Injection Pump Test - Toro Groundsmaster 300 Series Service Manual

Injection Pump Test

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.
It is possible to determine if the fuel injection pump
requires 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
pump. (See Fuel Pump Test in this section and Bleeding
Air From the Fuel System in the Fuel System Repairs
section of this section.)
2. Check the operating condition of the injection nozzles
to make sure that the injection pressure is correct. (See
Injection Pressure Test in this section of the book.)
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.
B. Remove the nozzle from the cylinder head.
C. Connect the fuel delivery pipe to the nozzle as-
sembly so the tip of the nozzle is pointed away from
the engine. Tighten the fitting securely.
Testing
D. Put the throttle control in the FAST position. Turn
the ignition key to the START position to crank the
engine. Observe the nozzle.
The injection 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 injected into the skin get proper
medical attention from a doctor immediately.
A serious infection or other reaction can de-
velop 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.
If the nozzle produces an atomized mist of fuel the
injector pump for that cylinder is operating properly.
Failure of the nozzle to inject fuel can indicate a injection
pump cylinder that is not operating correctly.
5. Repeat the test for the other cylinders.
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Groundsmaster 300 Series