Mercury MerCruiser Axius 350 MAG, User Manual, Page: 112 / 151

Section 5 - Maintenance
Page 104 90-864197084 NOVEMBER 2008
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.
mc75130-1
• Fraying
• Glazed surfaces
• Proper tension ‑ See
Replacing or Adjusting
for proper specifications.
Replacing or Adjusting
IMPORTANT: If a belt is to be reused, it should be installed in the same direction of rotation as before.
1. Loosen the 16 mm (5/8 in.) locking nut on the adjustment stud.
2. Turn the adjustment stud and loosen the belt, if a new serpentine drive belt is required. Remove the old belt and install a new
belt onto the pulleys.
NOTE: Belt tension is measured on the belt at the location that has the longest distance between two pulleys.
3. Attach the Kent Moore belt tension gauge, or equivalent, to the belt.
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 the adjusting stud to adjust the belt tension.
6. Check the gauge for correct belt tension. The gauge has different ranges for new and used belts.
Kent Moore belt tension gauge shown, all similar
a - Kent Moore belt tension gauge
b - Serpentine belt
.
Serpentine belt tension using a tension gauge
Used belt
356–378 N (80–85 lbf)
New belt 467–489 N (105–110 lbf)
7. While holding the adjustment stud at the correct belt tension, tighten the 16 mm (5/8 in.) locking nut.
a - 16 mm (5/8 in.) locking nut
b - 8 mm (5/16 in.) adjusting stud
8. Operate the engine for a short period of time and recheck the belt adjustment.
32544
a
COLOR GUIDE
for
PATENT
2.83918
NEWTONE
NEWT
ONE
b
a
b
32545