Torque Specifications; External Engine Components - Mercury MerCruiser Service Manual

Water trapped in the seawater section of the cooling system can cause corrosion or freeze damage. Drain the seawater
section of the cooling system immediately after operation or before any length of storage in freezing temperatures. If the boat
is in the water, keep the seacock closed until restarting the engine to prevent water from flowing back into the cooling system.
If the boat is not fitted with a seacock, leave the water inlet hose disconnected and plugged.
IMPORTANT: Lubricate all moving engine components with clean engine oil or other specified lubricant during assembly.

Torque Specifications

External Engine Components

Description
Alternator mounting fasteners
Engine coolant temperature (ECT) sensor
Engine mount, front bracket
Exhaust manifold screws—use torque sequence listed
for each pass
4
1
6
Exhaust elbow screws—tighten screws using an
X‑pattern, use torque sequence listed for each pass
3
2
Fuel rail bracket screws
Coil to coil bracket screws
MAPT sensor screw
Seawater pump bracket to block
Seawater pump bracket to block—steel stud/nut
Starter motor screws
Engine flywheel screws
Engine block coolant drain hole plug
Flywheel housing studs and screws
Flywheel housing cover
Oil drain plug
Oil pressure sensor—top of engine
Oil line to oil filter base screws
Oil pump cover screw
Thermostat cap to crossover screws—standard and closed cooling
Crossover to head screws—standard and closed cooling
Throttle body screws
Water circulating pump fasteners—3 screws, 1 stud
Water pump pulley screws
90-8M0099748 eng DECEMBER 2015
NOTICE
First pass
Second pass
2
5
3
Final pass
59457
First pass
1
Final pass
4
57899
Nm
16.3
12.2
40.6
67.7
47.5
13.1
10.5
© 2016 Mercury Marine
Engine Disassembly
lb‑in.
27 –
144.2
62 – 45.7
27 –
54 – 39.8
54 – 39.8
46 – 33.9
46 – 33.9
108
4.5 39.8
7 61.9
– 29.9
– 49.9
–
80 –
20 177
50 – 36.9
9 79.6
24 – 17.7
17 150.4
115.9
92.9
27 –
27 –
11 97.3
29 – 21.4
27 –
Page 3A-5
lb‑ft
20
–
20
–
–
–
35
59
–
–
–
–
–
20
20
–
20