Mercury Mariner 4, 5, and 6HP 4-Stroke Factory Service Manual, Page 34Get this manual

Mercury Mariner 4, 5, and 6HP 4-Stroke Factory Service Manual, Page 34

GENERAL INFORMATION
Cylinder Leakage Testing
NOTE: Cylinder leakage testing, along with compression testing, can help the mechanic pinpoint the source of mechanical failure by gauging the amount of leakage in an engine cylinderRefer to the manufactures tester instructions for proper testing procedures
Courtesy of Snap-On-Tools

Cylinder Leakage Tester (Snap-On-Tools MT324)

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