Evinrude E-tec 75 HP, Service Manual

Page: 246 / 344

246
MIDSECTION
EXHAUST HOUSING
Cleaning and Inspection
Clean all parts with parts cleaning solvent and dry
with compressed air. All nut and screw threads
coated with thread locking material must be thor-
oughly cleaned before assembly. When using a
thread locking product, be sure to prime the
threads with
Locquic Primer
.
Examine the upper and lower thrust mounts, and
replace if deteriorated or damaged.
Before checking the exhaust housing for distor-
tion, thoroughly clean the top and bottom mating
surfaces and remove all sealer and corrosion.
Check the exhaust housing for distortion. Place
the housing on a surface plate. Use a dial indica-
tor to check flatness by measuring the run-out on
the top edge of housing. The maximum allowable
run-out is 0.009 in. (0.228 mm). If you do not have
access to a dial indicator and surface plate, seek
the services of a machine shop. DO NOT attempt
to straighten a distorted housing; replace it.
IMPORTANT:
A distorted exhaust housing will
cause the upper driveshaft splines to wear exces-
sively and will damage the crankshaft splines.
Inspect the water tube for obstructions or kinks,
which may restrict water flow.
Assembly
Position a new gasket between the exhaust
megaphone and adapter housing. Apply
Ultra
Lock
to the threads of the screws and torque to 60
to 84 in. lbs. (7 to 9.5 N·m).
Place a new grommet on the water tube and coat
the outside edge with
Adhesive 847
.
WARNING
Wear safety glasses to avoid personal
injury, and set compressed air to less than
25 psi (172 kPa).
DR2223
1. Adapter to megaphone screws
2. Exhaust megaphone
001976
1. Water tube grommet
2. Flared end of water tube
001977
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2
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