Mercury 25 EFI Service Manual page 290

Cylinder Head
2. Inspect the camshaft bearing surfaces and rocker arm contact surface for damage. Ensure the compression release arms
move freely.
a - Standard camshaft
b - Compression release arm
NOTE: Use caution when installing the camshaft to prevent damage to the cylinder head camshaft bearing surfaces.
3. Lubricate the camshaft and the cylinder head camshaft bearing surfaces with 10W‑30 4‑Stroke Marine Engine Oil. Install
the camshaft into the cylinder head.
a
c
Tube Ref No.
10W-30 4-Stroke Marine
110
Engine Oil
4. Lubricate the intake rocker shaft with 10W‑30 4‑Stroke Marine Engine Oil.
5. Install the intake rocker shaft, washers, springs, and rocker arms.
IMPORTANT: Install the washers with the rounded edge toward the rocker arm.
a
Page 4B-18
b
a
d
Description
Camshaft, cylinder head and camshaft bearing surface
a - Washer
b - Rocker arm
b
11492
© 2016 Mercury Marine
a
b
a - Camshaft bearing surfaces
b - Cylinder head camshaft bearing surfaces
c - Fuel pump lobe
d - Cam lobes
e - Camshaft seal area
e
11752
Where Used
20949
Part No.
92-8M0078625
90-8M0105568 eng MARCH 2016