General arrangement and planning
37
Engine centre distance,
twin installation
For twin installations, consideration must be given to
the minimum distance between the engines to allow
sufficient accessibility for service work. Larger dis-
tance also gives better manoeuvring capacities.
Check for a suitable distance by using the dimen-
sional drawing.
Generally, the following minimum measurements
between the engine’s centre-lines (
A) are recom-
mended:
D5/D7
050 mm (4")
D9/D
200 mm (47")
D2
250 mm (49")
D6
350 mm (53")
For installation of several engines on one propeller
shaft the distance between the engines is mainly
determined by the gears or belt transmissions with
which the engines are joined together. The require-
ment for access for inspection, service and repairs is
still applicable.
A
Weight distribution
General
The centre of gravity has a major influence on the
boat’s static and dynamic stability. It is therefore im-
portant to consider this for the both when loaded and
unloaded.
Planing and semi-planing hulls
For planing and semi-planing hulls especially it is im-
portant that heavy equipment such as engines, fuel
tanks, water tanks and batteries are positioned in a
way as to obtain the best possible trim of the boat in
the water.
Consider the weight distribution of the boat so that it
is evenly distributed even with different levels of fuel
and water in the tanks.
It is an advantage to install the fuel tanks away from
the warm engine room. The batteries should be
placed in a separate, well ventilated area if possible.
Figure A represents an installation with good weight
distribution and with a good trim angle.
Figure B represents a wrong type of installation with
a subsequent bad running attitude.
LCG = Longitudinal Centre of Gravity
LCG
LCG
Figure A
Figure B
Summary of Contents for D11 series
Page 1: ...Marine Propulsion Diesel Engines Installation 1 1 D E D5 D16 series ...
Page 2: ......
Page 208: ...206 References to Service Bulletins Group No Date Concerns ...
Page 209: ...207 Notes ...
Page 210: ...208 Notes ...
Page 212: ...7748655 English 11 2007 ...