41370 Mercury PROPELLER SHAFT

Primary Fuel Filter
Every 50 service hours remove and clean the filter element.To remove the filter element (2), stop the engine and shut off the diesel fuel tank valve. Loosen the nut (1) on the filter cover and lower the filter case (3). Remove the element and wash in clean kerosene or diesel fuel. Reinstall the element.
PRIMARY FUEL FILTER
1-Nut. 2-Filter element. 3-Filter case.Final Fuel Filter
Draining Fuel Filter Housing: Every 50 service hours, or even as often as daily during extremely low temperatures, drain the filter housing of sediment and water which settles to the bottom of the compartment. Close the diesel fuel valve at the fuel tank, remove the filter housing drain plug (2) and open the vent valve (1) in the housing. Replace the drain plug and prime the system. See the topic, PRIMING THE FUEL SYSTEM.
DRAINING FUEL FILTER HOUSING
1-Vent valve. 2-Drain plug. Fuel Filter Elements: The fuel filter elements are of the resin impregnated paper type. When the pleated elements have collected enough contamination to interfere with engine performance, they must be replaced with new elements. These elements will continue to collect particles until fuel will no longer flow through them at a rate to maintain maximum engine performance. They will not discharge their burden into the clean fuel, this is prevented by the fine grade filter paper around the perforated metal core.The resin impregnated paper type filter elements collect and hold contaminants and cannot be washed or otherwise restored.As the filters gradually become clogged with foreign material, the position of the fuel gauge indicator will work back from the original position in the NORMAL (green) range, to the CAUTION (white) range and later into the OUT (red) range. When the indicator shows in the OUT (red) range the filter elements should be changed and new Caterpillar elements installed. Removing Used Filter Elements: To remove the used filter elements, proceed as follows:1. Close the diesel fuel line valve.2. Remove the filter housing drain plug.3. Open the vent in the filter housing.4. Thoroughly clean the top of the cover and around the edges of the gasket joint between the filter housing and cover to prevent dirt dropping into the filter housing when it is removed.5. Remove the filter housing from the cover.6. Lift the filter elements out of the housing.The rods and rod springs may be lifted out of the housing to permit the inside of the housing to be thoroughly cleaned if so desired. Installing Filter Elements In Housing: To install the elements in the housing proceed as follows:1. If the rods and rod springs have been removed from the housing, replace the springs and then the rods (2) in the housing. Make certain the rod ends enter the drilled holes in the bottom of the housing and that the springs are piloted on the bosses of the housing and rods.2. Place the filter elements (3) over the rods.3. Place a new gasket on the filter housing.
INSTALLING FUEL FILTER ELEMENTS
1-Cover. 2-Rods. 3-Filter elements.4. Install the housing onto the cover (1), making certain that the rods enter the center of the overlapping drilled holes in the cover.5. Prime the system as outlined in the topic, PRIMING THE FUEL SYSTEM. Keep New Filter Elements On Hand: An extra set of filter elements should be kept on hand for replacement. Always keep the elements wrapped in their original cartons to insure against dust and dirt accumulation which will shorten the life of the elements if it gets on the outside, or may cause damage to the fuel injection equipment if it gets on the inside.