Toro Groundsmaster 455-D Service Manual page 37

Fuel Injectors
Problem
Bad spray pattern
Leaking injector
Needle seized or showing seizing
marks
Leakage collector fills too quickly
Blue needle point
End of injector body corroded
(1) In these cases, replace the injector
Groundsmaster 455-D
Possible Cause
Carbon deposit around the orifice
Scored nozzle seat
Needle damaged
Foreign matter jammed between
nozzle seat and needle
Nozzle seat out-of-true
Water in fuel
Copper gasket not replaced
Injector nut too tight on injector
body
Leak between upper bearing face
of nozzle and bearing face of
injector body:
Foreign matter between
bearing faces
Unevenness
Incorrect injection pump timing
Running temperature of engine
too low
Intermittent operation
Page 3 - 19 Rev. B
Correction
Clean
Replace injector
Replace injector
Clean
Replace injector
Drain water and flush fuel feed
system (1)
Replace gasket at each repair
Tighten injector nut (1)
Clean
Replace injector
Replace injector and adjust pump
timing again
Check thermostat
Run machine longer. Do not start
and stop engine.
Engine