Page 227 - REPOWER REFERENCE GUIDE (2020)

Single Catalyst V8 Engines
5.7 MPI, 6.2 MPI, 5.7 Horizon, and 6.2 Horizon

Torque
Ref. No. Qty. Description Nm lb‑in. lb‑ft
1 1 Exhaust manifold assembly (port shown, starboard similar)
2 1 Manifold‑to‑cylinder‑head gasket
3 1 Brass pipe fitting (standard cooling)
4 1 Straight fitting (closed cooling)
5 1 Elbow assembly—no riser (port shown, starboard similar)
1 2 in. riser assembly set (includes port and starboard)
1 4 in. riser assembly set (includes port and starboard)

6 1 6 in. riser assembly set (includes port and starboard, and required
fitting)
1 8 in. riser assembly set (includes port and starboard, and
reference item number 27)
1 Elbow‑to‑manifold gasket (closed cooling)
7
1 Elbow‑to‑manifold gasket (seawater cooling)
8 1 Plug
9 1 Brass pipe fitting
10 2 Oxygen sensor 50 37
11 1 Port elbow fitting assembly (seawater cooling)
12 2 Oxygen sensor cover bracket
13 2 Screw 3 28
14 1 Manifold straight fitting (closed cooling)
15 4 Screw 49 36
16 1 Exhaust manifold coolant temperature sensor 16 142
17 1 Catalyst
18 6 Screw 41 30
19 1 Manifold fitting assembly (seawater cooling)
20 1 Manifold fitting O‑ring (seawater cooling)
21 1 Manifold fitting check ball (seawater cooling)
22 1 Fitting on manifold (seawater cooling)
23 1 Starboard elbow straight fitting (seawater cooling)
23 2 Port and starboard elbow straight fitting (closed cooling)
1 Riser fitting assembly, 0, 2, and 4 in. risers with closed cooling
24 Riser fitting assembly, 6 and 8 in. risers with closed cooling
1 (includes reference item 6)
25 1 Riser fitting O‑ring
26 1 Riser fitting check ball
27 1 Fitting on riser
NOTE: The port exhaust assembly is shown; starboard is similar.

90-8M0149179 eng NOVEMBER 2018 © 2019 Mercury Marine Page 7E-11