104701-2020 ZEXEL 9 460 611 163 BOSCH INJECTION-PUMP ASSEMBLY 9460611163 1047012020

Information Cross number Calibration Data Calibration Data Ex

Information injection-pump assembly

BOSCH 9 460 611 163 9460611163

ZEXEL 104701-2020 1047012020

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Components :

0.	INJECTION-PUMP ASSEMBLY	104701-2020
1.	_
2.	FUEL INJECTION PUMP	104601-2020
3.	NUMBER PLATE	148633-0600
4.	_
5.	CAPSULE
6.	ADJUSTING DEVICE
7.	NOZZLE AND HOLDER ASSY	105148-1221
8.	Nozzle and Holder	16600-63G01
9.	Open Pre:MPa(Kqf/cm2)	9.8{100}
10.	NOZZLE-HOLDER	105078-0050
11.	NOZZLE	105007-1210

Scheme ###:

6.	[1]	146100-0020	SUPPLY PUMP
9.	[1]	148103-0300	COVER
10.	[2]	139104-0000	FLAT-HEAD SCREW
12.	[1]	148200-0620	DRIVE SHAFT
12/3.	[1]	146201-0000	WOODRUFF KEY
17.	[1]	146204-0000	PLAIN WASHER
20.	[1]	148210-0220	ROLLER SET
24.	[1]	146303-0000	BEARING PIN
25.	[1]	146304-0000	BEARING PIN
26.	[1]	146305-0000	CLAMPING BAND
27.	[1]	146205-0000	SLOTTED WASHER
29.	[1]	146220-4520	CAM PLATE
30.	[1]	146600-3000	O-RING
31.	[1]	146300-1900	PUMP PLUNGER
32.	[1]	146301-0200	SLIDING PIECE
33.	[1]	146603-0700	SHIM D17.5&7.5T0.60
34.	[1]	146306-2100	COMPRESSION SPRING
35/1.	[0]	146603-0700	SHIM D17.5&7.5T0.60
35/1.	[0]	146603-0800	SHIM D17.5&7.5T0.70
35/1.	[0]	146603-0900	SHIM D17.5&7.5T0.90
35/1.	[0]	146603-1000	SHIM D17.5&7.5T1.00
35/1.	[0]	146603-1100	SHIM D17.5&7.5T1.20
35/1.	[0]	146603-3600	SHIM D17.5&7.5T2.40
36.	[1]	146600-3000	O-RING
37.	[1]	146310-0700	COVER
38.	[2]	146620-5000	BLEEDER SCREW
39.	[1]	146310-0100	COVER
40.	[2]	146620-5000	BLEEDER SCREW
43.	[1]	146230-0000	SHIM
44.	[1]	146230-0100	PLAIN WASHER
45.	[1]	146231-0001	SLOTTED WASHER
47.	[2]	146233-0000	SLOTTED WASHER
48/1.	[1]	146603-0000	SHIM D17.0&5.2T0.50
48/1.	[1]	146603-0100	SHIM D17.0&5.2T0.80
48/1.	[1]	146603-0200	SHIM D17.0&5.2T1.00
48/1.	[1]	146603-0300	SHIM D17.0&5.2T1.20
48/1.	[1]	146603-0400	SHIM D17.0&5.2T1.50
48/1.	[1]	146603-0500	SHIM D17.0&5.2T1.80
48/1.	[1]	146603-0600	SHIM D17.0&5.2T2.00
48/1.	[1]	146690-1400	SHIM D17&5.2T0.9
48/1.	[1]	146690-1500	SHIM D17&5.2T1.1
48/1.	[1]	146690-1600	SHIM D17&5.2T1.3
48/1.	[1]	146690-1700	SHIM D17&5.2T1.4
48/1.	[1]	146690-1800	SHIM D17&5.2T1.6
48/1.	[1]	146690-1900	SHIM D17&5.2T1.7
48/1.	[1]	146690-5800	SHIM
48/1.	[1]	146690-5900	SHIM
48/1.	[1]	146690-6000	SHIM
48/1.	[1]	146690-6100	SHIM
48/1.	[1]	146690-6200	SHIM
48/1.	[1]	146690-6300	SHIM
48/1.	[1]	146690-6400	SHIM
48/1.	[1]	146690-6500	SHIM
48/1.	[1]	146690-6600	SHIM
48/1.	[1]	146690-6700	SHIM
