Mercury Engine >> EXCESSIVE OIL CONSUMPTION
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Mercury Engine >> EXCESSIVE OIL CONSUMPTION
Excessive Oil Consumption On
5.0L EFI Ford Engines
AERA members report excessive oil consumption on Ford 5.0L EFI engines. This condition has been reported on both existing engines as well as engines that have been recently rebuilt.
One very common source of oil consumption has been through the positive crankcase ventilation (PCV) system. As the first step, verifying that the correct parts are used and are in good working order. For most applications, the crankcase vacuum should be one to three inches of mercury (1 - 3 hg).
If the PCV system is working properly, check the rocker cover for a loose or deformed baffle. The baffle is located in the right valve cover, directly under the PCV valve and may allow oil to collect in a puddle. High vacuum will then pull the oil into the system. Secure or reform the baffle to prevent oil from
collecting under the PCV valve.
The AERA Technical Committee
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