Ryandi Daffa Saputra

Pancasila University

Dede Lia Zariatin

Pancasila University

DOI: https://doi.org/10.19184/rotor.v17i1.43300  

ABSTRACT 

This research addresses damage and cracks in the Yanmar 6N18L – EV engine block through metal stitching, a cold-welding method using pins and locks to prevent thermal and mechanical cracks. The

study aims to assess crack quality post metal stitching via NDT Liquid Penetrant and hardness through NDT Hardness Testing. Economic value is also evaluated. Data is collected through field observation and experimentation, meeting ASTM 159 G3500 standards. Results indicate successful crack repair, meeting NDT Liquid Penetrant standards, and achieving a 230.6 HB average hardness with a 4.82% variance, aligning with ASTM 159 G3500's 207-255 HB range. Economically, metal stitching proves beneficial with an NPW of Rp 412,353,912, making it a preferred solution for engine block crack issues.

Keywords: Metal stitching, engine block, liquid penetrant test, hardness test, ASTM 159.

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