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Mercury MERCRUISER - Serpentine Drive Belt; Checking; Replacing

Mercury MERCRUISER
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Section 5 - Maintenance
90-899883295 JUNE 2008 Page 101
Serpentine Drive Belt
!
WARNING
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.
b
c
d
e
f
g
h
i
a
33539
Belt Routing Diagram
a - Idler pulley
b - Water circulating pump pulley
c - Alternator pulley
d - Idler pulley
e - Power steering pump pulley
f - Idler pulley
g - Crankshaft pulley
h - Seawater pump pulley
i - Tensioner pulley
Checking
1. Inspect the drive belt for proper tension and for the following:
• Excessive wear
• Cracks
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.
• 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.
mc75130-1
Replacing
IMPORTANT: If a belt is to be reused, it should be installed in the same direction of rotation
as before.

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