48/1.	[1]	146690-6800	SHIM
48/1.	[1]	146690-6900	SHIM
48/1.	[1]	146690-7000	SHIM
48/1.	[1]	146690-7100	SHIM
48/1.	[1]	146690-7200	SHIM
48/1.	[1]	146690-7300	SHIM
48/1.	[1]	146690-7400	SHIM
48/1.	[1]	146690-7500	SHIM
48/1.	[1]	146690-7800	SHIM
49.	[2]	146234-0120	GUIDE PIN
50.	[1]	146403-6120	HYDRAULIC HEAD
50.	[1]	146403-6120	HYDRAULIC HEAD
50.	[1]	146403-6120	HYDRAULIC HEAD
51.	[1]	146600-0000	O-RING
52/1.	[1]	146420-0000	SHIM D9.5&3.0T1.90
52/1.	[1]	146420-0100	SHIM D9.5&3.0T1.92
52/1.	[1]	146420-0200	SHIM D9.5&3.0T1.94
52/1.	[1]	146420-0300	SHIM D9.5&3.0T1.96
52/1.	[1]	146420-0400	SHIM D9.5&3.0T1.98
52/1.	[1]	146420-0500	SHIM D9.5&3.0T2.00
52/1.	[1]	146420-0600	SHIM D9.5&3.0T2.02
52/1.	[1]	146420-0700	SHIM D9.5&3.0T2.04
52/1.	[1]	146420-0800	SHIM D9.5&3.0T2.06
52/1.	[1]	146420-0900	SHIM D9.5&3.0T2.08
52/1.	[1]	146420-1000	SHIM D9.5&3.0T2.10
52/1.	[1]	146420-1100	SHIM D9.5&3.0T2.12
52/1.	[1]	146420-1200	SHIM D9.5&3.0T2.14
52/1.	[1]	146420-1300	SHIM D9.5&3.0T2.16
52/1.	[1]	146420-1400	SHIM D9.5&3.0T2.18
52/1.	[1]	146420-1500	SHIM D9.5&3.0T2.20
52/1.	[1]	146420-1600	SHIM D9.5&3.0T2.22
52/1.	[1]	146420-1700	SHIM D9.5&3.0T2.24
52/1.	[1]	146420-1800	SHIM D9.5&3.0T2.26
52/1.	[1]	146420-1900	SHIM D9.5&3.0T2.28
52/1.	[1]	146420-2000	SHIM D9.5&3.0T2.30
52/1.	[1]	146420-2100	SHIM D9.5&3.0T2.32
52/1.	[1]	146420-2200	SHIM D9.5&3.0T2.34
52/1.	[1]	146420-2300	SHIM D9.5&3.0T2.36
52/1.	[1]	146420-2400	SHIM D9.5&3.0T2.38
52/1.	[1]	146420-2500	SHIM D9.5&3.0T2.40
52/1.	[1]	146420-2600	SHIM D9.5&3.0T2.42
52/1.	[1]	146420-2700	SHIM D9.5&3.0T2.44
52/1.	[1]	146420-2800	SHIM D9.5&3.0T2.46
52/1.	[1]	146420-2900	SHIM D9.5&3.0T2.48
52/1.	[1]	146420-3000	SHIM D9.5&3.0T2.50
52/1.	[1]	146420-3100	SHIM D9.5&3.0T2.52
52/1.	[1]	146420-3200	SHIM D9.5&3.0T2.54
52/1.	[1]	146420-3300	SHIM D9.5&3.0T2.56
52/1.	[1]	146420-3400	SHIM D9.5&3.0T2.58
52/1.	[1]	146420-3500	SHIM D9.5&3.0T2.60
52/1.	[1]	146420-3600	SHIM D9.5&3.0T2.62
52/1.	[1]	146420-3700	SHIM D9.5&3.0T2.64
52/1.	[1]	146420-3800	SHIM D9.5&3.0T2.66
52/1.	[1]	146420-3900	SHIM D9.5&3.0T2.68
52/1.	[1]	146420-4000	SHIM D9.5&3.0T2.70
52/1.	[1]	146420-4100	SHIM D9.5&3.0T2.72
52/1.	[1]	146420-4200	SHIM D9.5&3.0T2.74
52/1.	[1]	146420-4300	SHIM D9.5&3.0T2.76
52/1.	[1]	146420-4400	SHIM D9.5&3.0T2.78
52/1.	[1]	146420-4500	SHIM D9.5&3.0T2.80
52/1.	[1]	146420-4600	SHIM D9.5&3.0T2.82
52/1.	[1]	146420-4700	SHIM D9.5&3.0T2.84
52/1.	[1]	146420-4800	SHIM D9.5&3.0T2.86
52/1.	[1]	146420-4900	SHIM D9.5&3.0T2.88
52/1.	[1]	146420-5000	SHIM D9.5&3.0T2.90
