The LS-6300 Lower Repair Sleeve is a precision-engineered repair sleeve designed specifically for the Cummins ISX heavy-duty diesel engine family. This lower repair sleeve/bushing is used to restore worn or damaged lower liner bores, recreating correct liner seating geometry for secure liner installation and long-term engine reliability.
Manufactured to exacting tolerances (dimensions 6.300 × 5.875 × 1.300 inches) the LS-6300 provides a precisely machined surface for the cylinder liner to seat against. This is especially valuable when wear, erosion, or previous repairs have compromised the block’s lower bore — conditions that may lead to liner instability, coolant leaks, head gasket failures or liner movement under load.
When used as part of a complete rebuild process — including counterbore inspection, cleanup, and proper liner protrusion measurement — the LS-6300 helps ensure that the engine block is returned to OEM-level alignment standards. It is ideal for rebuild shops, remanufacturers, and heavy-duty fleet maintenance operations that demand durable, professional-grade repair solutions for ISX engines.
Key Features & Benefits
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Engine-specific repair sleeve for Cummins ISX lower liner bores.
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Precise dimensions (6.300 × 5.875 × 1.300 in) for accurate bore restoration and liner seal integrity.
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Restores worn or damaged lower bore surfaces — helps prevent coolant intrusion, liner shifting, head gasket leaks, and premature engine failure.
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Supports correct cylinder liner installation, proper liner protrusion, and long-term sealing performance.
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Durable, professional-grade component suitable for heavy-duty rebuild shops and fleet maintenance facilities.
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Cost-effective alternative to full block replacement — restores block integrity and extends engine life.