Sundays_Child
Well-Known Member
Never having had outdrives, I don't know how helpful this idea is. Anyway, I came across it and thought it may be of interest to some:
Most boat engines (both outboard and stern drive) have an outboard leg or gearbox. The oil in this leg is supposed to be changed after every hundred hours of use. On smaller, trailered boats this is a relatively simple task, because the boat is regularly taken out of the water allowing easy access to the gear box.
However, on larger boats, such as houseboats and launches, which are difficult to take out of the water, the task of changing the oil becomes much more difficult. The gearbox must be in a vertical position when the oil is changed, meaning that the drain holes are underwater. Normally this makes it impossible to change the oil without removing the boat from the water, or by getting a mechanic to remove the whole gearbox.
The Marine Oil Replacement System consists of a plunger, a foot pump and three lengths of hose with threaded seals at one end of each hose. These seals are designed to provide a watertight connection to both the drain hole and the vent hole in the gear box (or outboard leg). Different threads are available to suit different types of motor.
To remove the old oil from the gear box:
• The gear box is tilted out of the water.
• The non-threaded end of the first hose is connected to the foot pump.
• The threaded end is connected to the vent hole.
• The other hose is connected to the drain hole and the bottom of the plunger.
• The engine is tilted back into the water.
• Using the foot pump, compressed air is pushed through the hose. The force of the low pressure compressed air forces the oil out of the gear box and into the sealed plunger. For extra pressure there is the option of pulling up on the plunger to use suction to assist in drawing out the oil. The used oil is then safely be disposed of without any leaks into the water.
Once the used oil has been emptied from the plunger, it is filled with the required amount of new oil and basically repeat the process in reverse.
Source/Contact:
http://www.abc.net.au/tv/newinventors/txt/s1718341.htm
Most boat engines (both outboard and stern drive) have an outboard leg or gearbox. The oil in this leg is supposed to be changed after every hundred hours of use. On smaller, trailered boats this is a relatively simple task, because the boat is regularly taken out of the water allowing easy access to the gear box.
However, on larger boats, such as houseboats and launches, which are difficult to take out of the water, the task of changing the oil becomes much more difficult. The gearbox must be in a vertical position when the oil is changed, meaning that the drain holes are underwater. Normally this makes it impossible to change the oil without removing the boat from the water, or by getting a mechanic to remove the whole gearbox.
The Marine Oil Replacement System consists of a plunger, a foot pump and three lengths of hose with threaded seals at one end of each hose. These seals are designed to provide a watertight connection to both the drain hole and the vent hole in the gear box (or outboard leg). Different threads are available to suit different types of motor.
To remove the old oil from the gear box:
• The gear box is tilted out of the water.
• The non-threaded end of the first hose is connected to the foot pump.
• The threaded end is connected to the vent hole.
• The other hose is connected to the drain hole and the bottom of the plunger.
• The engine is tilted back into the water.
• Using the foot pump, compressed air is pushed through the hose. The force of the low pressure compressed air forces the oil out of the gear box and into the sealed plunger. For extra pressure there is the option of pulling up on the plunger to use suction to assist in drawing out the oil. The used oil is then safely be disposed of without any leaks into the water.
Once the used oil has been emptied from the plunger, it is filled with the required amount of new oil and basically repeat the process in reverse.
Source/Contact:
http://www.abc.net.au/tv/newinventors/txt/s1718341.htm
