How to adjust the height of the fuel injector?
How to adjust the height of the fuel injector?
Adjust the fuel injector height for the engine models in parentheses by placing the small end of the height gage in the hole provided in the fuel injector body, with the flat of the gage toward the fuel injector plunger.
What are the symptoms of a leaking fuel injector?
Symptoms of leaking fuel injectors: 1 Hard Starting when engine is hot. 2 Increased Fuel Consumption. 3 Rough Idle. 4 Fuel odors inside and around the car. 5 Poor Emissions. 6 (more items)
Where is the fuel injector located in the fuel rail?
At the top O-ring where the fuel injector is located in the fuel rail. (Repairable – replace O-ring) The fuel Injector pintle, ball or disc seat due to damage or corrosion (Not repairable, Discard Injector) The fuel injector body at the top of the fuel injector. (Not repairable – Discard fuel Injector) Test leaking Fuel Injectors.
Can a fuel injector be tested under pressure?
Fuel injector leak testing should be done under operating pressure. The average DIY fuel injector cleaning project and most automotive repair shops does not have the proper diagnostic equipment or the ability to test leaking injectors or clean them properly.
How do you know when to replace a fuel injector?
Another effective test is to measure the pressure loss in the fuel rail when each injector is fired and pulses for a set period of time. Use an electronic injector pulse tester for this. As each injector is energized, a fuel pressure gauge is observed to monitor the drop in fuel pressure.
What causes a fuel injector to stop delivering fuel?
An injector becomes clogged with fuel varnish deposits and fails to deliver its normal dose of fuel when it’s energized, or. Fuel pressure to the injector drops below specifications because of a weak fuel pump, plugged fuel filter or leaky fuel pressure regulator.
Where is the fuel injector located in a six cylinder engine?
The same applies to the injectors in the middle cylinders in six- and eight-cylinder engines. The hotter the location, the more vulnerable the injector is to clogging from heat soaks. Throttle body injectors are less vulnerable to heat soak because of their location high above the intake manifold plenum.
Why are fuel injectors more sensitive to fuel condition?
On older multiport systems that fire the injectors simultaneously, the computer compensates by increasing the “on” time of all the injectors, which can create an overly rich fuel condition in the other cylinders. Direct fuel injectors are more sensitive to restrictions because of the precise amount of fuel they inject into the combustion chamber.
How is the torque of a fuel injector measured?
The dimension is measured from the top of the unit injector to the machined ledge of the fuel injector body. Turn unit injector adjusting screw (2) clockwise until the correct height is obtained. Hold the adjusting screw in this position and tighten locknut (3) to a torque of 100 ± 10 N·m (74 ± 7 lb ft).
How tall should the valve lash and injector be?
To ensure efficient engine performance and extended valve and injector service life, an initial valve lash and injector height measurement/adjustment requirement has been established.
How to adjust the torque of a caterpillar injector?
Turn unit injector adjusting screw (2) clockwise until the correct height is obtained. Hold the adjusting screw in this position and tighten locknut (3) to a torque of 100 ± 10 N·m (74 ± 7 lb ft). To make an adjustment to the unit injectors on cylinders 1, 2, and 4, remove the timing bolt.
How to adjust the valves and set the fuel injector Heights?
When setting valve lash clearance or injector height, always set them to the dimension listed in Table 12-2. Adjust the valves and set the fuel injector heights as follows: 1. Disconnect starting power for engine. 2. Remove the engine valve rocker cover as outlined.
How to measure valve lash and injector height?
Note: On engines equipped with a Jake Brake, measure valve lash and injector height before removing any brake housings. Only remove the brake housings necessary to provide access for adjustment. 1. Exhaust Valve 6. Intake Valve 2. Intake Valve 7. Fuel Injector Follower 3. Locknut 8. Valve Button 4. Adjusting Set Screw 9. Exhaust Valve 5.
What happens if you fail to measure injector height?
Failure to measure valve clearances and injector heights at the required initial period and make necessary adjustments may result in gradual degrading of engine performance and reduced fuel combustion efficiency. Table 2. Measurement/Adjustment Period
Where is the injector height Gage on a jake brake engine?
On engines equipped with a Jake Brake®, move the handle on the injector height gage to the alternate position, 90° to the shank. A height gage pilot hole is provided in the injector body on the machined surface contacted by the injector clamp near the solenoid. See Figure “Timing Gage” . Table 3. Valve Clearance and Injector Height Settings
How is the plunger in a Detroit Diesel unit injector?
The plunger and bushing within the unit injector can be likened to the pumping element in an in-line, port-helix metering pump. The bushing is stationary and machined with upper and lower ports, 180° offset. The plunger reciprocates within the bushing.
What was the problem with the Detroit Diesel 8.2 liter?
Unfortunately, due to its misguided design and light build, the 8.2 proved to be quite troublesome especially in marine service as it was plagued by “blown” head gaskets, broken crankshafts and spun bearings. which were common failures experienced by dieselized gasoline engines.
What’s the charging pressure on a Detroit Diesel?
Each unit injector has fuel delivered to it at charging pressure, variable between 30-70 psi. (200 KPa – 470 KPa) dependant on engine speed. Charging pressure is generated by a positive displacement, gear pump, driven by the Roots blower drive shaft, and responsible for all movement of fuel through the fuel subsystem.
How do you change the fuel injector on a Detroit car?
After replacing failed injectors they will need to be set to the correct calibration. Insert the 3/4-inch breaker bar into the square drive hole at the center of the engine crankshaft pulley. A 3/4-inch ratchet may be substituted for the breaker bar.
Where is the height Gage on a Detroit EGR engine?
On engines equipped with a Jake Brake®, move the handle on the injector height gage to the alternate position, 90 degrees to the shank. A height gage locating hole is provided in the injector body on the machined surface contacted by the injector clamp near the solenoid.
