Cylinder Head Removal - Mercury 25 EFI Service Manual

Cylinder Head

Cylinder Head Removal

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. Remove the powerhead. Refer to Section 4A ‑ Powerhead Removal.
2. Remove the timing belt. Refer to Section 2C ‑ Timing Belt Removal and Installation.
3. Remove the fuel rail and the intake manifold. Refer to Section 3C ‑ Service Procedures.
4. Remove the three oil pump retaining bolts.
5. Remove the oil pump.
6. Remove the cam gear retaining bolt.
7. Carefully pry on both sides of the cam gear to remove the cam gear from the camshaft.
a
8. Remove the two fuel pump retaining bolts.
9. Remove the fuel pump.
10. Remove the eight cylinder head cover bolts.
11. Remove cylinder head cover.
b
a
Page 4B-10
a
11499
a -
b -
b
11503
a - Cylinder head cover bolts (8)
b - Fuel pump retaining bolts (2)
a
11485
© 2016 Mercury Marine
a - Oil pump retaining bolts (3)
Cam gear retaining bolt
Pry points
90-8M0105568 eng MARCH 2016