Marine Metal Stitching Guide
The definitive guide to cold casting repairs for cracked engine blocks and cylinder heads.
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Cold Repair Technology
Metal stitching is a world-renowned mechanical cold repair process used to restore cracked or broken castings. Unlike welding, metal stitching introduces no heat stress, preserving the original metallurgical structure of the casting.
Advantages Over Welding
- Zero Heat Distortion: No structural warping or metallurgical changes to the parent metal.
- Class Approved: Permanently accepted by BV, Lloyd's, and DNV for major repairs.
- Pressure Tight: Capable of sealing jacket water and high-pressure oil leaks.
How Metal Stitching Works
The process involves several key components designed to pull the crack together and restore the casting's structural integrity:
- Stitching Studs: Interlocking threaded studs that create a gas-tight seal across the crack line.
- Masterlocks: High-tensile steel keys inserted across the crack to restore the casting's original tensile strength.
- Precision Drilling: Our technicians use specialized jigs to ensure exact alignment and load distribution.
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