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Section 4 - Maintenance
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.
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
Flushing the Power Package—Models with a Flushing Attachment
NOTE: Flushing is needed only for salty, brackish, mineral‑laden, or polluted water applications. Flushing is recommended after
each outing for best results.
Page 46
CAUTION
!
Standard cooling shown, closed cooling similar
a -
Belt tensioner
54989
21062
13 mm (½ in.)
90-8M0119292
MAY 2016
eng
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