Mercury 250 Jet Drive - Mercury Jet Drive Hull Dimensions

250 HP JET DRIVE INSTALLATION MANUAL
Page 15
90-10240040 DECEMBER 2003
Mercury Jet Drive Hull Dimensions
HULL OPENING
The pump to powerhead opening in the hull is the most important factor to consider in a Jet
Drive installation. There are three areas of concern:
1. Location (a) of the pump to powerhead hull opening relative to the boat bottom for proper
ride plate seal fit.
2. Dimensional control of the opening - corner radii (b), straightness (c) and size (d) for
proper grommet installation, and corner radii (e) for ride plate seal fit.
3. Flatness and thickness of the area around the hull opening for proper grommet sealing
(see drawing on next page).
4. The hull opening must have a 0.125 in. radius on both the top and bottom corners all
around the opening.
1 1/16 +/– 1/16
3/4 +/– 1/16
7 1/16 +/– 1/16
16 1/4 +/– 1/16
14 11/16 +/– 1/16
14 5/16 +/– 1/16
2 9/16 +/– 1/16
12 1/8 +/– 1/16
3 13/16 +/– 1/16
3 5/8 +/– 1/16
b - Corner Radii
c and d - Size and Straightness
a - Location
Tunnel Dimensions (in inches)
a
b
c
e
a
a
d
c
d
28249
4.07  .06
a
e - Corner Radii for Ride Plate