104741-6920 ZEXEL 9 460 612 271 BOSCH INJECTION-PUMP ASSEMBLY 9460612271 1047416920 8970278650

Information Cross number Calibration Data Calibration Data Ex

Information injection-pump assembly

BOSCH 9 460 612 271 9460612271

ZEXEL 104741-6920 1047416920

ISUZU 8970278650 8970278650

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Buy INJECTION-PUMP ASSEMBLY 104741-6920 zexel genuine, new aftermarket engine parts with delivery

Components :

0.	INJECTION-PUMP ASSEMBLY	104741-6920
1.	_
2.	FUEL INJECTION PUMP	104641-6900
3.	NUMBER PLATE	146920-0800
4.	_	146672-1720
5.	CAPSULE
6.	ADJUSTING DEVICE	593176-1521
7.	NOZZLE AND HOLDER ASSY	105118-5182
8.	Nozzle and Holder	8-97027-840-1
9.	Open Pre:MPa(Kqf/cm2)	18.1{185}
10.	NOZZLE-HOLDER	105048-3230
11.	NOZZLE	105017-1160

Scheme ###:

1/6.	[1]	146601-0700	PACKING RING
6.	[1]	146100-0120	SUPPLY PUMP
9.	[1]	146103-0000	COVER
10.	[2]	139104-0000	FLAT-HEAD SCREW
12.	[1]	146200-0820	DRIVE SHAFT
12/1.	[1]	146200-0800	DRIVE SHAFT
12/2.	[1]	146201-0000	WOODRUFF KEY
12/3.	[2]	146202-0100	DAMPER
12/4.	[1]	146203-0000	TOOTHED GEAR
17.	[1]	146204-0000	PLAIN WASHER
20.	[1]	146210-1720	ROLLER SET
24.	[1]	146303-0000	BEARING PIN
25.	[1]	146304-0000	BEARING PIN
26.	[1]	146305-0000	CLAMPING BAND
27.	[1]	146205-0100	SLOTTED WASHER
29.	[1]	146220-2020	CAM PLATE
30.	[1]	146600-0800	O-RING
31.	[1]	146300-0500	PUMP PLUNGER
32.	[1]	146301-0000	SLIDING PIECE
33.	[1]	146603-0700	SHIM D17.5&7.5T0.60
34.	[1]	146302-3600	COMPRESSION SPRING
34B.	[1]	146302-3500	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]	146600-0800	O-RING
37.	[1]	146310-0700	COVER
38.	[2]	146620-5000	BLEEDER SCREW
39.	[1]	146310-5100	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]	146234-0600	GUIDE PIN
50.	[1]	146402-3820	HYDRAULIC HEAD
50.	[1]	146402-3820	HYDRAULIC HEAD
50.	[1]	146402-3820	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]	146430-1420	DELIVERY-VALVE ASSEMBLY
56.	[4]	146432-0200	COMPRESSION SPRING
58.	[4]	146440-1520	FITTING
60.	[4]	139106-0100	FLAT-HEAD SCREW
67.	[1]	146820-1321	GOVERNOR COVER
67/1.	[1]	146508-6821	GOVERNOR COVER
67/2.	[1]	146515-0320	CONTROL SHAFT
67/3.	[1]	146600-0100	O-RING
67/4.	[1]	139310-0200	PLAIN WASHER
67/5.	[1]	146535-6500	CONTROL LEVER
67/5B.	[1]	146535-6600	CONTROL LEVER
67/6.	[1]	014110-6440	LOCKING WASHER
67/7.	[1]	013020-6040	UNION NUT M6P1H5
67/13.	[1]	013020-6040	UNION NUT M6P1H5
67/14.	[1]	146621-1700	UNION NUT
