Section 5 - Maintenance
Page 64
90-8M0099741
eng
JUNE 2015
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Fraying
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Glazed surfaces
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Proper tension
Use moderate thumb pressure on the belt at the location with the longest distance between two pulleys.
Description
Deflection
13 mm (1/2 in.)
NOTE: Minor, transverse cracks (across the belt width) may be acceptable. Longitudinal cracks (in the direction of belt length)
that join transverse cracks are not acceptable.
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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.
!
CAUTION
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.
Standard cooling shown, closed 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.
a
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