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
77.
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. The oil gauge passage may be reached
by removing the oil filter mounting plate.
External oil lines, the rocker box oil line, and the
internal oil line to the rear bearing are replaceable.
Restriction orifices are placed
in
theexternal 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.
To
prevenf injection pump or valve
train damage from lack of iubrica-
fion,
ensure fhaf ail restriction orifices are kept open.
Cleaning can be done using
a
fine wire or drill bit and
compressed air.
0.028 inch size at heads
(0.71
mm)
0.046
inch size at Tee
(1
.I
7
mm)
OIL FILTER (Full Flow)
The oil filter is mounted on the filter plate at the left
side of crankcase (Figure78). It requires replacement
every 200 hours of normal operation. Remove filter by
turning counterclockwise, using a filter wrench.
Install new filter finger-tight plus
1/4
to
1/2
turn.
FILTER
FIGURE
78.
FULL FLOW OIL FILTER
Hot crankcase
011
can cause burns if
if is spilled
or
splashed on skin.
Keep flngers and hands clear when removing
fhe
oil
filter and wear profecfive clothing.
CRANKCASEBREATHER
'
MDJA Begin Spec
R,
MDJB Begin Spec
S,
and
MDJE
These engines are equipped with a ball check valve
for maintaining crankcase vacuum. The only mainte-
nance required is to clean the components periodi-
cally. Remove the hose clamp, breather hose, and
breather cap clamp to release the breather cap and
valve assembly. Wash cap and valve assembly and
the baffle in suitable solvent and reinstall.
CAP
AND
VALVE
BREATHER TUBE
FIGURE
79.
CRANKCASE BREATHER
AMP
CRANKCASEBREATHER
MDJC, MDJF Begin Spec
T
These eng
i
nes are equ
i
pped with a crankcase breather
pipe that vents c,rankcase fumes directly from the
rocker box coverto the cylinder head intake port (see
Figure 80). The crankcase breather pipe must be
removed and cleaned after every500 hours of engine
operation.
A
clogged breather pipe may result in oil
leakage at the rocker box gaskets and oil filter seal.
ROCKER
COVER
CYLINDER HEAD
FIGURE
80.
CRANKCASE BREATHER PIPE
64
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