NOZZLE ASSEMBLY TROUBLE SHOOTING GUIDE

FUEL SYSTEM

TESTING AND ADJUSTMENT

for leakage between the cap and the body of the fuel

injection nozzle.

1. Put the fuel injection nozzle (5) on the 8S2267

Nozzle Tester (2).

2. Get the pressure to approximately 4000 psi (281.2

kg/cm2). Do this by pumping the tester until the

cap is completely full of fuel, and then continue to

pump until the pressure is 4000 psi (281.2 kg/cm2).

There must not be any leakage between the cap

and the body of the fuel injection nozzle. If there is

TIGHTENING CAP

leakage, make replacement of the O-ring seal (8)

16. 9S5031 Socket.

and check for cracks in the cap. Check nozzle

Cap Leakage Test

again. If there is still leakage, make replacement

With the adjustments and tests complete, check

of the fuel injection nozzle.

NOZZLE ASSEMBLY TROUBLE SHOOTING GUIDE

PROBLEM

CAUSE

CORRECTION

Opening Pressure Not Correct

1. Adjustment wrong.

1. Make adjustment

2. Bad Parts

2. Make replacement of nozzle

assembly

1. Clean orifices

Nozzle Will Not Open

1. Orifices not open

2. Make replacement of nozzle

2. Bent valve

assembly

3. Make adjustment

3. Adjustment of lift not correct

Spray Pattern Not Correct

1. Orifices not open or bad

1. Clean orifices, if orifices are bad,

make replacement of nozzle

assembly

2. Crack at tip of nozzle

2. Make replacement of nozzle

assembly

3. Adjustment of lift screw not correct

3. Make adjustment

Leakage At The Seat

1. Deposits in seat area

1. Disassemble and clean nozzle

2. Seat for valve bad

2. Make replacement of nozzle

assembly

3. Distortion of body

3. Make replacement of nozzle

assembly

4. Crack at tip of nozzle

4. Make replacement of nozzle

assembly

Return Leakage High

1. Wear or scratches at guide

1. Make replacement of nozzle

assembly

2. Bad parts

2. Make replacement of nozzle

assembly

Return Leakage Low

1. Varnish on valve

1. Clean guide area with solvent

2. Not enough clearance

2. Make replacement of nozzle

assembly