Return Leakage Test - TM-5-3895-349-14-P0424

FUEL SYSTEM

TESTING AND ADJUSTMENT

More than 10 drops in 15 seconds is an indication of

parts with too much wear or bad parts, and

replacement of the fuel injection nozzle is necessary.

Tightening Locknuts and Cap

1. Remove the fuel injection nozzle (5) from the 8S2267

Nozzle Tester (2) and put it in the 8S2250 Nozzle

Holding Tool (11).

2. Tighten the locknut (6) holding the pressure adjustment

screw (7) to 70 to 80 lb. in. (80.7 to 92.2 cm. kg).

TIGHTENING PRESSURE SCREW LOCKNUT

(Typical Example)

3. Tighten the locknut (9) holding the lift adjustment screw

(10) to 35 to 45 lb. in. (40.4 to 51.9 cm. kg).

ANALYSIS OF NOZZLE SPRAY PATTERN

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 ANALYSIS OF

NOZZLE SPRAY PATTERN.

Return Leakage Test

1. Put the tip of the fuel injection nozzle a little above the

horizontal position. Tighten the nuts that connect the

fuel injection nozzle to 'the tester.

TIGHTENING VALVE LIFT SCREW LOCKNUT

(Typical Example)

2. Operate the tester until the pressure is at 1400 to 1600

psi (98.4 to 112.5 kg/cm2).

4. Install a new O-ring seal (8). Install cap (1) and tighten

to 110 to 120 Ib. in. (126.8 to 138.4 cm. kg).

3. Look at the leakage from the return at the top (pressure

screw end) of the fuel injection nozzle. After the first

two drops fall, leakage is 1 to 10 drops in 15S seconds

with SAE J967b oil or Kent-Moore J23300-585 or Shell

NOTE: Be sure to install a new O-ring seal (8) before

66631 calibration oil, with the temperature of the

installing the cap.

calibration oil at 65to 75 (18to 24 ).