308
GEARCASE
LEAK TEST
LEAK TEST
Drain lubricant before testing.
STEP 1
Install lubricant drain/fill plug and seal, thread
pressure test gauge fitting and seal in lubricant
level hole.
Pressurize 3 to 6 psi (21 to 42 kPa).
If pressure gauge indicates leakage, submerge
the gearcase in water to determine source of leak.
If the gearcase pressure gauge does not indicate
leakage, increase pressure to 16 to 18 psi (110 to
124 kPa). Check for leakage.
Make necessary repairs and repeat test.
STEP 2
Complete successful STEP 1 before proceeding.
Install vacuum test gauge. Apply 3 to 5 in. of vac-
uum (76 to 127 mm) Hg. with pump.
Check for leakage.
If leakage occurs, apply oil around suspected
seal. If leak then stops or oil is drawn in, that seal
is defective.
Repeat test. Gearcase must hold minimum of 15
in. (381 mm) Hg.
REMOVAL AND
INSTALLATION
Removal
Remove screw from shift lever to release the
lower shift rod.
Note where the index mark on the gearcase aligns
with the index number of the adjustable trim tab so
the trim tab can be installed in the same position.
Remove the trim tab retaining screw, gasket and
trim tab from the gearcase.
002388
WARNING
To prevent accidental starting while ser-
vicing, twist and remove all spark plug
leads.
During service, the outboard may drop
unexpectedly. Avoid personal injury;
always support the outboard’s weight with
a suitable hoist or the tilt support bracket
during service.
1. Shift rod screw 004241
1. Index mark
2. Trim tab
3. Trim tab retaining screw
COA3663
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