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1 Page 1 of 12 Section 2.3 N2 Electronic Unit Injector The N2 Electronic Unit Injector (EUI) is a lightweight, compact unit that injects diesel fuel directly into the combustion chamber. See Figure "N2 Electronic Unit Injector Cross-section". 1. Spray Tip 11. Injector Body 2. Spring Cage 12. Plunger 3. Check Valve Cage 13. Upper O-ring Grooves and Seals 4. Spacer 14. Fuel Outlet Openings 5. Fuel Inlet Opening 15. Injector Nut 6. Fuel Supply Chamber 16. Lower O-rings Grooves and Seals 7. Poppet Control Valve 17. Flat Disk Check Valve 8. Solenoid 18. Injector Needle Valve Spring 9. Injector Follower 19. Needle Valve 10. Injector Follower Spring Figure 1. N2 Electronic Unit Injector Cross-section The amount of fuel injected and the beginning of injection timing is determined by the ECM. The ECM sends a command pulse which activates the injector solenoid. The EUI performs four functions: Creates the high-fuel pressure required for efficient injection. Meters and injects the exact amount of fuel required to handle the load. Atomizes the fuel for mixing with the air in the combustion chamber. Permits continuous fuel flow for component cooling. Engine combustion is obtained by injecting, under pressure, a small quantity of accurately metered and finely atomized fuel oil into the cylinder. Metering and timing of the fuel is accomplished by the ECM which actuates the solenoid poppet valve to stop the free flow of fuel through the injector. When the solenoid poppet valve closes, fuel is trapped in the injector body and under the plunger. The continuous fuel flow through the injector prevents air pockets in the fuel system and cools those injector parts subjected to high combustion temperatures.
2 Page 2 of 12 Note: Do not test new or reliabilt remanufactured electronic unit injectors prior to installation in the engine. The Kent-Moore POP stand should only be used as a diagnostic tool on fuel injectors that have been removed from an engine. Fuel enters the injector through the two fuel inlet filter screens located around the injector body. See Figure "Fuel Injector Body". Filter screens are used at the fuel inlet openings to prevent relatively coarse foreign material from entering the injector. Figure 2. Fuel Injector Body Note: Effective with September, 1988 production, Series 60 engine EUI nuts incorporate one upper seal ring groove and seal ring, instead of two. See Figure "N2 Electronic Unit Injector". Outlet openings, through which the excess fuel oil returns to the fuel return manifold and then back to the fuel tank, are located around the injector nut. See Figure "N2 Electronic Unit Injector". Figure 3. N2 Electronic Unit Injector After entering the nut cavity, the fuel passes through a drilled passage into the poppet control valve and
3 Page 3 of 12 plunger area. See Figure "N2 Electronic Unit Injector Cross-section". The plunger operates up and down in the body bore of the injector. The motion of the injector rocker arm is transmitted to the plunger and follower that bears against the follower spring. As the piston moves approximately two-thirds of the way up in the cylinder on the compression stroke, the injector cam lobe begins to lift causing the injector rocker arm to push down on the follower and the plunger. Just before injection begins, the ECM sends an electronic pulse which turns on the injector solenoid. The energized solenoid creates a magnetic force which pulls the armature up, closing the poppet valve and trapping fuel under the plunger and passages leading down to the needle valve. The fuel pressure increases as the plunger continues its downward stroke. A flat disk check valve is built into the injector fuel passages between the plunger and the tip. This check valve normally has no effect on the injection process but will function to prevent cylinder gases from blowing back into the injector and fuel system if a particle of debris should become lodged between the needle and seat or the tip assembly fails. This fuel pressure acts on the needle valve. When it creates a force high enough to overcome the valve spring force holding the needle on its seat, the needle valve moves up, allowing the high pressure fuel to spray into the combustion chamber. The high pressure of the fuel passing through the small holes in the tip creates a finely atomized spray for combustion within the cylinder. After the pulse width time has passed, the ECM turns off the current to the injector solenoid. The deenergized solenoid allows a spring to open the poppet valve, permitting the trapped fuel to spill down, dropping the pressure within the injector. When the pressure is low enough the needle valve closes and ends injection. The beginning of injection and metering of the fuel in relation to the crankshaft position are controlled by the ECM. Injection begins soon after the poppet valve is closed. The valve closing point information, known as the response time feedback, is returned to the ECM. This information is used to monitor and adjust injection timing, thus removing injector-to-injector variation influences on timing. The amount of fuel injected depends on the pulse width stored in the calibration which determines how long the poppet valve remains closed; the larger the pulse width the longer the valve is closed and the more fuel is injected. When the injector rocker arm has completed its downward travel the injector follower spring returns it to the starting position. As the plunger moves up fuel enters the injector pumping cavity for another injection cycle. The constant circulation of fuel through the injector renews the fuel supply in the chamber and aids the cooling of the injector. Section Repair or Replacement of N2 Electronic Unit Injector To determine if repair is possible or replacement is necessary perform the following procedure. See Figure "Flowchart for Repair or Replacement of N2 Electronic Unit Injector".
