Upper Repair Insert Finished for use on the DD15. The dimensions are 6.756" x 6.587" x 0.502".
The LS-6756F Upper Repair Insert (Finished) is a precision-machined, ready-to-install repair bushing designed specifically for Detroit Diesel DD15 engine blocks. This finished insert is used to restore worn, damaged, or out-of-spec upper liner bore / top deck areas, returning the block to proper geometry without the need for additional machining after installation.
Counterbore block wear in DD15 engines can result from liner mis alignment, corrosion, improper liner protrusion, or repeated rebuild cycles. If left uncorrected, these conditions can lead to head gasket failures, coolant intrusion, liner movement, and reduced engine life. The LS-6756F provides a permanent, professional repair by re-establishing the correct liner support surface and bore alignment to OEM standards.
Because this insert is supplied finished, it significantly reduces labor time compared to semi-finished or rough inserts—making it ideal for high-volume rebuild shops, remanufacturers, and fleet maintenance facilities focused on efficiency and repeatable quality.
Key Features & Benefits
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Designed specifically for Detroit Diesel DD15 upper liner bore repair.
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Restores proper liner seating, alignment, and support at the top deck area.
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Helps prevent head gasket leaks, liner drop, and combustion sealing failures.
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Precision-machined for accurate fit and OEM-level geometry restoration.
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Heavy-duty construction suitable for high-compression diesel applications.
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Cost-effective alternative to block replacement during DD15 engine rebuilds.
Applications
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Detroit Diesel DD15 engines
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Upper liner bore / top deck repair
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Engine rebuilds, remanufacturing, and block reconditioning
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Fleet maintenance and professional diesel machine shops
