‘CRANKCASE
BREATHERS
OIL LINES
At overhaul time the rocker box oil line should be
flushed with fuel, and a fine wire used to clean the
small holes, Figure 40. Clean standpipe breather on
four cylinder engines.
Clean out all other oil lines and drillings with com-
pressed air whenever the engine is disassembled or
overhauled. Reach the
oil
gauge passage by remov-
ing the oil filter mounting plate.
External oil lines, the rocker box oil line, and the
internal oil line to the rear bearing are replaceable, if
damaged.
Restriction orifices are placed in the external oil lines
to regulate thequantity of oil delivered to theinjection
pump gearing and tappet and to the rocker arm and
valve train areas. Two orifices are located in the Tee
fitting at the injection pump and one orifice is located
in the inlet fitting to each cylinder head.
To
prevent injection pump or valve train
Ex3
damage from lack
of
lubrication, ensure that
ail restriction orifices are kept open. Cleaning can be done using a
fine wire or drill bit and compressed air.
CAUT,ON
.028
inch size at heads (0.71 mm)
.046 inch size at Tee (1.17 mm)
..
OIL FILTER (Full Flow)
..
.
The oil filter is mounted on the filter plate at the left
side of crankcase, Figure 41.
It
requires replacement
every
500
hours of normal operation. Removefilter by
turning counterclockwise using afilter wrench. Install’
new filter finger-tight plus 1/4 to 1/2 turn.
FIGURE
41.
FULL FLOW
OIL
FILTER
The
RDJE
crankcase breather has a valve assembly
that compensates
for
the pulses created by both
pistons moving up and down at the same time. The
ball check valves close as the pistons move up and are
forced open as the pistons move down, thus, venting
crankcase pulse pressure and fumes
to
thecarburetor
intake hose. The only maintenance required is to
clean the check valve assembly and replace the baffle
material periodically. Remove the hose clamp,
breather hose, and cap clamp to release the breather
cap and valve assembly, Figure
42.
Wash the cap,
valve assembly, and baffle material
in
a suitable
solvent and reinstall.
The
RDJEA
crankcase is vented by a breather pipe
installed in the intake manifold, under the valve cover.
A
breather hose between the crankcase and the valve
cover vents the crankcase pressure and fumes to the
intake manifold.
Since one piston moves up while the other moves
down, pulse pressure is minimal;
it
is equalized by the
pistons moving
in
opposite directions.
-
-
BREATHER
HOSE
HOSE
CLAMP
\
VALVE
7
“0”
RING
’
SCREEN
/
CAP AND
/
A
-
CLAMP
BAFFLE
FIGURE 42. CRANKCASE BREATHER
OIL DRAIN EXTENSION
For service convenience, install a short (less than
10
inches
[254
mm]) oil drain extension made from
standard pipe and fittings
in
the l/Pinch (12.70 mm)
pipe-tapped oil drain hole in the base.
32
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