Chapter 9 Finishes, Equipment, and Appliances MJM 40z Owner’s Guide page 38
system. Cracked or collapsed hose? Hose
clamps tight?
Know your fuel additives
When crude oil is
refined as diesel fuel, it acquires additives to
reduce smoke, prevent pre-ignition (“knocking”),
improve its cetane rating, etc. Few additives further
enhance fuel. Some diesel mechanics actually
recommend biocides, such as Killem and Biobor;
lubricants, such as Lubricity and Stanadyne
Performance Formula; and fuel stabilizers, such as
Sta-Bil and Pri-D. But, 1) Follow the instructions on
the container. 2) Routinely, a little bit is better than
a lot and 3) Be guided by your mechanic’s advice.
Monitor for exhaust leaks
From time to time,
when the engine is operating, inspect the
complete exhaust system from the engine to the
through-hull and overboard discharge. Look for
leaks, both exhaust (air) and water. Major leaks will
be obvious, but early signs of leaks due to hairline
cracks in hoses and water pot muffler systems
may not be. Diesel exhaust contains acidic sulfur
and other gasses that may poison the air within the
boat. To detect air leaks, look for telltale traces of
black soot. Water leaks should also be immediately
repaired. Leaks never resolve spontaneously; they
must be addressed as quickly as possible.
Properly dispose of hazardous waste
Be sure to
properly dispose of used coolant, used engine oil
and transmission fluid, contaminated fuel, old filters
soaked with fuel and oil, etc. These fluids are
generally poisonous to people, pets, wildlife and
the environment, and some of them can be
recycled.
9.3
S
TARTING WITH
L
OW
B
ATTERIES
Each engine has a dedicated
ENGINE BATTERY.
They
may be connected with the
ENGINE
EMERGENCY PARALLEL
(EEP) switch. (Normally the
EEP switch should be off.) Each
ENGINE
ALTERNATOR
provides 12V DC current to charge
its battery.
The
ENGINE BATTERIES
are also connected
by the
AUTOMATIC CHARGER RELAY
(ACR) switch to the
HOUSE BATTERIES
. When an
ENGINE BATTERY
reaches 13.2V the ACR switch closes and the
ENGINE BATTERY
shares charging current with both
HOUSE BATTERIES
and the other
ENGINE BATTERY,
connected by its ACR switch. This 4-battery bank,
charged by both alternators has a total reservoir of
595-amp hrs. (See wiring diagrams, page 46, and
the adjacent concept diagram.) The
GENERATOR
BATTERY
is separate and dedicated to the
generator only.
Normally when underway, both the
ENGINE
ALTERNATORS
and the
GENERATOR
(if running)
provide charging current to both
ENGINE
BATTERIES
and both
HOUSE BATTERIES. However,
if
a battery falls below 12.3V, the
ACR
switch opens
to separate it from the rest of the bank. That
prevents a low or shorted battery from draining the
entire battery bank. For instance:
•
If the
PORT
ENGINE BATTERY
drops below
12.3V, the port ACR switch opens and
disconnects the port
ENGINE BATTERY
from
both
HOUSE BATTERIES
and the STARBOARD
ENGINE BATTERY
.
•
If the
HOUSE BATTERIES
drop below 12.3V,
both
ACR
switches would open to protect the
ENGINE BATTERIES
.
Concept diagram of
HOUSE
and ENGINE
BATTERY connections with
ACR
and
EEP
switches
Starting engines with one low engine battery
If you’re not connected to shore power and if the
PORT ENGINE BATTERY
is depleted
and the PORT
ENGINE
doesn’t start, start the
STARBOARD ENGINE
to boost the STARBOARD ENGINE BATTERY. (
Since
the
PORT ENGINE BATTERY
is depleted, the ACR
switch has disconnected the PORT ENGINE
BATTERY from the house batteries to prevent
draining them.)
Summary of Contents for 40z
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