MERCURY 2-STROKE 2 CYCLE OUTBOARD OIL
The following outboard 2-Stroke oil procedures apply to the following two stroke outboard models:
1990 1991 1992 1993 1994 1995 1996 1997 1998 1999 2000 2.5hp, 3hp, 3.3hp, 4hp, 5hp, 6hp, 8hp, 9.9hp, 10hp, 15hp, 20hp, 25hp, 30hp, 40hp, 50hp, 60hp, 75hp, 90hp, 100hp, 115hp, 125hp, 135hp, 150hp, 175hp, 200hp, 225hp, 250hp, 275hp.
2-STROKE OIL RECOMMENDATIONS
Use only Quicksilver Premium Plus TC-W3 two-cycle oil or NMMA (National Marine Manufacturers Association) certified 2-stroke lubricants. These oils are proprietary lubricants designed to ensure optimal engine performance and to minimize combustion chamber deposits, avoid detonation and prolong spark plug life. If certified lubricant is unavailable, use only 2-stroke type outboard oil. Never use automotive motor oil.
*Remember, it is this oil, mixed with the gasoline, that lubricates the internal parts of the engine. Lack of lubrication due to the wrong mix or improper type of oil can cause catastrophic powerhead failure.
There are two methods of adding 2-stroke oil to an outboard. The first is the pre-mix method used on most low horsepower and on some commercial outboards. The second is the automatic oil injection method which automatically injects the correct quantity of oil into the engine based on throttle position and operating conditions.
Mixing the engine lubricant with gasoline before pouring it into the tank is by far the simplest method of lubrication for 2-stroke outboards. However, this method is the most messy and causes the most amount of harm to our environment.
The most important part of filling re-mix system is to determine the proper fuel/oil ratio. Most manufacturers use a 50:l ratio (that is 50 parts of fuel to 1 part of oil) or a 100:l ratio. Consult your owners manual to determine what the appropriate ratio should be for your engine.
The procedure itself is uncomplicated. Simply add the correct amount of lubricant to your fuel tank and then fill the tank with gasoline. The order in which you do this s important because as the gasoline is poured into the fuel tank it will mix with and agitate the oil for a complete blending.
If you are attempting to top off your tank, here is a general guideline to determine how much oil to add. For three gallons of fuel you would add 4 ounces of oil to obtain a 100:l ratio; 8 ounces of oil to obtain a 50:1 ratio and 16 ounces of oil to obtain a 25:l ratio.
Most outboard manufacturers use a mechanically driven oil pump mounted on the engine block that is connected to the throttle by way of a linkage arm. The system is powered by the crankshaft, which drives a gear in the pump, creating oil pressure. As the the throttle lever is advanced to increase engine speed, the linkage arm also moves, opening a valve that allows more oil to flow into the oil pump.
Most mechanical-injection systems incorporate low-oil warning alarms that are also connected to an engine-overheating sensor. Also, these systems may have a built-in speed limiter. This sub-system is designed to reduce engine speed automati- cally when oil problems occur. This important feature goes a long way toward preventing severe engine damage in the event of an oil injection problem.
The procedure for filling these systems is simple. On each powerhead there is an auxiliary oil reservoir which holds the 2-stroke oil. Simply fill the oil take to the proper capacity.
*It is highly advisable to carry several spare bottles of 2-stroke oil with you onboard.
NOTE: Always refer to your factory repair manual for additional service procedures.