Royal Enfield Classic 500 2009 Service Manual page 146

Engine Dismantling, Inspection & Assembly
✰
Check the piston pin for wear.
Measure outside dia of piston pin at
3 points.
ASSEMBLY
E X
IN
✰ Locate the oil ring expander into the
oil ring groove.
✰
Slide the bottom rail to the bottom of
the expander.
✰ Slide top rail to the top of the
expander.
✰
Place the second ring in piston
(Index mark "2 IP" facing upwards).
NOTE :
Second ring has a taper edge cross sec-
tion and is hard chrome plated.
✰ Locate the top ring (Index mark "1
IP" facing upwards).
NOTE : Top ring has rectangular cross
section with black colour (Nitride coat-
ing).
✰
Stagger piston rings end gap as
shown in Fig.
EX
NOTE : After installation, the ring should
rotate freely rotatable in the ring grooves.
CAUTION : Ensure the open end of any
piston ring does not align with the pis-
ton pin boss.
✰
Locate the piston on the connecting
rod and insert the piston pin into
the piston.
✰ Fit the circlips on either side and
ensure they are located properly in
the grooves.
NOTE : Carefully fix the piston pin clip
into the piston boss while covering Crank
case neck by shop towel / chamois cloth
as shown in Fig.
05-63
IN