Serpentine Belt; Inspection - Mercury MerCruiser Diesel Inboard 2.8L Operation & Maintenance Manual

Section 4 - Maintenance
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.
a
e

Serpentine Belt

Inspection

1. Inspect the 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
2. Check the operation of the automatic tensioner and associated components.
a. Position a suitable tool in the automatic tensioner release slot.
b. Rotate the automatic tensioner in the direction of the arrow.
Page 66
WARNING
!
4.2L inboard shown, 2.8L similar
a - Water circulating pump pulley
b
b - Alternator pulley
c - Idler
c
d - Automatic tensioner
e - Crankshaft pulley
f - Seawater pump pulley
d
g -

Serpentine belt

f
g
26602
a - Automatic tensioner
b - Release slot
b
a
23256
21062
90-8M0133679 JUNE 2017
eng