4 Page 4 of 12 Figure 4. Flowchart for Repair or Replacement of N2 Electronic Unit Injector Section Removal of N2 Electronic Unit Injector The following steps must be performed prior to removing an injector: Note: The solenoid can be replaced without removing the injector. Refer to "2.3.4 Repair of N2 Electronic Unit Injector Solenoid and Seals". 1. Clean the valve rocker cover around its seat on the head, and in the attaching bolt recesses. a. To remove the one-piece rocker cover, refer to "1.6.2 Removal and Cleaning of One-piece Rocker Cover For Diesel Engines Only". b. To remove the two-piece rocker cover, refer to "1.6.3 Removal and Cleaning of Two-piece Rocker Cover For Diesel Engines Only". c. To remove the three-piece rocker cover, refer to "1.6.5 Removal and Cleaning of Three-piece Rocker Cover". EYE INJURY (cit24) To avoid injury from flying debris when using compressed air, wear adequate eye protection (face shield or safety goggles) and do not exceed 276 kpa (40 psi) air pressure. All the fuel must be removed from the cylinder head before removing an injector to prevent the fuel from entering the cylinder and causing hydrostatic lock or washdown. If the head is not thoroughly purged of fuel before an injector is removed, fuel remaining in the fuel manifold will drain into the cylinder filling the piston dome recess. It cannot drain from the dome and, if not removed, can cause hydrostatic lock and bend the connecting rod.
5 Page 5 of Drain the cylinder head fuel gallery by removing the inlet and outlet lines from the fittings at the rear of the cylinder head. Blow low pressure compressed air into the inlet fitting for 20 to 30 seconds or until all of the fuel is purged from the cylinder head. See Figure "Cylinder Head Fuel Fitting Locations". Note: Front and rear rocker shaft assemblies look identical but are not interchangeable because of different bolt hole center distances. The outboard end of each rocker shaft assembly is marked with the DDC logo for identification. Care should be taken to identify and return assemblies to the proper location if both overhead assemblies are removed. Note: Loosening the fuel line at the inlet fitting will allow fuel to flow faster. Carefully collect the drained fuel in an appropriate container. Figure 5. Cylinder Head Fuel Fitting Locations 3. Remove the two rocker shaft through-bolts and one nut for each rocker shaft assembly, and lift the rocker shaft assembly off the engine. Refer to "1.3.2 Removal of Rocker Arm Assembly". To remove the injector, complete the following steps: Do not remove the screws from the injector. The wire terminals have keyhole slots to fit over the screw head. Turning the screws too far will damage the threads in the injector solenoid housing. 1. Loosen the injector wire terminal screws two full turns and remove the terminal wires. 2. Remove injector hold down clamp. Extreme care should be used when handling an EUI to avoid costly damage by dropping or otherwise mishandling the EUI.
6 Page 6 of 12 Note: When replacing an EUI, always replace the injector O-rings. 3. Lift the injector from its seat in the cylinder head by inserting a pry bar under the injector body. See Figure "Removing N2 Electronic Unit Injector". Figure 6. Removing N2 Electronic Unit Injector Avoid wire brushing the spray holes to prevent damage. 4. Cover the injector hole in the cylinder head to keep out foreign material. Remove carbon from the injector exterior in the area where the tip joins the nut, using wire buffing wheel (J 7944). Section Disassembly of Electronic Unit Injector On a Series 60 engine EUI, only the injector solenoid and seal rings are serviceable. The injector must not be disassembled. Section Inspection of the N2 Electronic Unit Injector To clean and inspect the injector, complete the following steps: Note: The injector can be tested either on or off of the engine. EYE INJURY (cit24) To avoid injury from flying debris when using compressed air, wear adequate eye protection (face shield or safety goggles) and do not exceed 276 kpa (40 psi) air pressure.
