mercury Workshop Repair Guides

Mercury Workshop Service and Repair Manuals

Valve Clearance > < Spark Plug|Specifications|Page 2707
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Compression Check: Specifications

NOTE:  Compression pressure should be checked at normal operating temperature with spark plugs removed and throttle plate wide open. Cylinder
compression pressure is considered within specification if lowest reading cylinder is within 75 percent of highest reading.

Valve Clearance > < Spark Plug|Specifications|Page 2707