Section 5 - Maintenance
90-8M0057081
eng
MARCH 2011
Page 111
b. Rotate the automatic tensioner clockwise.
a -
Serpentine belt
b -
Automatic tensioner
c -
Idler pulley
d -
Alternator
e -
Idler pulley
f -
Sea water pump pulley
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 Cummins MerCruiser 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 Cummins MerCruiser Authorized Repair Facility.
4. Should the serpentine belt need replacement consult your Cummins MerCruiser 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.
!
WARNING
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.
!
WARNING
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
.
Engine Control Module (ECM) and Vessel Integration Panel (VIP).
The ECM and VIP require a stable voltage source. During
multiple engine operation, an onboard electrical device may cause a sudden drain of voltage at the engine's battery. The voltage
may drop below the ECM or VIP minimum voltage requirements. The alternator on the second engine may also start charging,
causing a voltage spike in the engine's electrical system.
In either case, the ECM could shut off. When the voltage returns to the range that the ECM requires, the ECM will reset itself. The
engine will now run normally. This ECM shut down usually happens so fast that the engine just appears to have an ignition miss.
Intermittent or temporary VIP shutdown can cause a loss of instrumentation, engine misfire and can adversely effect power
package performance and boat safety.
Batteries.
Boats with multi‑engine electronic control power packages require each engine be connected to its own battery,
ensuring that the engine's ECM has a stable voltage source.
a
b
25415
f
e
d
c
