Dual-Outboard Alignment - BRP E250DHLSCS Service Manual

Dual-Outboard Alignment

Dual outboards must be connected with a tie bar
and adjusted to align the outboards for correct
water flow to the gearcases and propellers.
Incorrect outboard alignment could cause one or
more of the following:
Propeller ventilation
•
Reduction of top speed
•
Improper boat tracking
•
Engine overheat and powerhead damage
•
Follow the instructions provided by the tie-bar
manufacturer for tie bar installation and adjust-
ment.
Measure Alignment
The "toe-in" (gearcase leading edges closer
together than propeller shaft centers) or "toe-out"
(gearcase leading edges farther apart than pro-
peller shaft centers) is determined as follows:
Position outboards straight with the anti-ventila-
•
tion plates parallel with the bottom of the boat.
Measure between propeller shaft centers.
•
Measure between leading edges of gearcase.
•
INSTALLATION AND PREDELIVERY
Alignment Adjustment
Various boat/motor combinations respond differ-
ently to dual-outboard alignments. Each applica-
tion must be thoroughly tested until the ideal
combination of performance, steering, and cooling
is found.
A common practice is to set-up the outboards par-
allel, or with a small amount of "toe-out," and
adjust inward until best results are achieved.
A typical set-up with 2-stroke outboards
•
mounted directly on the transom often runs best
with a slight amount of "toe-in."
Outboards mounted behind the transom on
•
motor brackets usually require "parallel" align-
ment or "toe-out."
Adjust the outboard alignments by adjusting tie
bar. Follow the tie bar manufacturer's adjustment
procedures.
Check steering operation. Make sure that the
steering system operates properly at various trim
angles.
Confirm Alignment
To confirm proper alignment, perform the follow-
ing steps:
Water test the boat.
•
Monitor the water pressure for both outboards.
•
Run the boat at various trim angles.
•
Perform steering maneuvers and vary the throt-
•
tle settings.
Monitor boat and outboard performance.
•
A sudden loss of water pressure or excessive pro-
6365
peller ventilation on one or both outboards may
indicate a misalignment of the gearcases. Reset
the outboard alignment and retest.
6340
FINAL ADJUSTMENTS
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