Service Manual

ManualsBrandsToro ManualsRiding ProductsGroundsmaster 455-D 4-Wheel Drive

Injection Pump Testing

Calibration of fuel delivery volumes, pressure and dis-

tribution between pump barrels should be performed by

a professional diesel engine service shop. Special test

fixtures and equipment are required.

D. Put the throttle control in the FAST position. Turn

the ignition key to the START position to crank the

engine. Observe the nozzle.

It is possible to determine if the fuel injection pump

equires service through a process of elimination using

other fuel system tests. The following test procedure will

help isolate fuel system difficulties.

1. Make sure that fuel is being supplied to the injector

pum

2. Check the operating condition of the injection nozzles

to make sure that the injection pressure is correct.

3. Make sure that the injection pump is providing suffi-

cient fuel pressure to operate the nozzle by performing

the following procedures:

A. Loosen the fuel delivery pipe from the number one

nozzle.

f the nozzle produces an atomized mist of fuel the

The in ection pump forces fuel from the noz-

zle under extremely high pressure. Always

point the nozzle tip away from yourself and

any other personnel. Contact with the fuel

stream, even though it appears to be a mist

can cause fuel to penetrate clothing and skin.

If fuel is in ected into the skin get proper

medical attention from a doctor immediately.

serious infection or other reaction can

develop if the in ury is not properly treated.

Tighten all adapter fittings to prevent leaks. If

a leak is suspected, use a piece of cardboard,

not your hands to search for a leak.

CAUTION

B. Remove the nozzle from the cylinder head.

injector pump for that cylinder is operating properly.

Failure of the nozzle to inject fuel can indicate a injection

C. Connect the fuel delivery pipe to the nozzle as-

pum

p cylinder that is not operating correctly.

sembly so the tip of the nozzle is pointed away from

the engine. Tighten the fitting securely.

5. Repeat the test for the other cylinders.

Engine

Groundsmaster 455-D Page 3 - 31

Rev. B

Engine