52/1.	[1]	146420-5100	SHIM D9.5&3.0T1.74
52/1.	[1]	146420-5200	SHIM D9.5&3.0T1.76
52/1.	[1]	146420-5300	SHIM D9.5&3.0T1.78
52/1.	[1]	146420-5400	SHIM D9.5&3.0T1.80
52/1.	[1]	146420-5500	SHIM D9.5&3.0T1.82
52/1.	[1]	146420-5600	SHIM D9.5&3.0T1.84
52/1.	[1]	146420-5700	SHIM D9.5&3.0T1.86
52/1.	[1]	146420-5800	SHIM D9.5&3.0T1.88
54.	[4]	146433-0100	GASKET D12&6.4T1.00
55.	[4]	146430-0320	DELIVERY-VALVE ASSEMBLY
56.	[4]	146432-0700	COMPRESSION SPRING
58.	[4]	146440-0220	FITTING
60.	[3]	139106-0100	FLAT-HEAD SCREW
123.	[1]	146620-8800	FLAT-HEAD SCREW
130.	[1]	146421-1020	CAPSULE
130/2.	[1]	139508-0200	GASKET D11.4&8.2T1
130/3.	[1]	146422-0300	BLEEDER SCREW
130/4.	[1]	146600-0500	O-RING
133.	[1]	146600-0600	O-RING
134.	[1]	146600-0700	O-RING
135.	[1]	146110-1120	CONTROL VALVE
135/5.	[1]	146114-0000	SPRING WASHER
136.	[1]	148120-0020	OVER FLOW VALVE
137.	[3]	139512-0200	GASKET D18.5&12.2T1.00
138.	[1]	146668-0320	INLET UNION
158.	[1]	146614-6900	SPACER BUSHING
200.	[1]	146206-0100	COILED SPRING
230.	[1]	148613-0900	BRACKET
236.	[1]	146620-2700	HEX-SOCKET-HEAD CAP SCREW
237.	[1]	146620-0200	HEX-SOCKET-HEAD CAP SCREW
239.	[1]	023500-5140	PLAIN WASHER D10.0&5.3T1.00
240.	[1]	146688-0120	PULLING ELECTROMAGNET
240/8.	[1]	146600-1700	O-RING
242.	[1]	407911-1430	CONTROL UNIT
243.	[1]	013020-5240	UNION NUT M5P0.8H4
244.	[1]	020145-1040	BLEEDER SCREW
245.	[3]	139512-0200	GASKET D18.5&12.2T1.00
246.	[1]	139812-0500	EYE BOLT
247.	[1]	146668-0720	INLET UNION
248.	[1]	146614-0200	SPACER BUSHING
360.	[1]	146649-8800	BUSHING
361.	[1]	146649-8900	CAP
362.	[2]	010235-3040	HEX-SOCKET-HEAD CAP SCREW
504/1.	[1]	146649-4500	RESISTER
504/1.	[1]	146649-4600	RESISTER
504/1.	[1]	146649-4700	RESISTER
504/1.	[1]	146649-4800	RESISTER
504/1.	[1]	146649-4900	RESISTER
504/1.	[1]	146649-5000	RESISTER
504/1.	[1]	146649-5100	RESISTER
504/1.	[1]	146649-5200	RESISTER
504/1.	[1]	146649-5300	RESISTER
504/1.	[1]	146649-5400	RESISTER
504/1.	[1]	146649-5500	RESISTER
504/1.	[1]	146649-5600	RESISTER
504/1.	[1]	146649-5700	RESISTER
505.	[1]	148531-0520	GOVERNOR;ELECTRIC
506.	[3]	146620-8900	FLAT-HEAD SCREW
515.	[1]	106144-1051	TIMING CONTROL VALVE
515/12.	[1]	161440-3800	O-RING
515/13.	[1]	161440-3700	O-RING
516.	[2]	010206-1440	HEX-SOCKET-HEAD CAP SCREW M6P1L14
531.	[1]	479773-9021	PULSE GENERATOR
531/6.	[1]	479773-6500	O-RING
800S.	[1]	148009-0320	PUMP HOUSING
800S/1/6.	[1]	146601-0900	PACKING RING
804S.	[1]	146232-0720	COMPRESSION SPRING
878S.	[1]	148600-1300	SEAL RING
906.	[1]	148633-0600	NAMEPLATE

