Cam And Rocker Installation - Mercury 25 EFI Service Manual

1. Install new valve seals onto the valve guides.
a
b
2. Lubricate the valve stem with 10W‑30 4‑Stroke Marine Engine Oil.
3. Install the valve, lower seat, spring, and upper seat.
4. Compress the valve spring using the valve spring compressor and install the keepers.
b
Tube Ref No.
10W-30 4-Stroke Marine
110
Engine Oil

Cam and Rocker Installation

1. Install the upper camshaft seal. Lubricate the upper camshaft seal lip with 2‑4‑C with PTFE.
a
Tube Ref No.
2-4-C with PTFE
95
90-8M0105568 eng MARCH 2016
11521
a - Valve spring compressor
b - Valve spring keepers
a
b
11749
Description
a -
11488
Description
a - Valve seal
b - Valve guide
Where Used
Valve stem
Camshaft seal
Where Used
Camshaft seal lip
© 2016 Mercury Marine
Cylinder Head
Part No.
92-8M0078625
Part No.
92-802859A 1
Page 4B-17