Cylinder Head Installation - Mercury 25 EFI Service Manual

Tube Ref No.
10W-30 4-Stroke Marine
110
Engine Oil
6. Lubricate the exhaust rocker shaft with 10W‑30 4‑Stroke Marine Engine Oil.
Tube Ref No.
10W-30 4-Stroke Marine
110
Engine Oil
7. Install the spacer, springs, washers, and rocker arms.
8. Install the rocker arm retaining bolts. Tighten the rocker arm retaining bolts to the specified torque.
9. Install the oil galley cover. Retain the oil galley cover with a bolt. Tighten the bolt to the specified torque.
a
Description
Rocker arm retaining bolt (2)
Oil galley cover bolt
10. Install the oil pump. Refer to Section 4C ‑ Oil Pump.

Cylinder Head Installation

IMPORTANT: This engine utilizes an interference valve train design. Do not rotate the crankshaft or cams when the timing belt
is removed from the cam gears or crankshaft gear unless advised to do so. Failure to adhere to this caution may result in valve
and or piston damage.
1. Rotate the crankshaft so the number one piston (top piston) is at TDC.
2. Install the camshaft gear key onto the camshaft.
3. Install the camshaft gear onto the camshaft. Install the washer and bolt to retain the camshaft gear. Tighten the bolt to the
specified torque.
90-8M0105568 eng MARCH 2016
Description
Description
b
Where Used
Intake rocker shaft
Where Used
Exhaust rocker shaft
c
11496
© 2016 Mercury Marine
Cylinder Head
Part No.
92-8M0078625
Part No.
92-8M0078625
a - Spacer
b - Rocker arm retaining bolts
c - Oil galley cover
Nm lb. in.
9 80
6 53
Page 4B-19
lb. ft.