How are injector nozzles opened?
How are injector nozzles opened?
The electric solenoid attached to the injector nozzle is computer controlled and opens to allow fuel to flow into the injector pressure chamber. The high fuel pressure in the pressure chamber forces the needle valve upward, compressing the needle valve return spring and forcing the needle valve open.
Which way should the air bleed hole be facing on an installed fuel injector nozzle?
When dealing with Lycoming nozzles be sure to position the flat of the wrenching hex with the letter “A” facing down. This positioning places the air-bleed hole upward and prevents any residual fuel from dripping out after engine shutdown.
What are the requirements of fuel injector nozzles?
All nozzles must produce a fuel spray that meets the requirements of the performance and emissions goals of the market for which the engine is produced regardless of details of the fuel system design (i.e., regardless if the fuel system is of the common rail, unit injector, unit pump or pump-line-nozzle type).
What is the purpose of the air bleed in an injector nozzle?
Air will be drawn through the air bleed system when the engine is running so protect the system from picking up dirt. Naturally aspirated engines can also vent turbo nozzles by running individual 3/16″ hoses from each nozzle.
What is the air bleed connected to on the fuel injector for a turbocharged engine?
Normally-aspirated engines have air bleed screens on the outside of the nozzle, while turbocharged planes have a sealed connection that vents the nozzle air chamber to the turbocharged “top deck pressure” (turbocharger compressor outlet pressure).
What are the steps to install a spider injector?
Install the upper intake manifold mounting bolts and studs in the same locations as prior to removal. Tighten the bolts and studs in a crisscross pattern in 2 steps first to 45 inch lbs. (5 Nm) then to 83 inch lbs. (10 Nm).
How do you install a fuel meter injector?
Install the fuel injector into the fuel meter body injector socket. Install the lower hold-down plate and nuts. Tighten the nuts to 27 inch lbs. (3 Nm). Install the fuel meter body assembly into the intake manifold and tighten the fuel meter bracket retainer bolts to 88 inch. lbs. (10 Nm).
How do you replace fuel injectors in a car?
When replacing the fuel injectors, be sure to replace it with the correct injector. Disassemble the lower hold-down plate and nuts. While pulling the poppet nozzle tube downward, push with a small prytool down between the injector terminals and remove the injectors. Lubricate the new injector O-ring seats with engine oil.
How do you clean and replace fuel nozzles?
Complete the following steps, in the order given, to remove, clean, and replace the fuel nozzles. Cleaning Instructions Step 1. Examine the nozzle lines for damage or wear. If the nozzle lines are worn or damaged, replace the lines by unscrewing the lines from the flow divider. Step 2.
Install the fuel injector into the fuel meter body injector socket. Install the lower hold-down plate and nuts. Tighten the nuts to 27 inch lbs. (3 Nm). Install the fuel meter body assembly into the intake manifold and tighten the fuel meter bracket retainer bolts to 88 inch. lbs. (10 Nm).
How do you install a spider fuel injector?
While pulling the poppet nozzle tube downward, push with a small prytool down between the injector terminals and remove the injectors. Lubricate the new injector O-ring seats with engine oil. Install the O-rings on the injector. Install the fuel injector into the fuel meter body injector socket. Install the lower hold-down plate and nuts.
How to reassemble Lycoming engine nozzles horizontally?
Reassemble the nozzles as follows: LW18265 : In normally aspirated engines where the nozzles, P/N LW 18265 (see Figure 2), are installed horizontally, particular attention must be paid to the identificatio n marks stamped on one of the hex flats on the nozzle body.
