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
38.
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 passsage by re-
moving 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 they should be replaced.
Restriction orifices are placed
in
the external oil lines
to regulate the quantity of oil delivered to the injec-
tion 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.
0.028
inch size at heads (0.71 mm)
0.046 inch size at Tee (1.17 mm)
To
prevent injection pump
or
valve
train damage from lack of lubrlca-
tion, ensure that all restriction orifices are kept open.
Cleaning can be done using a fine wire or drill bit and
compressed air.
OIL FILTER (Full
Flow)
The oil filter is mounted on the filter plate at the left
side of crankcase (Figure39).
It
requires replacement
every200 hoursof normal operation. Remove filter by
turning. counterclockwise, using a filter wrench.
Install new filter finger-tight plus 1/4 to 1/2 turn.
rW=)
Hot crankcase oil can cause burns if
’
it is spilled
or
splashed on skin.
Keep fingers and hands clear when removing the
011
filter and wear protective clothing.
FIGURE
39.
FULL FLOW OIL FILTER
CRANKCASEBREATHER
Late model ‘engines are equipped with a crankcase
breather pipe that vents crankcase fumes directly
from the rocker box coverto the cylinder head intake
port. The crankcase breather pipe must be cleaned
after every500 hours of engine operation by inserting
a soft wire (Figure 40).
RDJC Spec
S
engines use a breather system with a
breather pulsation damper that serves two major
functions.
It
dampens pulsations which originate
in
the intake manifold and contribute to oil carryover. It
also acts as an oil separator to condense oil vapor and
small oil droplets to prevent them from getting into
the intake manifold and combustion chamber and
causing excessive coke deposits in the valve ports.
To
disassemble, remove the breather cap from the
breather tube. At the same time, pull the baffle out of
the breather tube and clean
it.
ROCKER COVER
fi
M’/
/
BREATHER TUBE
CYLINDER HEAD
TUBE BAFFLE
FILTER
RDJC
SPECIFICATION
S
ONLY
OVERFLOW
OIL DRAIN
FIGURE
40.
CRANKCASE
BREATHER
38
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