109823 2/09 3-17
by authorized service personnel, only. Any service done by unauthorized personnel, will void the
injection pump warranty.
Note: No service parts are available for the fuel injection pump.
Trouble-shooting
Nozzle and holder
Specifications
Structure and functions
The nozzle is a precision assembly used to inject the fuel, which is fed from the injection pump under pressure, to the
combustion chamber. It consists of the components as shown in Fig. 3-42 on page 3-18. The fuel is fed under pressure,
from the oil hole of the nozzle holder main body to the nozzle body. When the pressure exceeds the specified value, the
spring is compressed opening the valve, allowing the fuel to be injected into the combustion chamber. At the same time,
the fuel lubricates and cools the nozzle and nozzle body. Excess fuel is returned to the tank by the return line.
Symptom Possible Cause Check or Remedy
1. Engine does not
start.
1. Empty fuel tank or air mixed in fuel.
2. Defective engine stop solenoid.
1. Fill fuel tank, check for air entering
system, bleed air.
2. Check and replace the electric system.
2. Engine starts but
will not stop at
once.
1. Filter or lines clogged.
2. Air mixed in fuel.
3. Fuel tank filter cap air breather clogged.
4. Short-circuit or disconnected wire in
wiring harness to engine stop solenoid.
1. Replace or clean out.
2. Check fuel lines and connections.
3. Wash
4. Inspect and repair.
3. Engine output
unstable
1. Air mixed in fuel.
2. Water mixed in fuel.
1. Check fuel lines and connections.
2. Replace fuel, replace filter.
For additional trouble-shooting, refer to Section 6: Trouble-Shooting
Part No. 131406440 Pintle dia. ø 0.0394 in(1 mm)
Assembly No. 105148-1210 Valve opening 185.65-1778.16 PSI
(1.28–12.26 MPa)
{115–125 kgf/cm
2
}
Nozzle holder 105078-0100
Nozzle 105007-1170 (NP-DN4PDN117) Injection angle 4°
Needle valve dia.
ø 0.0866 in(
2.2 mm)
Nozzle type Throttle type
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