The M20111-B Headbolt Hole Repair Fixture is a precision alignment and drilling fixture designed to restore damaged or misaligned cylinder head bolt holes in Caterpillar 3400 / 3406 and Cummins K-series engine blocks. This tool ensures that the head bolts align perfectly after repair operations—keeping head gasket sealing integrity intact and preventing bore damage.
Used in conjunction with head bolt thread inserts, the M20111-B holds the repair tooling rigid and concentric to the original bolt hole, allowing safe reaming then tapping. With this fixture, engine rebuilders can confidently restore head bolt holes affected by corrosion, thread damage, or misdrilling.
Key Features & Benefits
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Precision fixture for Caterpillar 3406 / 3408 / 3400 and Cummins K-series headbolt repair
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Holds repair tooling concentric to the original bolt axis to avoid misalignment
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Compatible with insertion of thread repair inserts
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Supports reaming, tapping, and damaged bolt hole repairs
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Durable construction built to withstand shop use
Typical Applications
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Repairing stripped, cross-threaded, or damaged head bolt holes during engine rebuilds
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Reinstalling head bolts after head gasket replacement
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Supporting engine shops, heavy-duty rebuilders, and specialty diesel repair facilities
