Compression Check

AllData Editors Note - Ford does not provide a cranking pressure specification, only an acceptable range.





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.