Include in #2:

104701-2020 as INJECTION-PUMP ASSEMBLY

Cross reference number

BOSCH 9 460 611 163 9460611163

ZEXEL 104701-2020 1047012020

Zexel num

Bosch num

Firm num

Name

104701-2020
104701-2021

9 460 611 163

INJECTION-PUMP ASSEMBLY
* K

Calibration Data:

Adjustment conditions

Test oil
1404 Test oil ISO4113orSAEJ967d

Test oil temperature degC 45 45 50

Nozzle 105780-0060

Bosch type code NP-DN0SD1510

Nozzle holder 105780-2150

Opening pressure MPa 13 13 13.3

Opening pressure kgf/cm2 133 133 136

Injection pipe 157805-7320

Injection pipe
Inside diameter - outside diameter - length (mm) mm 2-6-450

Joint assembly 157641-4720

Tube assembly 157641-4020

Transfer pump pressure kPa 20 20 20

Transfer pump pressure kgf/cm2 0.2 0.2 0.2

Direction of rotation (viewed from drive side)
Right R

Governor adjustment

Pump speed r/min 1000 1000 1000

TCV duty (%) F TCV 60Hz % 100 100 100

U alpha soll V 2.7 2.7 2.7

Pump chamber pressure kPa 617.5 588 647

Pump chamber pressure kgf/cm2 6.3 6 6.6

Basic *

Governor adjustment_02

Pump speed r/min 100 100 100

TCV duty (%) F TCV 60Hz % 100 100 100

U alpha soll V 2.7 2.7 2.7

Pump chamber pressure kPa 294 294

Pump chamber pressure kgf/cm2 3 3

Governor adjustment_03

Pump speed r/min 1000 1000 1000

TCV duty (%) F TCV 60Hz % 100 100 100

U alpha soll V 2.7 2.7 2.7

Pump chamber pressure kPa 618 579 657

Pump chamber pressure kgf/cm2 6.3 5.9 6.7

Governor adjustment_04

Pump speed r/min 2000 2000 2000

TCV duty (%) F TCV 60Hz % 100 100 100

U alpha soll V 2.7 2.7 2.7

Pump chamber pressure kPa 755 706 804

Pump chamber pressure kgf/cm2 7.7 7.2 8.2

Boost compensator adjustment

Pump speed r/min 1000 1000 1000

TCV duty (%) F TCV 60Hz % 70 70 70

U alpha soll V 2.7 2.7 2.7

Timer stroke mm 4.1 3.9 4.3

Basic *

Boost compensator adjustment_02

Pump speed r/min 500 500 500

TCV duty (%) F TCV 60Hz % 100 100 100

U alpha soll V 2.7 2.7 2.7

Timer stroke mm 7.4 5.4 9.4

Boost compensator adjustment_03

Pump speed r/min 1000 1000 1000

TCV duty (%) F TCV 60Hz % 100 100 100

U alpha soll V 2.7 2.7 2.7

Timer stroke mm 8.1 6.1 10.1

Boost compensator adjustment_04

Pump speed r/min 1000 1000 1000

TCV duty (%) F TCV 60Hz % 70 70 70

U alpha soll V 2.7 2.7 2.7

Timer stroke mm 4.1 3.8 4.4

Boost compensator adjustment_05

Pump speed r/min 1000 1000 1000

TCV duty (%) F TCV 60Hz % 0 0 0

U alpha soll V 2.7 2.7 2.7

Timer stroke mm 0 0 0

Boost compensator adjustment_06

Pump speed r/min 1500 1500 1500

TCV duty (%) F TCV 60Hz % 100 100 100

U alpha soll V 2.7 2.7 2.7

Timer stroke mm 9.75 9.3 10.2

Speed control lever angle

Pump speed r/min 1000 1000 1000

TCV duty (%) F TCV 60Hz % 100 100 100

U alpha soll V 2.7 2.7 2.7

Overflow quantity cm3/min 600 470 730

0000000901

Pump speed r/min 1000 1000 1000

U alpha soll + dU alpha soll V 2.8 2.8 2.8

TCV duty (%) F TCV 60Hz % 100 100 100

Average injection quantity mm3/st. 80.5 80 81

Difference in delivery mm3/st. 5

Basic *

_02

Pump speed r/min 375 375 375

U alpha soll + dU alpha soll V 1.89 1.89 1.89

TCV duty (%) F TCV 60Hz % 100 100 100

Average injection quantity mm3/st. 7 4 10

