mercury Workshop Repair Guides

Mercury Workshop Service and Repair Manuals

Compression Check|System Diagnosis > < Vehicle Lifting|Service and Repair|Page 2952
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Compression Check: Specifications

COMPRESSION READINGS - INTERPRETING 

Examine and compare the readings for all of the cylinders. Pressure variation between the highest and lowest cylinders should be within 75 percent of
one another. See provided chart. The chart shows maximum compression readings and their corresponding 75% minimums. Variations between
cylinders will have a greater effect on engine performance than overall readings that are even but slightly below specifications.

Compression Check|System Diagnosis > < Vehicle Lifting|Service and Repair|Page 2952