Cummins PT fuel injection system attendant adjustment
(1) the preparation before adjustment
Diesel engines should reach operating temperature; oil temperature should reach 74 above; injector parts numbers should be correct; flow should be in line with requirements; injector valve in accordance with the regulations and adjust better to throttle linkage transferred to the control of the whole open position (when the throttle to relax, before encountered throttle adjustment screw). Then will be installed to speed table PT fuel pump driveshafts time connecting devices.
(2) The governor of adjustment methods:
to work in a diesel engine temperature. PTG spring from the governor components covered under Luosai screw fastening to raise Idle Idle adjustment screw, installed after idling for good Luosai.
The governor with the MVS PT fuel pump, the highest speed and idle adjustment screw in the governor back, it may be the rear of the idle speed screw fastening a locking nut first, then screw or screw a screw to obtain the necessary speed. For good immediately after fastening nut locked tight to prevent air mixing.
Factories are generally provided a diesel engine idle speed [United States Cummins diesel engine series, as recommended by the idle speed (600-20) r / min]. Within the specified scope of the changes to allow a reasonable, but not excessive. Otherwise, it will cause difficulties linked to stall (idle speed too high) or less to load, or even diesel engines to stop.
Governor confirmed plunger is idling the reasons for the instability before the inspection in accordance with the regulations of the flyweight propelled out of the plunger.
high-speed adjustment. Attendant checks diesel engines, must be loaded, tachometer and fuel gauge should have higher accuracy exports. Speed of change can be taken for the high-speed method of adjusting spring pads.
governor disconnect point adjustment. Full throttle, the increased load, to be slowing down than the rated speed to low 100 r / rain, then gradually reduce the load observed fuel exports manometer (with the load reduction, fuel outlet pressure will be increased to governor restrictions on fuel began, and then started to decline).
Continue to reduce the fuel load until exports and reduce the pressure reached its peak 70 to 140 kPa, which is governor disconnect points. At this point, diesel engine speed higher than the rated speed of 20 ~ 40 r / min to ensure that the rated speed governor before will not restricting (such as diesel engine speed is 2100 r / min), then disconnect the point speed governor for 2120 to 2140 r / min. If the governor does not meet the required splitting point value, the change will be the governor-spring behind the gasket to adjust. Ran
, And then recheck governor breakpoint speed, until the required value.
(3) high-speed diesel engine idling adjustment
When a diesel engine operating temperature, the transmission in the free position, clutch separation, open the throttle and maintain full position to observe the highest speed diesel engines. This should speed than the speed governor off point of 10% ~ 12% (depending on fans, pumps and other accessories load). If the value exceeds should troubleshooting.
(4) the fuel outlet pressure checks and adjustments
Inspection PT fuel injection pump outlet pressure of the following three methods:
check point disconnect speed governor, and then to full throttle, increasing load up to speed diesel engine rated (should be used speed and high precision table), read out the fuel outlet pressure. If the pressure below the minimum requirement or in excess of the maximum value, should be adjusted as follows: to increase the pressure on, we should pinch out the biggest opening of the throttle adjustment screws, remove the throttle shaft adjusted as necessary to join pad tablets; to reduce pressure can be reduced pads. But in any case, should not the PT fuel pump
Transferred to the export of fuel pressure above the maximum specified value.
full throttle, from low to high speed, pay attention to fuel exports greatest pressure. Manometer with appropriate buffer, this method is more reliable.
instantaneous pressure checks, first Unscrew the valve off oil pressure gauges installed on the Luosai, and then installed manometer; undocked from the throttle rod connector throttle control will be transferred to the throttle-clockwise Nail the block.
Starting diesel engines, the throttle slightly open, diesel engine speed increased to higher than idling 200 ~ 300 r / mln. Then, suddenly pull to full throttle position, to allow diesel engines to accelerate to maximum speed, and observe the pressure gauge, to the maximum instantaneous pressure, and has repeatedly tested many times. This method is simple, but is less accurate.
Check with smokeless diesel engine limiter booster, the fuel flows through the pipeline limiter was smoke should be blocked or removed.
(5) the discharge throttle inspection
To check diesel engine throttle valve discharge, should be ready to speed table, and appropriate stopwatch timer. Transmission to a free, separate clutch, throttle full, in the most high-speed diesel engine idling. Then, suddenly open up the throttle or throttle moved to the closed position, and start the stopwatch. When the diesel engine speed of 1000 r / mm, stop and pay attention to the stopwatch deceleration time, repeated several times measured.
If high-speed diesel engines idling from the slowdown after the stall (at the governor control idling diesel engines), will inevitably increase the throttle valve discharge. This can be adjusted into the fastening screws (only fixed throttle screw), the diesel engine deceleration time increased s 1-2. At this time, will be locking screw, a re-examination of Idle and, if necessary, re-adjustment.
If diesel engine deceleration slow, and should reduce the throttle valve to vent flow (prior to check-idling at the deceleration time). If this does not reduce the deceleration time, the throttle valve is not the problem if time greatly shortened, we must reduce the throttle valve discharge (rotary screw adjustment to check diesel engine deceleration. If diesel engines from the Idle speed reducer stall after another trend should continue screwed tightly onto the screw, deceleration time increased s 1-2. then screw locking. need to be adjusted in accordance with Idle)..