Difference in delivery mm3/st. 2

Basic *

Remarks
Confirmation of difference in delivery

_03

Pump speed r/min 2500 2500 2500

U alpha soll + dU alpha soll V 1.66 1.66 1.66

TCV duty (%) F TCV 60Hz % 100 100 100

Average injection quantity mm3/st. 16.1 13.6 18.6

Difference in delivery mm3/st. 5

Basic *

Remarks
Confirmation of difference in delivery

_04

Pump speed r/min 100 100 100

U alpha soll + dU alpha soll V 3.5 3.5 3.5

TCV duty (%) F TCV 60Hz % 100 100 100

Average injection quantity mm3/st. 83.3 73.3 93.3

_05

Pump speed r/min 375 375 375

U alpha soll + dU alpha soll V 1.89 1.89 1.89

TCV duty (%) F TCV 60Hz % 100 100 100

Average injection quantity mm3/st. 7 4 10

_06

Pump speed r/min 500 500 500

U alpha soll + dU alpha soll V 2.49 2.49 2.49

TCV duty (%) F TCV 60Hz % 100 100 100

Average injection quantity mm3/st. 50.1 48.1 52.1

_07

Pump speed r/min 800 800 800

U alpha soll + dU alpha soll V 1.86 1.86 1.86

TCV duty (%) F TCV 60Hz % 100 100 100

Average injection quantity mm3/st. 15.4 13.4 17.4

_08

Pump speed r/min 800 800 800

U alpha soll + dU alpha soll V 2.62 2.62 2.62

TCV duty (%) F TCV 60Hz % 100 100 100

Average injection quantity mm3/st. 64.4 62.4 66.4

_09

Pump speed r/min 1000 1000 1000

U alpha soll + dU alpha soll V 1.85 1.85 1.85

TCV duty (%) F TCV 60Hz % 100 100 100

Average injection quantity mm3/st. 16.6 14.6 18.6

_10

Pump speed r/min 1000 1000 1000

U alpha soll + dU alpha soll V 2.8 2.8 2.8

TCV duty (%) F TCV 60Hz % 100 100 100

Average injection quantity mm3/st. 80.5 79.5 81.5

_11

Pump speed r/min 2000 2000 2000

U alpha soll + dU alpha soll V 2.58 2.58 2.58

TCV duty (%) F TCV 60Hz % 100 100 100

Average injection quantity mm3/st. 63.7 61.7 65.7

_12

Pump speed r/min 2250 2250 2250

U alpha soll + dU alpha soll V 2.43 2.43 2.43

TCV duty (%) F TCV 60Hz % 100 100 100

Average injection quantity mm3/st. 54.3 51.8 56.8

_13

Pump speed r/min 2500 2500 2500

U alpha soll + dU alpha soll V 1.66 1.66 1.66

TCV duty (%) F TCV 60Hz % 100 100 100

Average injection quantity mm3/st. 16.1 13.6 18.6

_14

Pump speed r/min 2500 2500 2500

U alpha soll + dU alpha soll V 1 1 1

TCV duty (%) F TCV 60Hz % 100 100 100

Average injection quantity mm3/st. 3

Stop lever angle

Pump speed r/min 375 375 375

U alpha soll + dU alpha soll V 1.89 1.89 1.89

TCV duty (%) F TCV 60Hz % 0 0 0

Average injection quantity cm3/min 0 0 0

Stop lever angle_02

Pump speed r/min 2250 2250 2250

U alpha soll + dU alpha soll V 2.43 2.43 2.43

TCV duty (%) F TCV 60Hz % 100 100 100

Average injection quantity cm3/min 0 0 0

0000001101

Pump speed r/min 200 200 200

TCV duty (%) F TCV 60Hz % 100 100 100

U alpha soll V 2.7 2.7 2.7

Speed output
N=Measure the actual speed. r/min N+-8

0000001201

Pump speed r/min 1000 1000 1000

TCV duty (%) F TCV 60Hz % 100 100 100

U alpha soll V 2.8 2.8 2.8

Temperature output
Measure T = actual output temperature degC T+-5

0000001301

Max. applied voltage V 8 8 8

Test voltage V 13 12 14

0000001401

K dimension mm 3.3 3.2 3.4

KF dimension mm 5.62 5.52 5.72

Pre-stroke mm 0.1 0.08 0.12

Test data Ex:

