Replacing Belt And/Or Adjusting Tension - Mercury Inboard 5.7L Manual

Maintenance
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Replacing Belt and/or Adjusting Tension

IMPORTANT: If a belt is to be reused, it should be installed in the same direction of rotation
as before.
NOTE: Belt deflection is to be measured on the belt at the location that has the longest
distance between two pulleys.
1. Loosen the 16 mm (5/8 in.) locking nut on the adjustment stud.
2. Turn the adjustment stud and loosen the belt.
3. If a new serpentine drive belt is required, remove the old belt and install a new belt onto
the pulleys.
4. Put a wrench on the adjustment stud 16 mm (5/8 in.) locking nut.
5. Use a 8 mm (5/16 in.) socket and tighten adjusting the stud to adjust the belt deflection.
6. Using one of the 2 methods following, check for correct deflection.
a.
b.
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Glazed surfaces
Proper tension ‑ 13 mm (1/2 in.) deflection, with moderate thumb pressure, on the
belt at the location that has the longest distance between two pulleys.
Push down with moderate thumb pressure on the longest stretch of belt. Proper
deflection is 13 mm (1/2 in.).
Attach the Kent Moore© Belt Tension Gauge to the belt. The gauge has different
ranges for new and used belts.
b
a - Kent Moore© Tension Gauge
mc75130-1
a
b -
14980
Serpentine belt
90-860174050 JUNE 2005