Mercury MerCruiser Service Manual page 485

4. Disconnect the exhaust hoses and the cooling hoses from the exhaust manifold and elbow.
g
c
5. Remove the oil filter mounting bracket bolts.
6. Disconnect both oxygen sensors and the exhaust manifold coolant temperature sensor.
To avoid the possibility of injury or component damage, use caution when lifting heavy objects. Use an appropriate lifting
device or seek assistance.
IMPORTANT: The exhaust manifold and elbow are heavy. The use of a hoist is highly recommended. If a hoist is not
available, two people should be employed for manifold removal. It may be necessary to remove the elbow and the catalyst
to reduce the weight of the assembly to an amount that is safe to lift without the use of a hoist.
90-8M0099748 eng DECEMBER 2015
g g
g g
f
b
a
b
d
Raw-water cooled
a -
b -
c -
d -
d
e -
f -
g -
e
g
c
59455
a
Freshwater cooled
a - Exhaust hose (shown attached to intermediate elbow,
other models similar)
b - Seawater bypass hose
c - Exhaust manifold coolant temperature sensor
d - Seawater hose from poppet valve
56945
CAUTION
!
© 2016 Mercury Marine
Manifolds and Elbows
Seawater drain hose
Seawater cooling hose
Seawater cooling hose
Exhaust hose (shown attached to
intermediate elbow, other models similar)
Seawater bypass hose
Exhaust manifold coolant temperature sensor
Exhaust manifold mounting screws (6)
Page 7B-11