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i have 2004 5.0 liter merc have pressure tested lower unit…

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i have 2004 5.0 liter...
i have 2004 5.0 liter merc have pressure tested lower unit held 15# XXXXX 1/2 hr but still uses oil from monitor bottle do not see oil in water or in bilge where is leak?
Submitted: 8 years ago.Category: Boat
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Answered in 3 minutes by:
6/28/2010
Marine Mechanic: Tan, MerCruiser Certified Technician replied 8 years ago
Tan
Tan, MerCruiser Certified Technician
Category: Boat
Satisfied Customers: 11,415
Experience: 40 yrs. experience with complete engine repairs both inboard/outboard and MerCruiser Certified Technician.
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Hi, Did this problem just start, could I get an engine serial number please?
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Customer reply replied 8 years ago
sorry boat at lake home, yes problem started this spring
Marine Mechanic: Tan, MerCruiser Certified Technician replied 8 years ago

Put the pressure tester on the drive and run the engine. The yoke # XXXXX seal # XXXXX could be leaking only when you run the engine. When you put pressure on the drive sitting the seal lips push out sealing not showing a leak. If a seal is bad it might seal sitting but leak when drive is in use. The sealing surface gets rust on it from sitting tearing the seal when you start the engine or have gotten water in the u-joint bellows.Diagram of Mercury Mercruiser Parts ALPHA ONE (GEN.II)    1998 AND UP 0L100040 & Up DRIVESHAFT HOUSING AND DRIVE GEARS Diagram

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