Mercury 45 Jet 50-55 Service Manual page 168

1. Install piston ring in appropriate groove on piston using
Piston Ring Expander Tool. Spread rings just enough
to slip over piston.
Top Groove – Chromed Ring
Bottom Groove – Steel Ring
2. Check piston rings to be sure they fit freely in groove.
Lubricate rings and cylinder wall with 2-cycle oil.
b
a - Piston Ring Expander
b - Piston Rings
3. Align piston ring end gaps with ring locating pins as
shown. Check locating pins making sure they are tight.
a
b
a - Locating Pin
b - Piston Rings
90-817643R1 DECEMBER 1996
4. Remove connecting rod cap from connecting rod be-
5. Install each piston with "UP" identification facing fly-
a
!
PE-51081
Pistons must be installed very carefully into cylinders.
Piston rings can not be inspected thru exhaust ports.
6. Bottom end of cylinder bore has taper which permits
a
b
PE-51228
a
PE-51082
ing installed.
wheel end. Pistons MUST be installed in this direction.
UP
CAUTION
the insertion of the piston into block without using a pis-
ton ring compressor. Place piston carefully into cylin-
der.
PE-51087
POWERHEAD - 4-29