Mercury 20 EFI FourStroke

Cylinder Head Components
Ref. No. Qty. Description
Torque
Nm lb‑in. lb‑ft
1 1 Cylinder head gasket
2 2 Dowel pin
3 1 Cylinder head
4 1 Oil seal
5 6 Screw (M8 x 60)
First 10.0 88.5 –
Final 30.0 – 22.1
6 2 Screw (M6 x 25)
First 6.0 53.1 –
Final 10.0 88.5 –
7 3 Washer
8 1 Screw (M6 x 40)
First 6.0 53.1 –
Final 10.0 88.5 –
9 1 Screw 2.0 17.7 –
10 1 Anode
11 1 O‑ring
12 1 Anode plug 18.0 159.3 –
13 2 Spark plug 18.0 159.3 –
14 1 Cylinder head cover gasket
15 4 Screw 1.5 13.3 –
16 1 Breather chamber cover
17 1 Cylinder head cover
18 4 Screw (M6 x 30) 6.0 53.1 –
19 1 Oil filler cap
20 1 O‑ring
21 1 Nipple
Cylinder Head
90-8M0125265 eng NOVEMBER 2017 © 2018 Mercury Marine Page 4B-5