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Section 4 - Maintenance
Replacing
IMPORTANT: If the belt is removed and is found to be in acceptable condition to use, you must install it in the same direction of
rotation as before.
NOTE: All power packages have a decal on the front of the engine. The decal shows the serpentine belt routing. Refer to the
decal when installing the serpentine belt.
The belt tensioner operates within the limits of movement provided by the cast stops when the belt length and geometry are
correct. If the tensioner contacts either of the cast stops during operation, check the mounting brackets and the belt length.
Loose brackets, bracket failure, accessory drive component movement, incorrect belt length, or belt failure can cause the
tensioner to contact the cast stops. See your authorized MerCruiser dealer for service if these conditions exist.
Rapid release of the belt tensioner, or allowing the tensioner to snap back quickly, could cause injury or product damage.
Relieve the spring tension slowly.
1.
Use a breaker bar and appropriate socket to relieve the tensioner. Rotate the tensioner counterclockwise away from the
belt until it stops.
2.
Remove the belt from the idler pulley and slowly relieve the tension on the breaker bar.
a
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
Corrosion Protection
Corrosion Information
Whenever two or more dissimilar metals are submerged in a conductive solution, such as saltwater, polluted water or water
with a high mineral content, a chemical reaction takes place causing electrical current to flow between metals. The electrical
current flow causes the metal that is most chemically active, or anodic, to erode. This is known as galvanic corrosion. For more
information contact your authorized Mercury MerCruiser dealer.
Maintaining Ground Circuit Continuity
The transom assembly and sterndrive are equipped with a ground wire circuit to ensure good electrical continuity between the
engine, transom assembly, and sterndrive components. Good continuity is essential for the MerCathode System to function
effectively.
Page 72
CAUTION
!
Standard cooling shown, closed cooling similar
a -
Belt tensioner
54989
13 mm (½ in.)
90-8M0128973
eng
MAY 2017
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Troubleshooting