Injection timing adjustment Comp. resistor/voltage

Compensation resistance/compensation voltage comparison A = Compensation resistor number B= Compensation resistance C = Compensation voltage delta U alpha soll
----------

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0000001601 HARNESS & CONNECTOR

Corrugated tube assembly specification (1)Maintain the corrugated tube so that the dimension of the end of the connector and the end of the corrugated are as shown in the figure. (2)At K, pull the Q adjustment resistor towards the clip. (3)Wrap black vinyl tape 4 times around the end of the corrugated tube to fix the tube. A:RS08M-GY B:RS06M-GY C:RS03M-B D:RS03M-GY E:Corrugated tube F:Tube end face G:Q adjustment resistor J:PVC tape
----------

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L1=25+-10mm L2=60+-10mm L3=100+-10mm L4=140+-10mm

0000001701 HARNESS & CONNECTOR

Injection quantity adjustment compensation resistor assembly standards (1)Fix the injection quantity adjustment compensation resistor (Q adjustment resistor) using clips. (2)After fixing the corrugated tube, fix the clip (attached to the Q adjustment resistor) in the direction shown by the arrow in the figure (each connector clip side) at the position where the standard dimension from the end of the corrugated tube is L1. (3)After confirming that the Q adjustment resistor is fixed in the position as shown by the arrow in diagram, cut off the excess clip to leave L2. A:End of corrugated tube B:Injection quantity adjustment compensation resistor (Q adjustment resistor) C:After attaching the clip to the Q adjustment resistor, fix the corrugated tube. K:Figure shown by arrow
----------

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L1=75+-10mm L2=(10mm)

Information:

The fuel system is a pressure type with a separate injection pump and injection valve for each cylinder. Fuel is injected into a precombustion chamber, not directly into the cylinder.A transfer pump supplies fuel filtered through primary (optional) and final filters to a manifold in the injection pump housing.The transfer pump supplies more fuel than is required for injection, so a bypass valve is built into the pressure side of the pump. The valve limits the maximum pressure within the supply system.An air vent valve located on the fuel filter base permits the removal of air in the injection pump supply system after servicing the filter or whenever air is allowed to enter the system. Air is removed by opening the valve and pressurizing the fuel system. The priming pump. The vent valve must be open and the pump operated until a stream of fuel, without air bubbles, flows from the vent line. Fuel Injection Pump Operation
Fuel enters the fuel injection pump housing from the fuel filter through the fuel manifold and enters the fuel injection pump through the inlet port. The injection pump plungers and lifters are lifted by the cam lobes on the fuel system's own camshaft and always make a full stroke. The lifters are held against the cam lobes by springs. Each pump measures the amount of fuel to be injected into its respective cylinder and delivers it to the fuel injection nozzle.The amount of fuel pumped per stroke is varied by turning the plunger in the barrel. The plunger is turned by the governor action through the gear segmented sliding rack which turns the gear segment on the bottom of the pump plunger. The position of the scroll on the plunger determines the amount of fuel injected into the cylinders. Fuel Pump
Figures A, B and C illustrate the functioning of an injection pump as the plunger makes a stroke.In Fig. A the plunger is down and the inlet port is uncovered. Fuel flows into the space above the plunger through the slot and into the recess around the plunger.In Fig. B the plunger has started up and the port is covered. The fuel is trapped and will be forced through a check valve, fuel line, and injection valve.In Fig. C the plunger has risen until the port is uncovered by the recess in the plunger. The fuel can now escape back through the port into the fuel manifold and injection will cease.Note that the recess in the pump plunger forms a helix around the upper end of the plunger. Figures D, E and F illustrate how rotating the pump plunger affects the quantity of fuel injected.In Fig. D the plunger has been rotated into the shut-off position. The slot connecting the top of the plunger with the recess is in line with the port; therefore, no fuel can be trapped and injected.In Fig. E the plunger has been rotated into the idling position. The narrow part of the plunger formed by the helix