Mercury MERCRUISER, Service Manual, Page: 133 / 566

IMPORTANT: Long trunnion installation: The trunnions are 14 cm (5.5 in.) long. The trunnions included in the front engine
mounts are shorter to allow them to be fully retracted without interfering with components on the engine. Use the 14 cm
(5.5 in.) trunnions, if the ones already in the mounts do not allow enough adjustment outward.
Before installing the engine into the vessel, ensure that the trunnions used in the front engine mounts are long enough to
span the required distance. If they are not, use the long trunnions.
1. Remove the short trunnions from the front engine mounts.
2. Insert the long trunnions into the front engine mounts.
3. Install and align the engine.
4. Ensure that the trunnion clamping bolts and locknuts are tightened to the specified torque.
Description Nm lb‑in. lb‑ft
Trunnion clamping bolt and locknut 68 – 50.2
Typical front engine mount
a - Trunnion
b - Trunnion clamping bolt and locknut
7. Tighten the clamping bolts and nuts slightly to prevent them from moving in or out. The mounts must be free to pivot when
installing the engine.
Front mount
a - Locking nut
b - Adjusting nut
c - Trunnion clamp bolt and nut with lockwasher
d - 10 mm + 2 mm (3/8 in. + 1/16 in.)
e - 67 mm + 2 mm (2‑5/8 in. + 1/16 in.)
57597
a
b
b
c
f
58429
a
e
d
Installation
90-8M0099748 eng DECEMBER 2015 © 2016 Mercury Marine Page 2B-29