To make an adjustment to the opening pressure, use the following procedure:

FUEL SYSTEM

TESTING AND ADJUSTMENT

b. Hold the lift adjustment screw (10) with a 5/64" hex

fuel injection nozzle opens. It is possible for the

wrench (13) and remove the locknut (9).

reading of the pressure on the gauge to go down

fast if the valve makes a noise (chatters) when it

opens. It is also possible for the reading of the

pressure on the gauge to be almost constant when

the valve in the fuel injection nozzle opens. The

pressure needed to open the valve must be the

same as shown in the chart. If the opening

pressure is less than 2200 psi (154.7 kg/cm2 ),

do not use the fuel injection nozzle again.

NOTE: The valve in the fuel injection nozzle can be good

and still not make a noise (chatter), or not have a very fine

vapor (spray) from the orifices in the tip of the fuel injection

nozzle during Step 2.

REMOVING LOCKNUT

OPENING PRESSURE

9. Locknut (for lift adjustment screw). 13. 5/64"

VALVE NO.

hex wrench.

Used

New

9L6969

2400 to 2900 psi

2750 to 2900 psi

(168.7 to 203.9 kg/cm2)

(193.3 to 203.9 kg/crn2)

NOTE: The correct setting of the opening pressure for used

c. Loosen the locknut (6) that holds the pressure

nozzles that have been cleaned is 2700 to 2900 psi (189.8

adjustment screw (7).

to 203.9 kg/cm2).

3. To make an adjustment to the opening pressure, use

the following procedure:

a. Remove the fuel injection nozzle (5) from the

8S2267 Nozzle Tester and put it in the 8S2250

Nozzle Holding Tool (11). Loosen locknut (9)

holding the lift adjustment screw. Turn the lift

adjustment screw (10) counterclockwise one turn.

LOOSENING LOCKNUT

5. Fuel injection nozzle. 14. 8H8505

Combination Wrench.

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

Nozzle Tester (2). Turn the pressure adjustment screw (7)

clockwise using a spanner-type screwdriver (15). Each

LOOSENING LOCKNUT

one-fourth of a turn will increase the opening pressure

9. Fuel injection nozzle. 11. 8S2250 Nozzle

approximately 250 psi (17.8 kg/cm ). Do not turn more

Holding Tool. 12. 8H8502 Combination Wrench.

than one-half of a turn to increase the opening pressure.

CAUTION: If the lift adjustment screw is not turned

counterclockwise one turn, the valve can be bent or the

e. Hold the pressure adjustment screw (7) and tighten

seat for the valve can be damaged when the pressure

locknut (6) just enough so that the pressure adjustment

adjustment screw is turned.

screw (7) will not turn.