40
INSTALLATION AND PREDELIVERY
OUTBOARD INSTALLATION
Transom Measuring and Drilling
Hull Centerline
Use the chines of the boat as reference points to
locate the centerline of the boat transom.
Use a straightedge to draw a line connecting the
port and starboard chines.
Use a framing square to accurately place a verti-
cal line on the transom. The centerline of the hull
should be in line with the keel, and perpendicular
to the midpoint of the line connecting the chines.
Dual-Outboard Centerlines
The following table lists standard ABYC centerline
spacing between outboards in dual installations:
Some applications may require changes in this
dimension to avoid strakes, to adjust for transom
height, or for performance reasons. Best perfor-
mance can be determined only through testing.
Refer to boat manufacturer for recommendations.
If the standard spacing does not allow full steering
travel in a particular installation, it may be neces-
sary to increase the spacing.
IMPORTANT: Some steering systems may
require additional spacing. Refer to steering sys-
tem manufacturer for recommendations.
The top edge of the transom should be more than
twice the width of the dual-outboard centerline
spacing dimension. Bracket installations may not
require this consideration.
Measure the transom for dual-outboard spacing
after the centerline of the hull is established.
Divide the spacing dimension by two. Use the
resulting number to space the outboard center-
lines from the hull centerline.
EXAMPLE: A 26 in. (660 mm) dual-outboard
spacing would result in two outboard centerlines,
each 13 in. (330 mm) from the hull centerline.
Transom Height
Make sure the transom height matches the length
of the outboard to be installed.
• A 19 to 21 in. (48.3 to 53.3 cm) transom height
uses a 20 in. (50.8 cm) shaft outboard.
• The shaft length of the outboard being installed
should come close to matching the transom
height of the boat.
Determine transom height by measuring from the
top edge of the transom, along the centerline.
1. Chine
2. Strake
3. Keel
4. Hull centerline
DR5568
2 and 3 cylinder 22 in. (559 mm)
V4 and V6 26 in. (660 mm)
1234
1. Port centerline
2. Hull centerline
3. Starboard centerline
DRC5527B
1 2 3
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