Valve Lift Adjustment - TM-5-3895-349-14-P0428

FUEL SYSTEM

TESTING AND ADJUSTMENT

3. Turn the lift adjustment screw (6) counterclockwise 3/4

1/8 of a turn.

4. Hold the lift adjustment screw (6) with a screwdriver and

tighten locknut (5) just enough so that the lift adjustment

screw (6) will not turn.

5. Put the fuel injection nozzle in the 882250 Nozzle

Holding Tool. Put the 8S2250 Nozzle Holding Tool in a

vise and tighten locknut (5) to 356 to 40 lb. in. (40.4 to

46.1 cm. kg).

TIGHTENING PRESSURE SCREW

Remove the fuel injection nozzle from the 882250

Nozzle Holding Tool. Connect the fuel injection

nozzle, to the 8S2267 Nozzle Tester. Make sure

the tip of the fuel injection nozzle is in the down

position. Point the tip of the fuel injection nozzle

into the 862270 Fuel Collector. Check the opening

pressure. If the opening pressure is not correct, do

TIGHTENING LOCKNUT

the complete procedure in Step 3 again.

Checking Seat Condition

Valve Lift Adjustment

1. Put a shop towel around the top of the body of the fuel

injection nozzle (pressure screw end) to take in the

1. With the opening pressure correct and while pumping

leakage. Close the gauge protector valve.

test oil through the fuel injection nozzle, hold the

2. Point the tip of the fuel injection nozzle into the 8S2270

locknut (5) and slowly turn the lift adjustment screw (6)

Fuel Collector and operate the pump rapidly for a

clockwise until no fuel comes from the fuel injection

minimum of five strokes to put the valve on the seat.

nozzle.

Open the gauge protector valve. Be sure the nozzle tip

is completely dry.

2. Check to be sure the valve is on the seat by making

the pressure 200 to 500 psi (14.06 to 83.15 kg/cm )

3. Make the pressure 250 to 800 psi (17.6 to 21.1 kg/cm )

more than the opening pressure.

less than the opening pressure. If more than 3 drops of

fuel get on the tip of the fuel injection nozzle in 15

CAUTION: Do not bend the valve or damage the seat by

seconds, clean or make replacement to the fuel

turning the lift adjustment screw (6) with too much force.

injection nozzle.

NOTE: Some fuel can be at the tip of the fuel injection

Spray Characteristic (Pattern)

nozzle but a rapid flow of drops (dribble) must not be seen.

NOTE: The adjustment for the valve lift must be correct

before checking the spray pattern.

1. Close the gauge protector valve and the on-off valve.

Open the pump isolator valve.

2. Point the tip of the fuel injection nozzle into the 8S2270

Fuel Collector.

3. Make a slow increase in pressure and look at the spray

pattern when fluid begins to flow through the fuel

injection nozzle. The spray must be the same through

all four orifices.

Any change, either vertically or

horizontally, is an indication of a bad nozzle. See the

TIGHTENING LOCKNUT

ANALYSIS OF NOZZLE SPRAY PATTERN.