Have a need to keep toping off your Drive Oil Reservoir:

The unexplained need to keep topping off your drive oil reservoir bottle, is caused when the oil is overheated to a point were it is expanding and causing more pressure than the drive seals can handle. The factory pressure tests their drives by pumping air into them until they reach 15 lbs. of pressure. If the seals hold the pressure for a certain length of time, then the drive is considered good. The problem arises if the drive oil expands under heat to a point where it causes more than 15 lbs. of pressure. The drive oil is pushed by the seals until the pressure drops under 15 lbs. or until the drive oil is cooled by submersing it in water. This is the point were the drive is calling on the drive oil reservoir bottle to refill the drive. This problem is commonly referred to as “the mysterious drive oil disappearance”. No oil appears in the bilge, anywhere on the drive or transom, or as an oil slick in the water when the boat is docked. After inspecting the bilge and the outside of the drive for the presents of drive oil, the next thing that a Mercruiser Technician will do is to pressure test the drive, only to find that it passes the 15 lb. leak test. Now he is stumped and can do nothing to help you other than say that it’s up to you to keep the reservoir full at all times.

This is what some of our customers said regarding this problem:

Other sign that your drive may be running too hot is paint discoloration, or a cloud of steam that appears every time your boat comes off plane. Unless you have opened through hull exhaust, what you are seeing is not exhaust, its steam that is generated when a hot drive is plunged into cool water. This process of heating and rapid cooling is known as thermal shock and can be detrimental to metal components, especially aluminum, if the range is extreme.

Keep in mind that however hot the casing is, the components inside are running much hotter. Published test results show that some stern drives components operate in excess of 350 degrees F. If you are experiencing any or all of the above conditions, your drive is probably operating over 250 degrees. For the same reasons that automotive engineers established approximately 200 degrees as an optimum operating temperature for their engines, most marine experts agree that this also holds true for stern drives. Even MerCruiser will admit that 300 degrees is flirting with disaster. That's the temperature at which the oil begins to foam and break down. It loses the ability to lubricate the components inside the drive, causing them to freeze and destroy the inside of the drive. It is commonly referred to as “the drive grenading”.

About Us: Simrek Corporation specializes in external stern drive cooling systems for your high performance or pleasure boating needs. Composed of high-grade  stainless steel, the Simrek Multiport Drive Shower® can add years of life to your Alpha and Bravo drives

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E-mail:simreknc@driveshowers.com   Phone: 352-729-3093 
The new: “No Drill Brackets” and the new “Max Pick-up Port System” are both Protected by US Patent #7,666,042 B2, Issue Date Feb. 23, 2010. 90 Degree Pick-Up Ports US Patent number 6,241,566 Issue Date June 6, 2001.The words: “Simrek”, “Multiport Driveshower” and “Halo” are all Registered Trademarks of Simrek Corp. and may not be used anywhere in print without written permission from Simrek Corp.