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Glazed surfaces
2.
Check the operation of the automatic tensioner and associated components.
a.
Position a suitable tool on the automatic tensioner pulley bolt.
b.
Rotate the automatic tensioner clockwise.
c.
Release the automatic tensioner allowing it to return to a load position on the serpentine belt.
d.
The automatic tensioner must return to the initial position and hold tension on the serpentine belt. If the automatic
tensioner does not operate smoothly or does not return to a loaded position providing tension on the belt, it must be
replaced. See your Mercury Diesel authorized dealer for all of your repair needs.
3.
There is no adjustment available for the serpentine belt. If the belt becomes loose or noisy, it has worn out and must be
replaced. See your Mercury Diesel authorized repair facility.
4.
Should the serpentine belt need replacement consult your Mercury Diesel authorized repair facility.
Battery
Refer to the specific instructions and warnings accompanying your battery. If this information is not available, observe the
following precautions when handling a battery.
Recharging a weak battery in the boat, or using jumper cables and a booster battery to start the engine, can cause serious
injury or product damage from fire or explosion. Remove the battery from the boat and recharge in a ventilated area away
from sparks or flames.
An operating or charging battery produces gas that can ignite and explode, spraying out sulfuric acid, which can cause
severe burns. Ventilate the area around the battery and wear protective equipment when handling or servicing batteries.
Battery Precautions for Multiple Engines
Alternators: Alternators are designed to charge a single battery that supplies electrical power to the individual engine on which
the alternator is mounted. Connect only one battery to one alternator. Do not connect two batteries to the same alternator
unless a battery isolator is used.
90-8M0089579
MARCH 2014
eng
d
c
f
b
a
25415
WARNING
!
WARNING
!
21062
a -
Serpentine belt
b -
Automatic tensioner
c -
Idler pulley
d -
Alternator
e -
Idler pulley
e
f -
Seawater pump pulley
Section 5 - Maintenance
Page 71
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