner. This critical fit stabilizes the liner under combustion loads and helps maintain correct liner protrusion at the deck surface. When the lower bore becomes worn from cavitation, fretting, corrosion, or repeated rebuilds, the liner can lose its support, leading to movement within the block and eventual sealing problems.
The LS-8130 restores the lower bore to OEM dimensions, allowing the cylinder liner to seat securely and maintain proper alignment throughout engine operation. By replacing only the damaged lower bore rather than the entire engine block, rebuilders can significantly reduce overhaul costs while restoring long-term reliability.
Common failures associated with a worn lower bore include:
-
Loss of cylinder liner interference fit
-
Liner movement during engine operation
-
Counterbore fretting
-
Coolant leakage around the liner
-
Improper liner protrusion
-
Premature head gasket failure
Because the LS-8130 is finish-sized, it provides a faster repair process than rough repair bushings while still delivering the precision required for professional heavy-duty diesel engine rebuilding.
Key Features & Benefits
-
Finished lower bore repair bushing for Cummins LPF engines
-
Restores worn or damaged cylinder liner press-fit bores
-
Finish-machined ID minimizes additional machine work
-
Re-establishes proper liner interference fit
-
Maintains correct cylinder liner alignment and stability
-
Helps restore proper liner protrusion
-
Salvages expensive Cummins engine blocks
-
Precision-machined for professional engine rebuilding
Verified Engine Coverage
Designed for Cummins Lower Press-Fit (LPF) engines, including:
-
Cummins 855
-
Cummins NH
-
Cummins NT
-
Cummins NTC
-
Cummins N14
-
Additional Cummins 5.5-inch bore LPF engine applications
Typical Applications
-
Lower bore restoration
-
Cylinder liner bore repair
-
Engine block salvage
-
Counterbore repair procedures
-
Complete engine overhaul
-
Heavy-duty diesel machine shop rebuilding
Why It Matters
The lower bore is the foundation that supports the cylinder liner. If it loses its interference fit, the liner can shift under combustion pressure, causing problems that cannot be corrected by machining the upper counterbore alone.
The LS-8130 restores the finished lower bore to the proper dimension, providing the support needed to maintain liner stability, correct protrusion, and dependable head gasket sealing. Because the inside diameter is already finish-machined, it also reduces machining time and improves repair efficiency.
The LS-8130 Lower Bore Finished Bushing is a precision-machined repair sleeve designed to restore the lower cylinder liner press-fit bore in Cummins 855 and N14 Lower Press-Fit (LPF) engine blocks. Unlike semi-finished repair bushings, the LS-8130 is supplied finish-machined to the final inside diameter, eliminating the need for additional boring or honing after installation and reducing machine shop time during engine rebuilding.
Cummins LPF engines rely on the lower bore to maintain the proper interference fit between the engine block and cylinder liner. This critical fit stabilizes the liner under combustion loads and helps maintain correct liner protrusion at the deck surface. When the lower bore becomes worn from cavitation, fretting, corrosion, or repeated rebuilds, the liner can lose its support, leading to movement within the block and eventual sealing problems.
The LS-8130 restores the lower bore to OEM dimensions, allowing the cylinder liner to seat securely and maintain proper alignment throughout engine operation. By replacing only the damaged lower bore rather than the entire engine block, rebuilders can significantly reduce overhaul costs while restoring long-term reliability.
Common failures associated with a worn lower bore include:
- Loss of cylinder liner interference fit
- Liner movement during engine operation
- Counterbore fretting
- Coolant leakage around the liner
- Improper liner protrusion
- Premature head gasket failure
Because the LS-8130 is finish-sized, it provides a faster repair process than rough repair bushings while still delivering the precision required for professional heavy-duty diesel engine rebuilding.
Key Features & Benefits
- Finished lower bore repair bushing for Cummins LPF engines
- Restores worn or damaged cylinder liner press-fit bores
- Finish-machined ID minimizes additional machine work
- Re-establishes proper liner interference fit
- Maintains correct cylinder liner alignment and stability
- Helps restore proper liner protrusion
- Salvages expensive Cummins engine blocks
- Precision-machined for professional engine rebuilding
Verified Engine Coverage
Designed for Cummins Lower Press-Fit (LPF) engines, including:
- Cummins 855
- Cummins NH
- Cummins NT
- Cummins NTC
- Cummins N14
- Additional Cummins 5.5-inch bore LPF engine applications
Typical Applications
- Lower bore restoration
- Cylinder liner bore repair
- Engine block salvage
- Counterbore repair procedures
- Complete engine overhaul
- Heavy-duty diesel machine shop rebuilding
Why It Matters
The lower bore is the foundation that supports the cylinder liner. If it loses its interference fit, the liner can shift under combustion pressure, causing problems that cannot be corrected by machining the upper counterbore alone.
The LS-8130 restores the finished lower bore to the proper dimension, providing the support needed to maintain liner stability, correct protrusion, and dependable head gasket sealing. Because the inside diameter is already finish-machined, it also reduces machining time and improves repair efficiency.