7 Page 7 of Clean the exterior of the injector with clean solvent and dry it with compressed air. Note: Do not test new or reliabilt remanufactured electronic unit injectors prior to installation in the engine. The Kent-Moore POP stand should only be used as a diagnostic tool on fuel injectors that have been removed from an engine. 2. Test the EUI using J A. Follow procedures supplied with this tool. Reuse or replace injector or injector and solenoid as indicated by testing. 3. Inspect the O-rings for damage or foreign material. Replace O-rings. 4. Inspect the fuel injector tubes at the injector seat. If required, replace the fuel injector tubes. Section Repair of N2 Electronic Unit Injector Solenoid and Seals Perform the following steps for solenoid replacement: 1. Loosen the injector wire terminal screws two turns and remove terminal wires. 2. Loosen four hex-head screws and remove old solenoid. See Figure "Electronic Unit Injector Solenoid Assembly". 1. Spacer Seals 4. Screw 2. Solenoid 5. Follower Retainer 3. Load Plate 6. Spacer Figure 7. Electronic Unit Injector Solenoid Assembly 3. Perform the appropriate step for the DDEC unit used. a. For DDEC I and DDEC II, discard the solenoid, load plate, follower retainer, and screws. Do not reuse old screws. b. For DDEC III/IV, discard the solenoid, follower retainer, and screws. Do not reuse old screws. The load plate must be reused.
8 Page 8 of Remove spacer and seals from injector body. 5. Discard seals, but do not discard spacer. 6. Install new seal in spacer groove and position spacer on body with seal facing down. See Figure "Electronic Unit Injector Solenoid Assembly". Seal may be retained in groove with small quantity of grease. 7. Install new seal in solenoid groove. 8. Install solenoid on spacer. The spacer is a matched component with the armature and must remain with its respective injector. The load plate on each DDEC III injector is unique and must remain with the injector. The DDEC III load plate carries the injector part number, the injector serial number in bar code format, and the injector calibration code number. 9. Install new screws through the load plate and follower retainer, solenoid, and spacer. 10. Thread screws into body and tighten all screws until heads contact retainer and load plate with a slight force (less than 0.6 N m [5.3 lb in.] torque) in the sequence shown. See Figure "N2 Electronic Unit Injector Solenoid Torque Sequence". Figure 8. N2 Electronic Unit Injector Solenoid Torque Sequence 11. Torque screws to 2 N m (17.7 lb in.) in the sequence shown. See Figure "N2 Electronic Unit Injector Solenoid Torque Sequence". 12. On DDEC II injectors only, etch the last four digits of injector part number on the load plate. See Figure "N2 Electronic Unit Injector Solenoid Torque Sequence". Section Installation of the N2 Electronic Unit Injector Perform the following steps: 1. If the fuel system is contaminated with coolant:
9 Page 9 of 12 a. Drain the fuel tanks and refill with clean fuel. Refer to " Fuel Tanks". b. Replace both filters with new, and clean the fuel/water separator, if equipped. Refer to " Fuel Filters (Diesel)". c. Inspect fuel injectors for damage and replace as required. 2. If the coolant system is contaminated with fuel, flush and reverse flush the system. Refer to " Cooling System". EYE INJURY (cit24) To avoid injury from flying debris when using compressed air, wear adequate eye protection (face shield or safety goggles) and do not exceed 276 kpa (40 psi) air pressure. Leftover fuel must be removed from the injector bore before injector installation. If fuel is trapped between the top of the injector hole tube and the lower injector O-ring seal, it may seep down to the injector hole tube seal ring, causing swelling and possible seal leakage. 3. Using clean compressed air, blow out any fuel remaining in the injector bore. Note: If the engine is equipped with an auxiliary injector tube seal, replace it with a new seal when the injector is removed. Do not use a metal dowel as this may damage the seal. Injector seals are considered one-use items and cannot be reused. Any time an injector is removed, all three injector nut O-ring seals must be replaced with new seals. Failure to replace seals can result in seal leakage. 