The ATC-8707 / PT-8707 Detroit Diesel 60 Series Bolt Hole Thread Insert is a precision repair component designed to restore the integrity of compromised headbolt holes in Detroit 60 Series (DD13, DD15, DD16) engine blocks. The insert features an internal thread of M16 × 2.00 and an external thread dimension of 13⁄16″-16 TPI, with an overall length of 2.50″.
When headbolt holes become stripped, worn, or out of specification, installing the LS-8707 ensures proper bolt engagement and alignment—restoring structural strength and sealing reliability without costly re-machining or block replacement. This insert is ideal for engine rebuilders, diesel shops, and remanufacturers working on Detroit 60 engines.
Key Features & Benefits
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Internal thread: M16 × 2.00; external thread: 13⁄16"-16 TPI
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Length of 2.50″ gives deep engagement for secure bolt seating
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Restores bolt hole integrity in DD Series 60 engine blocks
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Compatible with M20111-DD repair fixtures and standard block thread repair kits (Kent-Moore / Porta Tool / Detroit)
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Helps prevent head gasket leaks and bolt misalignment
Suggested Use & Installation Notes
Use the LS-8707 insert after installing a proper alignment fixture (such as the M20111-DD) to maintain precise axis alignment while reaming, tapping, or installing the insert. After insert installation, confirm thread cleanliness and torque-bore alignment before head installation.