Transom Measuring And Drilling - BRP Johnson J30TEL4SUA 2007 Service Manual

Transom Measuring and Drilling

Hull Centerline
Locate the centerline of the boat transom as it
relates to the hull (bottom) of the boat.
Use a straightedge to draw a line connecting the
port and starboard chines. The chines should be
used as reference points for determining the cen-
terline of the hull.
Use a framing square to accurately place a line on
the transom. The centerline of the hull should be
in line with the keel of the hull and perpendicular
to the midpoint of the line connecting the port and
starboard chines.
1 2 3
1. Chine
2. Strake
3. Keel
4. Hull centerline
Transom Heights
Make sure the transom height is consistent with
the height 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.
Use a straightedge as a reference to extend the
bottom of the boat.
Position the straightedge along centerline. The
distance from the top edge of the straightedge to
the top edge of the transom is the actual transom
height.
1. Top edge of transom
2. Actual transom height
Transom Drilling Locations
Refer to Drilling and Hardware Diagram on
p. 36 for measurements. Or, use the outboard
stern brackets as a template for location and size
of holes to drill in the transom.
4
Center the outboard on the transom (or mounting
DR5568
bracket) and tighten clamp screws by hand. An
accessory transom plate is recommended to pro-
tect the transom.
Using each stern bracket's mounting holes as a
guide, drill holes through the transom.
IMPORTANT:
perpendicular to transom surface.
INSTALLATION AND PREDELIVERY
OUTBOARD INSTALLATION
Be sure to drill the required holes
2
1
2
DR5541
35