Mariner Mercury 105/140 JET, Service Manual

Page: 38 / 797

90-824052R3 JUNE 2002 IMPORTANT INFORMATION - 1D-3
Locating Centerline of Boat
Transom
Locate (and mark with pencil) vertical centerline (a)
of boat transom.
B A
D C
a
a - Centerline of Transom
NOTE: Dimensions “A” & “B” and “C” & “D” are equal
length.
Drilling Outboard Mounting Holes
IMPORTANT: Before drilling any mounting holes,
carefully read “Determining Recommended Out-
board Mounting Height,” preceding. There is a
3/4 in. (19 mm) difference between outboard
mounting holes in transom brackets.
WARNING
DO NOT, under any circumstances, allow upper
outboard mounting bolts to be closer than 1 in.
(25.4 mm) from top of boat transom. Upper
mounting bolts must never be installed thru
shims.
NOTE: When drilling into a fiberglass boat, place
masking tape directly onto boat where mounting
holes will be drilled to help prevent fiberglass from
chipping.
Use a 17/32 inch (13.5mm) diameter drill bit and drill
4 mounting holes perpendicular to and thru the
transom.
IMPORTANT: If using “Transom Drilling Fixture”
(part number 91-98234A2), use drill guide holes
marked “A” when drilling outboard mounting
holes.
b
a
a - Centerline of Transom
b - Transom Drilling Fixture (91-98234A2)
IMPORTANT: During installation of dual or multi-
ple V-6 product, the following is recommended.
A minimum of 26 inches (660mm) centerline to
centerline width is recommended. This is re-
quired to alleviate cowling interference during
lock to lock turns if one outboard would be in the
full tilt position, while the other outboard(s) are in
the vertical running position.
Applying Counter Rotation Decals
IMPORTANT: For dual outboard counter rotation
installations, the left-hand rotation outboard is
generally placed on the port side of boat
transom.
Apply “COUNTER ROTATION” decal (supplied with
left-hand rotation outboard) onto bottom cowl (rear)
of right-hand rotation outboard. Match decal place-
ment with left-hand rotation outboard.
a
b
a - Counter Rotation Decal (Left-Hand Rotation Outboard)
b - Counter Rotation Decal (Right-Hand Rotation Outboard)