Paragraphs
146C-147A
crease spring pressure on oil pressure
relief valve as a cure for a worn pump.
To prevent possible damage to the
drive shaft oil seal, install the pump
drive shaft oil seal, then install the
pump drive shaft as follows: With
the oil seal in place, temporarily in-
stall the idler shaft in the pump body
at oil seal end of pump. With the idler
shaft extending through the oil seal,
insert the drive shaft into the pump
body, from drive end, until drive shaft
butts against the idler shaft. Press
drive shaft into position, forcing the
idler shaft out of the pump body. The
remainder of the assembly procedure
is evident.
OIL
PRESSURE RELIEF VALVE
146C.
Normal oil pressure of 25 psi
is controlled by a spring-loaded oil
pressure relief valve. The pressure
is adjusted by a slotted screw (26—
Fig.
AC60A) on left front side of
crankcase. If difficulty is encountered
when attempting to regulate the oil
pressure, check the driUed cap screw
which holds the camshaft gear thrust
plate in place. If the screw is too
long,
it will interfere with the valve
action. The drilled cap screw dimen-
sions are
T^-14 X
-^ inch.
Fig.
AC60A—Oil pressure relief valve
ex-
ploded
from left front side
of
cylinder
block.
25.
Nut
26.
Pressure adjusting
screw
27.
Gasket
28.
Relief valve spring
29.
Relief valve
ALLIS-CHALMERS
147.
QUICK CHECKS—UNITS
ON
TRACTOR. If the diesel engine does
not start or does not run properly,
and the diesel fuel system is suspected
as the source of trouble, refer to the
Diesel System Trouble Shooting Chart
and locate points which require fur-
ther checking. Many of the chart
items are self-explanatory; however,
if the difficulty points to the fuel
filters,
injection nozzles and/or injec-
tion pump, refer to the appropriate
paragraphs which follow:
FUEL FILTERS
The fuel filtering system consists of
a metal sediment bowl, primary filter
of the replaceable element type, an
intermediate filter of the replaceable
element type, and a final (secondary)
filter of the sealed type.
147A.
CIRCUIT DESCRIPTION
AND
MAINTENANCE. Fuel from the fuel
tank flows through a metal sediment
bowl (A—Fig. AC60B) which should
be removed, drained and cleaned each
DIESEL FUEL SYSTEM
The diesel fuel system consists
of
three
basic units;
the
fuel filters, injection pump
and injection nozzles. When servicing
any
unit associated with
the
fuel system,
the
maintenance
of
absolute cleanliness
is of
utmost importance.
Of
equal importance
is
the avoidance
of
nicks
or
burrs
on any of
the working parts.
Probably
the
most important precaution
that service personnel
can
impart
to
owners
of diesel powered tractors,
is to
urge them
to
use an
approved fuel that
is
absolutely
clean
and
free from foreign material. Extra
precaution should
be
taken
to
make certain
that
no
water enters
the
fuel storage tanks.
This last precaution
is
based
on the
fact
that
all
diesel fuels contain some sulphur.
When water
is
mixed with sulphur, sulphuric
acid
is
formed
and the
acid will quickly
erode
the
closely fitting parts
of the
injection
pump
and
nozzles.
Fig.
AC60B—Metal sediment bowl
(A) and
tke
first
stage,
renewable element type
fuel
fiiter
(B).
DIESEL
SYSTEM TROUBLE SHOOTING CHART
Sudden Lack Engine Irregular
Stopping
of
Hard Engine
of
Engine Power
to
Start Operation
Lack
of
fuel
* * * *
Water
or
dirt
in
fuel
* * * *
Clogged fuel lines
it "A* ^ "^
Inferior fuel
^ i^ * *
Faulty transfer pump
'AT ^ TAT 'K
Faulty injection pump timing
'AT ^ «
Air traps
in
system
M « ^ ^
Clogged fuel fUters
* * *
Deteriorated fuel lines
^
Air leak
in
suction line "AT
'
Faulty nozzle
«
Sticking pump plunger
W *«
Binding pump control rod
T^
Weak
or
broken governor springs
«
Fuel delivery valve
not
seating properly
'W
Weak
or
broken transfer pump plunger spring
'AT «
Improperly
set
smoke stop
"A*
Broken spring
in
by-pass valve
if
Engine
Knocks
Engine
Smoking
ExcessiT*
Fuel
Consumption
•
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