Mercury 20 EFI FourStroke

Intake/Exhaust Valve Components
Ref. No. Qty. Description
Torque
Nm lb‑in. lb‑ft
1 2 Intake valve
2 2 Intake valve stem seal
3 4 Valve spring seat
4 4 Valve spring
5 4 Retainer
6 8 Keeper
7 4 Adjusting screw
8 4 Rocker arm
9 4 Locknut 7.0 62 –
10 2 Collar
11 2 Exhaust valve
12 2 Exhaust valve stem seal
13 2 Rocker shaft spring
14 2 Washer
15 1 Rocker arm shaft
Cylinder Head
90-8M0125265 eng NOVEMBER 2017 © 2018 Mercury Marine Page 4B-7