4. Detroit Diesel encourages the use of an additional service seal ( ) that is impervious to both coolant and fuel. This seal should be used in situations where injector tube seal leakage or deterioration is suspected or confirmed. Place the auxiliary seal in the injector hole and seat it against the top of the injector tube with a 41.3 mm (1-5/8 in.) diameter wood or plastic dowel. 5. Check to make sure the injector bore is thoroughly clean. 6. Apply a thin coat of clean ethylene glycol to the injector seal rings and install them in the injector nut ring grooves. Make sure seals are properly seated. 7. Insert the injector into its respective injector tube bore. Visually align the injector body for equal clearance between valve springs (there is no locating dowel pin on the underside of the EUI). After locating the injector, press down on the top of the injector body with the heel of your hand to seat it in the injector tube. Note: The injector tube bore should be cleaned and inspected for damage before installation of the
10 Page 10 of 12 electronic unit injector. Refer to "2.4.4 Cleaning of N2 Injector Tube". The hemispherical portion of the hold-down clamp washers must be installed facing the clamp (pointing down) in order to prevent damage to the washers. See Figure "N2 Electronic Unit Injector and Related Parts". 1. Injector Hold-down clamp 5. Auxiliary Injector Seal 2. Electronic Unit Injector 6. Injector O-rings 3. Injector Tube O-ring 7. Hold-down Clamp Washer 4. Injector Tube 8. Hold-down Clamp Bolt Figure 9. N2 Electronic Unit Injector and Related Parts 8. Determine which type of hold-down clamp is used by measuring the overall height. a. If the overall height is 54 mm (2.125 in.), proceed to step 9. b. If the overall height is 52 mm (2.047 in.), skip to step Position a mm (0.030 in.) feeler gage between the clamp and injector spring on the side of the spring that faces the intake manifold. 10. Install the hold-down clamp, hemispherical clamp washer (flat surface up against bolt) and holddown bolt to the injector. See Figure "Hold-down Clamp Washer Installation". Ensure the clamp does not interfere with the injector spring or valve springs. 11. Torque the hold-down bolt to N m (43-49 lb ft).
11 Page 11 of 12 Figure 10. Hold-down Clamp Washer Installation 12. Install the EUI terminal wires by positioning the keyhole in the terminal over the screw in the injector solenoid housing. Pull the terminal end down so that the screw rests in the smaller slot in the terminal. Torque the terminal screws to N m ( lb in.). Do not bend the terminals down after installation. See Figure "N2 Electronic Unit Injector Terminal Installation". Figure 11. N2 Electronic Unit Injector Terminal Installation 13. Install the rocker arm shafts, with rocker arms in place. Refer to "1.3.3 Installation of Rocker Arm Shaft Assembly". Note: Front and rear rocker shaft assemblies look identical but are not interchangeable due to different bolt-hole center distances. The outboard end of each rocker shaft assembly is marked with the DDC logo for identification. Care should be taken to identify and return assemblies to the proper location if both overhead assemblies were removed. 14. Adjust the intake and exhaust valve clearances and injector height. Refer to "12.2 Valve Lash, Injector Height (Timing) and Jake Brake Lash Adjustments" 15. Install the inlet and outlet fuel lines to the fittings at the rear of the cylinder head. See Figure
12 Page 12 of 12 "Cylinder Head Fuel Fitting Locations". 16. On DDEC III/IV engines, record the injector calibration code from the load plate with the proper cylinder location. 17. Install the valve rocker cover. Refer to "1.6.7 Pre-installation of Rocker Cover". 18. For one-piece valve rocker cover, refer to "1.6.8 Installation of One-Piece Rocker Cover". For twopiece and three-piece valve rocker cover, refer to "1.6.9 Installation of Two-Piece and Three-Piece Rocker Covers". 19. Verify repair of electronic unit injector. Refer to "11.7 Engine Run-in Instructions". EPA04 Series 60 Workshop Manual (DDC-SVC-MAN-0004) Printed Wed Mar 28 17:46: Copyright 2012 by Detroit Diesel Corporation. All rights reserved. Generated on
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