Mercury MERCRUISER - Page 479

Exhaust Manifold and Elbow Exploded View
Ref. No. Qty. Description
Torque
Nm lb‑in. lb‑ft
1 1 Exhaust manifold assembly
2 10 Expansion plug
3 1 Gasket
4 6
Screw (0.375‑16 x 4.75)
1
3
2
4
6
59457
5
First
27 – 20
Second
54 – 39.8
Final
54 – 39.8
5 1 Catalyst (ECT only)
6 1 Oxygen sensor—narrowband (ECT only) 50 – 36.8
7 1 Elbow assembly
8
2 Screw (0.250‑20 x 0.380 hex flange head) (ECT)
11.6 102.6 –
1 Screw (0.250‑20 x 0.380 hex flange head) (non‑ECT)
9
2 Cover bracket (ECT)
1 Cover bracket (non‑ECT)
10 1 Post O2 sensor plug (non‑ECT) 50 – 36.8
11 1 Copper washer (non‑ECT)
12 4
Screw (0.375‑16 x 2.5 hex flange head)
1
2
3
4
57899
First
46 – 34
Final
46 – 34
13 1
Gasket, elbow to manifold with open water ports (seawater
cooling)
13 1
Gasket, elbow to manifold with blocked water ports (closed
cooling)
14 2 Brass pipe plug (0.25‑8)
15 1 Brass pipe fitting (seawater cooling) (0.750‑4) 50 – 36.8
16 1 Expansion plug
17 1 Exhaust manifold temperature sensor assembly 16 142 –
18
1 Seawater cooling uses #28
50 – 36.8
2 Straight fitting (0.750‑14) (closed cooling)
19 1 Fitting assembly—seawater cooling 50 – 36.8
20 1 O‑ring
21 1 Ball
22 1 Fitting
23 1 Rubber ball seat 50 – 36.8
24 1 Straight fitting (0.750‑14) (closed cooling)
25 1 Brass plug 50 – 36.8
26 1 Straight fitting (0.750‑14) (closed cooling) 50 – 36.8
27 2 Wideband oxygen sensor 50 – 36.8
28 1 Straight fitting with threaded hole (0.750‑14 with 0.25‑18 hole) Hand‑tight—plus two turns
29 1 Check valve 16 142 –
Manifolds and Elbows
90-8M0099748 eng DECEMBER 2015 © 2016 Mercury Marine Page 7B-5