Crankshaft Timing Gear Installation; Thermostat, Exhaust Cover, And Anode Installation - Mercury 15 EFI FourStroke Service Manual

Cylinder Block/Crankcase
14. Tighten the bolts to the specified torque in sequence in two steps.
Description
Main bearing bolts (1–4) (M8 x 50)
Crankcase cover bolts (5–10) (M6 x 30)

Crankshaft Timing Gear Installation

1. Install the timing gear key into the crankshaft.
2. Install the timing gear.
3. Install the belt guide with the dot side up.
IMPORTANT: The belt guide outside edge is curved. Ensure the belt guide outside curved edge faces up toward the
flywheel.
4. Install the lockwasher with the bent tang inserted into the keyway on the timing gear.
5. Install the timing gear nut.
6. Install the flywheel key. Tighten the timing gear nut to the specified torque.
Description
Timing gear nut
7. Bend the lockwasher against one flat on the nut.
a
b
c
d
e

Thermostat, Exhaust Cover, and Anode Installation

1. Install the cylinder head. Refer to Section 4B ‑ Cylinder Head Installation.
NOTE: Install the spark plugs as directed, but do not install the throttle body or removed electrical components at this time.
2. Install a new exhaust cover gasket.
3. Install the exhaust cover, and start but do not tighten the five M6 x 25 screws.
Page 4A-28
1
1
9
9
5
5
4
8
8
4
a -
b -
c -
d -
e -
63944
© 2018 Mercury Marine
2
2
10 10
6
6
3
7
7
3
64052
First
Final
First
Final
Crankshaft
Nut
Lockwasher
Belt guide
Timing gear
90-8M0125265 eng NOVEMBER 2017
Nm lb‑in.
10.0 88.5
23.5 –
6.0 53.1
11.5 101.8
Nm lb‑in.
64.0 –
lb‑ft
–
17.3
–
–
lb‑ft
47.2