Serpentine Drive Belt; Checking; Replacing Or Adjusting - MerCruiser Axius 350 MAG User Manual

Section 5 - Maintenance

Serpentine Drive Belt

Checking

Inspecting the belts with the engine running may cause serious injury or death. Turn off
the engine and remove the ignition key before adjusting tension or inspecting belts.
1. Inspect the serpentine drive belt for the following:
•
•
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 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.
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b
a
h
g
a - Alternator pulley
b - Water circulating pump pulley
c - Tensioner pulley and adjustment
stud
d - Serpentine belt
Excessive wear
Cracks
Fraying
Glazed surfaces
Proper tension ‑ See Replacing or Adjusting for proper specifications.
WARNING
!
c
d
e
f
33283
e - Steering pump pulley
f - Crankshaft pulley
g - Seawater pump pulley
h - Idler pulley
mc75130-1
90-899883234 JANUARY 2008