Page 336 - REPOWER REFERENCE GUIDE (2020)
P. 336
Steering Systems
! WARNING
On some boats, increased trim‑in range can cause handling problems at high speeds, resulting in personal injury or death.
We recommend that only qualified personnel adjust the trim‑in limit inserts and test the boat for handling problems.
c
a - Trim‑in limit spacer
b - Bolt
c - End cap
a
b 12643
Description Nm lb‑in. lb‑ft
Bolt 20–27 – 14.6–19.9
End cap 55–68 – 40.6–50.2
NOTE: A special wrench is available for removing and installing the trim cylinder end cap.
Bravo Three Boat Handling (Trim‑In Limit Inserts)
Some boats (predominantly deep‑V heavy boats) can roll up on their side under certain, specific, operating conditions. The roll
can be to either port or starboard and may be experienced while moving straight ahead or while making a turn. The roll occurs
most frequently at or near maximum speed, with the sterndrive unit trimmed at or near full IN. While the boat will not roll
completely over, the roll may be sufficient to unseat the operator or passengers and thereby create an unsafe situation.
The roll is caused by stern lift. Stern lift can be created by excessive sterndrive unit trim‑in. Under these extreme stern lift/bow
down conditions instability can be created that may cause the boat to roll. Weight distribution to the stern can reduce stern lift
and, in some circumstances, eliminate the condition. Weight distribution in the bow, port or starboard, may worsen the
condition.
All Bravo sterndrives are equipped with trim‑in limit inserts, which must be installed as shown following. On Bravo Three
applications, the trim‑in limit inserts are used to restrict the trim‑in range, and thereby reduce the stern lift. While this device
should reduce the rolling tendency, they may not eliminate the tendency entirely. The effectiveness of them can only be
determined through boat testing and is the responsibility of the boat manufacturer.
! WARNING
On some boats, increased trim‑in range can cause handling problems at high speeds, resulting in personal injury or death.
We recommend that only qualified personnel adjust the trim‑in limit inserts and test the boat for handling problems.
a a
8548 8557
Bravo One and Two (positioned forward) Bravo Three (positioned aft)
a - Trim‑in limit insert
Page 9B-12 © 2019 Mercury Marine 90-8M0149179 eng NOVEMBER 2018
