Mercury Mariner 4, 5, and 6HP 4-Stroke Factory Service Manual, Page 33Get this manual

Mercury Mariner 4, 5, and 6HP 4-Stroke Factory Service Manual, Page 33

GENERAL INFORMATION
Compression Check
1Remove spark plugs2Install compression gauge in spark plug hole3Hold throttle plate at W.O.T4Crank the engine over until the compression reading peaks on the gaugeRecord the reading5Check and record compression of cylinderA reading below 36 psi might indicate total engine wear problemMaximum (psi) 50 Minimum (psi) 36

Compression listed above is with decompression assembly in operationMaximum (psi) 130 Minimum (psi) 100

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