Multiple Sterndrive Steering Tie Bar - FNM HPEP 225 Installation Manual

MULTIPLE STERNDRIVE STEERING TIE BAR ARRANGEMENTS
With multiple sterndrives it is important to consider which of several possible steering
systems should be selected.
Failure to observe the recommended Tie Bar Arrangements as presented in this
section could result in serious damage to the steering and/or trim system compo-
nents. This damage could adversely affect control of the boat.
INTERNAL POWER STEERING WITH INTERNAL TIE BAR ONLY
At the lower end of the performance spectrum (boats not capable of speeds in excess of
96 KMH - 60 MPH) the basic internal tie bar is recommended. It connects the slave
sterndrive to the sterndrive that is directly connected to the factory power steering output.
This internal tie bar is available in a variety of lengths from the sterndrive manufacturer.
INTERNAL POWER STEERING WITH INTERNAL AND EXTERNAL TIE BAR
As a boat moves into a moderate performance range, 96-112 KMH (60-70 MPH) or for a
reduction in steering backlash, an external tie bar should be added. External tie bars are
usually designed to attach at the aft power trim cylinder bosses which is an excellent
location because of its proximity to the propeller. HOWEVER, because of the potential
overstress that can occur if one drive is trimmed much differently than the other, a dual trim
control kit (P/N 90362A3) should be installed so as to limit this potential tilt differential to
about 20°.
CAUTION
5