Page 229 - REPOWER REFERENCE GUIDE (2020)

Single Catalyst V8 Engines
8.2 Exhaust Manifold and Elbow

Torque
Ref. No. Qty. Description Nm lb‑in. lb‑ft
1 1 Port exhaust manifold
2 1 Starboard exhaust manifold
3 2 Cylinder head to exhaust manifold gasket
4 14 Expansion plug
First 27 – 20
5 8 Screw (0.375‑16 x 3.0 in.) Second 41 – 30
Final 54 – 40
First 27 – 20
6 8 Screw (0.375‑16 x 1.75 in.) Second 41 – 30
Final 54 – 40
7 4 O2 sensor 50 – 37
8 4 O2 sensor cover
9 4 Screw (0.250‑20 hex flange) 14 124 –
10 2 Catalyst
11 2 Riser
12 2 Gasket
13 2 Fitting
14 8 Expansion plug
15 2 Plug (emissions sampling)
First 27 – 20
16 8 Screw (0.375‑16 x 0.500)
Final 46 – 34
17 2 Hose
18 4 Clamp
19 2 Vent valve assembly
20 2 Hose

90-8M0149179 eng NOVEMBER 2018 © 2019 Mercury Marine Page 7E-13