Cleaning Tool Group
SAE J-967 Calibration
(1) Connection for the nut (not shown) of the fuel supply line
(2) Threaded hole for the banjo bolt of the fuel return line
(3) Nut of the fuel injector nozzle
(4) Wire clip
(5) Seat washer
Fuel injector nozzles and lines.
(1) Nut for the fuel supply line
(2) Banjo bolt
(6) Fuel supply line
(7) Fuel return line
Run the engine at low idle.
Loosen the nut for the fuel supply line (1) at each fuel
injector nozzle. Listen for the low idle to decrease or
become rough at each cylinder.
The fuel injector nozzle is defective when the fuel supply
line (1) is loosened and the following events occur:
The engine rpm does not decrease.
The engine does not idle roughly.
Remove the fuel injector nozzle for additional testing.
If leakage occurs at the nut for the fuel supply line
(1), make sure that the fuel supply line (6) and the
nut for the fuel supply line (1) are correctly
aligned with the inlet connection of the fuel
injector nozzle (1). Do not tighten the nut for the
fuel supply line (1) on the high pressure fuel line
more than the recommended torque. If the nut is
tightened more, the fuel line may become
restricted or the threads of the fuel injector nozzle
and the nut may be damaged.
Cleaning Of Fuel Injector Nozzles
Before a fuel injector nozzle is tested, remove any loose
carbon from the tip of the fuel injector nozzle. Do not use
abrasive material or a wire brush in order to clean the nozzle.
Disassembling or adjusting the nozzle will violate the standards