4A-2990-13645--2 495 POWERHEAD
3. Align piston ring end gaps with ring locating pins
as shown. Check locating pins making sure they
are tight.
51082
a
b
51228
b
a
a
a - Locating Pin
b - Piston Rings
4. Remove connecting rod cap from connecting rod
being installed.
5. Install each piston with “UP” identification facing
flywheel end. Pistons MUST be installed in this
direction.
UP
Pistons must be installed very carefully into
cylinders. Piston rings can not be inspected thru
exhaust ports.
CAUTION
6. Bottom end of cylinder bore has taper which
permits the insertion of the piston into block
without using a piston ring compressor. Place
piston carefully into cylinder.
51087
Check rings by viewing through exhaust ports while
depressing rings with a screwdriver. If no spring ten-
sion is there (ring fails to “spring” back), the ring is
probably broken and must be replaced, NOW, before
installing the crankshaft.
20338
Crankshaft Installation
If Lower Bearing and Gear were removed from
crankshaft, reassemble using arbor press and
suitable mandrel for bearing; gear slides on.
(NOTE keyway and key in gear to crankshaft
assembly.)
Install main bearing retaining ring after pressing
main bearing tight against the oil gear.
NOTE:
There is NO main bearing retaining ring or re-
taining ring groove in the crankshaft on the following
outboards:
2594951084
ab
c
d
e
75/90–SERIAL NUMBER OC 259434 and above.
b
d
a - Lower Bearing
b - Gear
c - Retaining Ring
d - Seal Carrier
e - Key
If Seal Carrier above was removed, replace by
placing a piece of wood on carrier and tapping
gently with a mallet, keeping carrier “square” dur-
ing insertion, seal fully to crankshaft. See page
4A-17 -- (Powerhead Disassembly, this Section),
for wear-sleeve reinstallation, if so equipped.
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