VESSEL DESIGN
3-2
ZT350 Installation Manual
Vessel Design Considerations
© 2007 Yanmar Marine International
Before reviewing the Vessel Design Consideration
section, review
.
VESSEL DESIGN
CONSIDERATIONS
ALWAYS adhere to all applicable marine
regulations such as the United States Coast
Guard (USCG), European Union-Recreational
Craft Directive (EU-RCD), and so on and the
standards they reference such as the American
Boat and Yacht Council (ABYC), Society of
Automotive Engineers (SAE), International
Standards Organization (ISO), and so on, when
designing and constructing the boat and the
boat components, such as the engine
compartment, fuel delivery system and exhaust
system.
When choosing a vessel that will potentially be
modified for the installation of the ZT350
stern-drive, ensure that the vessel transom meets
the following criteria:
• Transom thickness should be between 51 and 57
mm (2 - 2.25 in.).
• The inner and outer surface of the transom
should be parallel to within 3 mm (0.125 in.).
• The inner surface of the transom is flat to within 3
mm (0.125 in.).
• The outer surface of the transom is flat to within 2
mm (0.075 in.).
• The transom angle is between 10 and 16° (13° is
ideal).
• Ensure that there is enough flat surface area on
the transom to apply the transom plate. This
would be 203 mm (8 in.) on either side of the
center line of the transom.
Figure 3-1
Figure 3-1
1 – Transom Thickness
2 – Transom Angle
3 – Transom plate coverage 203 mm (8.0 in.)
from the center.
4 – Inner Surface
5 – Outer Surface
Transom Thickness
See Checking the Transom Thickness on page 4-7.
Laying Out the Transom Cutout
See Positioning the Drive Unit on page 4-3.
Vessel Engine Mount Position
The engine mount position should allow for a
minimum of 6 mm (0.25 in.) of vertical adjustment
on the front mounts of the engine.
Note: The mounting hardware that is
incorporated with the engine usually
allows for some adjustment. However, it
is good practice to ensure that the
engine mount points that hold the engine
in the vessel are all in parallel planes.
• Tie a string from the front right mount position
and the left rear mount position.
• Tie a string from the left front mount position
and the right rear mount position.
• The strings should touch at the point of
intersection.
(1)
(2)
(4)
(
3
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3
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(5)
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