Opening Pressure Test - TM-5-3895-349-14-P0426

FUEL SYSTEM

TESTING AND ADJUSTMENT

WARNING: When testing a fuel injection nozzle,

TESTING 9L7883 FUEL INJECTION NOZZLES

keep the tip of the nozzle pointed away from the

operator and into the 8S2270 Fuel Collector.

Tools Needed:

8S2242 Nozzle Testing Group.

Fuel from the orifices in the tip of the nozzle is under high

8S2245 Injector Cleaning Tool Group.

pressure and can cause injury to the operator.

9S7354 Torque Wrench.

9S3093 Adapter.

8H8505 Combination Wrench.

Put the fuel injection nozzle (4) to the 8S2267 Nozzle

8H8502 Combination Wrench.

Tester (1) using the 8S2268 Tube Assembly (2) and the

8S2274 Socket.

9S3093 Adapter (3). The nut on the fuel injection nozzle

8S1589 Socket.

can be tightened by hand if the 1H1023 Seal does not have

Screwdriver.

damage.

An easy check can be made to find the cylinder that is

CAUTION: Be sure to use clean Kent-Moore J23300-585 or

misfiring, or running rough, and causing black smoke to

Shell 66631 calibration oil or equivalent when testing. Dirty

come out of the exhaust pipe.

test oil will damage components of the fuel injection

nozzle.

Run the engine at the speed that gives misfiring.

Loosen the fuel line nut at a fuel injection pump. This will

stop the flow of fuel to that cylinder. Do this for each

NOTE: Kent-Moore J23300-585 calibration oil can be

cylinder until a loosened fuel line is found that makes no

purchased from Kent-Moore Corporation 1501 South

difference in engine running. Be sure to tighten each fuel

Jackson Street, Jackson, Michigan 49203. Shell 66631

line nut after the test before the next fuel line nut is

calibration oil can be purchased from Shell Oil Company.

loosened. Check each cylinder by this method. When a

cylinder is found where the loosened fuel line nut does not

make a difference in engine running, test the injection

pump and injection nozzle for that cylinder.

Temperature of an exhaust manifold port, when the

engine is running at low idle speed, can be an indication of

the condition of a fuel injection nozzle. Low temperature at

an exhaust manifold port, is an indication of no fuel to the

cylinder. This can possibly be an indication of a nozzle

with a defect. Extra high temperature at an exhaust

manifold port, can be an indication of too much fuel to the

cylinder, caused by a nozzle with a defect.

CONNECTING NOZZLE TO TESTER

CAUTION: Do not test or disassemble nozzles unless you

1. 8S2267 Nozzle Tester. 2. 8S2268 Tube

have the correct service tools.

Assembly. 3. 9S3093 Adapter. 4. Fuel injection

Before testing a fuel injection nozzle, remove any loose

nozzle.

carbon from the tip of the nozzle with the 8S2258 Brass

Wire Brush. Remove the carbon seal dam. Clean the

Opening Pressure Test

groove for the carbon seal dam and the body of the nozzle

below the groove with the 8S2258 Brass Wire Brush. A

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

change in color in the area below the groove is normal and

valve. Open the pump isolator valve. Flush the fuel

does not effect the body of the nozzle. Remove the

injection nozzle by operating the nozzle tester for 10 to

carbon, but do not use the 8S2258 Brass Wire Brush to

15 strokes at a rate of 60 strokes per minute.

cause damage to the body of the nozzle. Do all tests

before cleaning or making any adjustments to a nozzle. A

2. Open the gauge protector valve. Make a slow increase

test can show that the nozzle must not be used again.

to the pressure until the valve in the