2. Remove the belt from the idler pulley and slowly relieve the tension on the breaker bar.
Freshwater cooling shown, raw water cooling similar
a - Belt tensioner
3. Inspect the belt for damage and replace as necessary.
4. Route the belt according to the diagram on the decal.
5. Carefully release the tensioner and ensure that the belt stays positioned properly.
6. Check the belt tension.
NOTE: Proper tension is a measurement of deflection with moderate thumb pressure on the belt at the location that has
the longest distance between two pulleys.
Description
Deflection 13 mm (½ in.)
Fuel System
Water‑Separating Fuel Filter
The water‑separating fuel filter is a low‑pressure filter that removes debris and water before the fuel reaches the high‑pressure
fuel pump. It is best to service the water‑separating fuel filter when the engine is cold or after the engine has not run for several
hours. Although the engine may not have run for hours, high ambient air temperatures can cause the fuel system to become
pressurized. The amount of pressure within the system is dependent on the type of fuel system installed on the vessel.
Refer to the Scheduled Maintenance for the proper maintenance interval.
Filter Housing Removal
1. Verify the ignition key switch is off and remove the ignition key.
2. Disconnect the batteries.
3. Locate the water‑separating fuel filter on the starboard front side of the engine.
4. Remove the red service cap.
5. Place a rag or towel around the fuel filter housing to prevent the fuel from leaking or spraying.
6. Use the fuel filter removal/installation tool or the shaft of a screwdriver between the lugs on the filter cover and turn the fuel
filter cover counterclockwise to loosen it. Do not remove the cover.
Maintenance
90-8M0099748 eng DECEMBER 2015 © 2016 Mercury Marine Page 1C-17
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