Northern Lights OLP LP445, Operator'S Manual

Page: 16 / 36

OLP 05/00
6. Install injection nozzles:
NOTE:
Before installing injection nozzles, make sure
nozzles are clean and free from oil or grease. Do not
grease or oil the nozzles.
a. Remove plug (if installed previously) from nozzle
bore in cylinder head and blow out bore with
compressed air.
b. Make sure that the sealing surface of the cylinder
head (on which the seal washer will be resting) is
smooth and free of damage or dirt. This could
prevent proper sealing. Dirt and roughness could
also cause distortion to nozzle when the attaching
screw is tightened, making the valve stick.
c. Install nozzle in cylinder head using a slight
twisting motion as nozzle is seated in bore.
Figure 14: Shows relationship of parts required for installation.
d. Install spacer and cap screw. Do not tighten
capscrew at this stage.
e. Connect fuel pressure line to nozzle. Leave
connection slightly loose until air is bled from
system.
f. Tighten nozzle hold-down cap screws to 27 foot
lb. (37 N•m).
g. Install leak-off assembly.
h. Bleed air from loose injection line connection.
Tighten connection using two wrenches.
SP13. INJECTION PUMP
1. Since operating conditions may vary considerably,
it is difficult to give a definite service interval. But,
as a rule, the pump settings, maximum speed, idle
speed and exhaust smoke should be checked by your
dealer after every 2400 hours of operation. Service
of the fuel injection pump should only be done if
checks indicate pump malfunction.
2. Black smoke can be an indication of pump
malfunctions. Before servicing pump, check the
other possible causes.
a. Check cleanliness of air filter.
b. Check valve clearances.
c. Clean and check injectors.
3. Any repair which involves disassembly of the injection
pump must be carried out by specially-trained
mechanics with the proper tools and test devices.
NOTE:
All warranties on the engine become null and
void if the injection pump seals are broken by unau-
thorized persons.
DB4 AND DB2 INJECTION PUMPS – REMOVAL
All Stanadyne DB2 and DB4 injection pumps will
have a retained drive shaft (shaft stays in pump when
pump is removed from engine).
1. Clean the fuel injection pump, lines and area around
the pump with cleaning solvent or a steam cleaner.
IMPORTANT: Never steam clean or pour cold water
on a fuel injection pump while the pump is running
or while it is warm. Doing so may cause seizure of
internal rotating pump parts.
2. Disconnect shutoff cable and speed control link -
age or cold start switch, if equipped. Disconnect
electrical connection to shutoff solenoid or throttle
positioning solenoid. Tag electrical wires for correct
reassembly.
IMPORTANT:
Always use a backup wrench when
loosening or tightening fuel lines at injection pump
so that discharge fittings are not altered which will
prevent internal pump damage.
3. Disconnect fuel return line
(Figure 15-A)
and fuel
supply line
(Figure 15-C)
.
Figure 15
Reproduced by permission of Deere & Company, c2000. Deere & Company, All rights reserved.
14
Servicing