(1) the preparation before adjustment
Diesel engines should reach operating temperature; oil temperature should reach 74 above; injector parts numbers should be correct; flow should be in line with requirements; injector valve in accordance with the regulations and adjust better to throttle linkage transferred to the control of the whole open position (when the throttle to relax, before encountered throttle adjustment screw). Then will be installed to speed table PT fuel pump driveshafts time connecting devices.
(2) The governor of adjustment methods:
to work in a diesel engine temperature. PTG spring from the governor components covered under Luosai screw fastening to raise Idle Idle adjustment screw, installed after idling for good Luosai.
The governor with the MVS PT fuel pump, the highest speed and idle adjustment screw in the governor back, it may be the rear of the idle speed screw fastening a locking nut first, then screw or screw a screw to obtain the necessary speed. For good immediately after fastening nut locked tight to prevent air mixing.
Factories are generally provided a diesel engine idle speed [United States Cummins diesel engine series, as recommended by the idle speed (600 - 20) r / min]. Within the specified scope of the changes to allow a reasonable, but not excessive. Otherwise, it will cause difficulties linked to stall (idle speed too high) or less to load, or even diesel engines to stop.
Governor confirmed plunger is idling the reasons for the instability before the inspection in accordance with the regulations of the flyweight propelled out of the plunger.
high-speed adjustment. Attendant checks diesel engines, must be loaded, tachometer and fuel gauge should have higher accuracy exports. Speed of change can be taken for the high-speed method of adjusting spring pads.
governor disconnect point adjustment. Full throttle, the increased load, to be slowing down than the rated speed to low 100 r / rain, then gradually reduce the load observed fuel exports manometer (with the load reduction, fuel outlet pressure will be increased to governor restrictions on fuel began, and then started to decline).
Continue to reduce the fuel load until exports and reduce the pressure reached its peak 70 to 140 kPa, which is governor disconnect points. At this point, diesel engine speed higher than the rated speed of 20 ~ 40 r / min to ensure that the rated speed governor before will not restricting (such as diesel engine speed is 2100 r / min), then disconnect the point speed governor for 2120 to 2140 r / min. If the governor does not meet the required splitting point value, the change will be the governor-spring behind the gasket to adjust. Ran
, And then recheck governor breakpoint speed, until the required value.
(3) high-speed diesel engine idling adjustment
When a diesel engine operating temperature, the transmission in the free position, clutch separation, open the throttle and maintain full position to observe the highest speed diesel engines. This should speed than the speed governor off point of 10% ~ 12% (depending on fans, pumps and other accessories load). If the value exceeds should troubleshooting.
(4) the fuel outlet pressure checks and adjustments
Inspection PT fuel injection pump outlet pressure of the following three methods:
check point disconnect speed governor, and then to full throttle, increasing load up to speed diesel engine rated (should be used speed and high precision table), read out the fuel outlet pressure. If the pressure below the minimum requirement or in excess of the maximum value, should be adjusted as follows: to increase the pressure on, we should pinch out the biggest opening of the throttle adjustment screws, remove the throttle shaft adjusted as necessary to join pad tablets; to reduce pressure can be reduced pads. But in any case, should not the PT fuel pump
Transferred to the export of fuel pressure above the maximum specified value.
full throttle, from low to high speed, pay attention to fuel exports greatest pressure. Manometer with appropriate buffer, this method is more reliable.
instantaneous pressure checks, first Unscrew the valve off oil pressure gauges installed on the Luosai, and then installed manometer; undocked from the throttle rod connector throttle control will be transferred to the throttle-clockwise Nail the block.
Starting diesel engines, the throttle slightly open, diesel engine speed increased to higher than idling 200 ~ 300 r / mln. Then, suddenly pull to full throttle position, to allow diesel engines to accelerate to maximum speed, and observe the pressure gauge, to the maximum instantaneous pressure, and has repeatedly tested many times. This method is simple, but is less accurate.
Check with smokeless diesel engine limiter booster, the fuel flows through the pipeline limiter was smoke should be blocked or removed.
(5) the discharge throttle inspection
To check diesel engine throttle valve discharge, should be ready to speed table, and appropriate stopwatch timer. Transmissions to a free, separate clutch, throttle full, in the most high-speed diesel engine idling. Then, suddenly open up the throttle or throttle moved to the closed position, and start the stopwatch. When the diesel engine speed of 1000 r / mm, stop and pay attention to the stopwatch deceleration time, repeated several times measured.
If high-speed diesel engines idling from the slowdown after the stall (at the governor control idling diesel engines), will inevitably increase the throttle valve discharge. This can be adjusted into the fastening screws (only fixed throttle screw), the diesel engine deceleration time increased s 1-2. At this time, will be locking screw, a re-examination of Idle and, if necessary, re-adjustment.
If diesel engine deceleration slow, and should reduce the throttle valve to vent flow (prior to check-idling at the deceleration time). If this does not reduce the deceleration time, the throttle valve is not the problem if time greatly shortened, we must reduce the throttle valve discharge (rotary screw adjustment to check diesel engine deceleration. If diesel engines from the Idle speed reducer stall after another trend should continue screwed tightly onto the screw, deceleration time increased s 1-2. then screw locking. need to be adjusted in accordance with Idle).
