Yanmar 4JH2E Service Manual page 49

Chapter 2 Basic Engine
~4::,·_:"_:i;:_st::;o;::n:_a:::':::'d::....:.f'..::is:.:t.:o:.:n_:I',.;1:;,:·n::.s
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ 4Jf1E•4Jfl-TE
4·3.3 Replacing the piston rings
(1)
Thoroughly clean the ring grooves when replacing
piston rings.
(2) The side with the manufacturer's mark (near piston ring
gap) should face up.
The side with the maker
mark faces up
(3) After fitting the piston ring, make sure it moves easily
and smoothly.
(4) Stagger the piston rings at 120° intervals, making sure
none of them line up with the piston.
1st compression ring
(
2nd compression rinq
1st compression ring
2od--1~"'°,--~"'
compression ring
Oi! ring
2·16
•
5
•
•
•
0.
l
0
•
u
~
;;
0
c
0
n
~
0
1st compression ring
2nd compression ring
Direction of
piston pin
Oil ring
(5) The oil ring is provided with a coil expander. The coil
expander joint should be opposite (staggered 180°) the
oil ring gap.
I
'
Gap
Joint of
coil expander
Printed in Japan
AOAJ029-9002