Service Manual
61
61
LUBR
I
CAT
I
NG
SYSTEM
NOT
E
:
Detergent engine oil delays formation of gum and
varnish.
Do
not add any additives to detergent oil.
2.
Select oil viscosity depending on expected environmental
temperature as shown.
If slinger
is
damaged, replace
it.
Function of breather
is
to keep vacuum
in
crankcase avoid-
ing oil being forced
out
of engine.
Reed valve controls direction of air flow caused by piston
movement
so
that air flow from inside to outside can pass
reed valve but not from outside to inside.
Oil laden air in crankcase passes through first reed valve
(A) and expands in valve chamber, where some portion
of
oil
is
separated from air and returns to crankcase through hole
(B)
.
The
air passes through second reed valve
(C)
and expands
in
breather chamber (D), where remained oil
is
separated from
air and drain to valve chamber through hole
(E).
Then air passes through maze in breather chamber (D) and
is
vented to intake pipe through tube
(G).
-20°c
-10°c
0°c
IO°c
20°c
30°c
40°C
-4°F
14°F
32°F
5O°F
68°F
86’°F
104°F
E4OPCOIWI
E4OFCIOWI
E4OFC11W2