Serpentine Drive Belt; Checking; Replacing - Mercury MerCruiser Owner's Manual

Serpentine Drive Belt

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.

Checking

1. Inspect the drive belt for proper tension and 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

IMPORTANT: If a belt is to be reused, it should be installed in the same direction of rotation
as before.
90-899883295 JUNE 2008
a
i
h
Belt Routing Diagram
a - Idler pulley
b - Water circulating pump pulley
c - Alternator pulley
d - Idler pulley
e - Power steering pump pulley
Excessive wear
Cracks
Fraying
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.
WARNING
!
b
g
f - Idler pulley
g - Crankshaft pulley
h - Seawater pump pulley
i - Tensioner pulley
mc75130-1
Section 5 - Maintenance
c
d
e
f
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