CAV Fuel Injection: Adjustments: Injectors

NOTE: Nozzle holders and nozzles should not be dismantled. If a nozzle is found to be faulty, replace complete unit.

To test nozzle with engine running, loosen fuel feed pipe union on each nozzle in turn.
If injector being tested has been operating properly, there will be a distinct reduction in engine speed accompanied by obvious roughness, but a faulty injector will make less reduction to engine speed.
If a faulty injector is found, replace it by disconnecting spill pipe at "T" connector and loosen banjo bolts at nozzles. Feed pipes must be removed from injector and pump.
CAUTION: Pipes must not be bent to clear unions on injectors.
Remove flange securing nuts.
Lift out injectors complete with spill pipe and copper washers.
Remove steel washers from inside injector holes.
To reinstall, attach spill pipe to new injectors, make sure connections are absolutely clean and free of foreign matter. Do not fully tighten banjo bolts at this stage.
Reassemble injectors and spill pipe to cylinder head, making sure new copper and steel washers are used.
NOTE: Steel washer must be fitted with "u" of corrugation facing downwards.
Replace flange securing nuts.

Tighten each nut alternately an equal amount to ensure that injector goes into position evenly. Tighten nuts to 6-8 ft. lbs. (.8-1.0 mkg), do not over tighten as nozzle distortion may result, causing rough and uneven running. Finally tighten spill pipe banjo bolts.

Injector Specifications

Injector		CAV Pintaux
Nozzle Size		BDNO/SPC6209
Operating Pressure of Nozzle Valve		1985 psi
Back Leakage Rate at 1470-2205 psi
	Original Nozzle	5 sec.
	New Nozzle	7 sec.

CAUTION: If a test stand is used to check injectors, hands must be prevented from coming into contact with fuel spray because working pressure is sufficient to cause fuel to penetrate the skin with ease.