The LS-8799 Bolt Hole Thread Inserts are precision-machined repair sleeves engineered for restoring damaged or worn cylinder head bolt holes on Cummins ISX / ISX15 engine blocks. Designed as heavy-duty, permanent repair components, these inserts provide a renewed, hardened thread surface that meets or exceeds OEM clamping standards—ensuring secure head bolt torque, proper cylinder head sealing, and long-term engine reliability.
Cylinder head bolt holes on Cummins ISX engines can become stripped, distorted, or fatigued due to repeated rebuilds, over-torquing, corrosion, or block wear. The LS-8799 inserts are manufactured to re-establish correct thread engagement depth and alignment, preventing head gasket failure, coolant intrusion, liner movement, and loss of clamping force under combustion load.
These inserts are to be used with a dedicated boring/repair fixture such as the M20111-A / M20111-C Cummins ISX Headbolt Hole Repair System, restoring the block to service-ready condition while avoiding the cost of block replacement. Built from premium alloy steel, LS-8799 inserts deliver superior thread integrity for ISX rebuilders, remanufacturers, and fleet maintenance facilities.
Key Features & Benefits
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Engineered specifically for Cummins ISX / ISX15 block head bolt hole repair.
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Restores damaged or stripped bolt holes to OEM-level thread strength and alignment.
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Ensures proper head bolt torque retention, preventing head gasket leakage and combustion sealing failures.
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Precision-machined to maintain correct thread pitch, depth, and perpendicularity.
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Heavy-duty alloy construction for long-term durability in high-compression diesel engines.
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Must be installed using Cummins ISX headbolt repair fixtures for accurate machining and installation.
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Cost-effective alternative to engine block replacement—ideal for high-mileage fleet engines and remanufacturing operations.
Applications
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Cummins ISX / ISX15 cylinder head bolt hole repair
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Block reconditioning during major overhauls or rebuilds
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Fleet and vocational truck maintenance
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Engine remanufacturing and machine shop operations