67/15.	[1]	146526-2800	BLEEDER SCREW
67/16.	[1]	146526-2800	BLEEDER SCREW
67/18.	[1]	146587-5000	COILED SPRING
67/23.	[1]	146628-9200	BRACKET
67/24.	[2]	139006-4500	BLEEDER SCREW
67/26.	[1]	146629-6100	BRACKET
67/78.	[1]	146600-4400	SEAL RING
67/98.	[1]	139006-4500	BLEEDER SCREW
67/100.	[1]	146628-9000	BRACKET
67/102.	[1]	146629-5920	BRACKET
67/200.	[1]	139308-0300	PLAIN WASHER
67/201.	[1]	146545-3400	THREADED PIN L53.00
67/201B.	[1]	146545-3500	THREADED PIN L55.00
67/201C.	[1]	146545-3600	THREADED PIN L57.00
67/202.	[1]	139208-0900	UNION NUT
67/203.	[1]	146600-1200	O-RING
95.	[1]	146565-7320	FULCRUM LEVER
104.	[2]	146568-0000	SLOTTED SPRING PIN
105.	[2]	026508-1140	GASKET D11.4&8.2T1
106.	[2]	146588-0500	COILED SPRING
107.	[1]	146569-0300	UNION NUT
108.	[1]	146570-0100	GOVERNOR SHAFT
109.	[1]	146600-0400	O-RING
110/1.	[1]	146571-0000	SHIM D20.2&8.3T1.05
110/1.	[1]	146571-0100	SHIM D20.2&8.3T1.25
110/1.	[1]	146571-0200	SHIM D20.2&8.3T1.45
110/1.	[1]	146571-0300	SHIM D20.2&8.3T1.65
110/1.	[1]	146571-0400	SHIM D20.2&8.3T1.85
110/1.	[1]	146571-0500	SHIM D20.2&8.3T1.15
110/1.	[1]	146571-0600	SHIM D20.2&8.3T1.35
110/1.	[1]	146571-0700	SHIM D20.2&8.3T1.55
110/1.	[1]	146571-0800	SHIM D20.2&8.3T1.75
111.	[1]	146602-0600	PLAIN WASHER D20&8.4T1.40
112.	[1]	146572-0020	FLYWEIGHT ASSEMBLY
114.	[1]	146602-0500	PLAIN WASHER D17&6.4T1.60
115.	[1]	146975-4200	SLIDING SLEEVE
116.	[1]	146576-0200	CAP
117/1.	[1]	146577-1800	PLUG L2.10
117/1.	[1]	146577-1900	PLUG L2.30
117/1.	[1]	146577-2000	PLUG L2.50
117/1.	[1]	146577-2100	PLUG L2.70
117/1.	[1]	146577-2200	PLUG L2.90
117/1.	[1]	146577-2300	PLUG L3.10
117/1.	[1]	146577-2400	PLUG L3.30
117/1.	[1]	146577-2500	PLUG L3.50
117/1.	[1]	146577-2600	PLUG L3.70
117/1.	[1]	146577-2700	PLUG L3.90
117/1.	[1]	146577-2800	PLUG L4.10
117/1.	[1]	146577-2900	PLUG L4.30
117/1.	[1]	146577-3000	PLUG L4.50
117/1.	[1]	146577-3100	PLUG L4.70
117/1.	[1]	146577-3200	PLUG L4.90
117/1.	[1]	146577-3300	PLUG L5.10
117/1.	[1]	146577-6700	PLUG L2.2
117/1.	[1]	146577-6800	PLUG L2.4
117/1.	[1]	146577-6900	PLUG L2.6
117/1.	[1]	146577-7000	PLUG L2.8
117/1.	[1]	146577-7100	PLUG L3.0
117/1.	[1]	146577-7200	PLUG L3.2
117/1.	[1]	146577-7300	PLUG L3.4
117/1.	[1]	146577-7400	PLUG L3.6
117/1.	[1]	146577-7500	PLUG L3.8
117/1.	[1]	146577-7600	PLUG L4.0
117/1.	[1]	146577-7700	PLUG L4.2
117/1.	[1]	146577-7800	PLUG L4.4
117/1.	[1]	146577-7900	PLUG L4.6
117/1.	[1]	146577-8000	PLUG L4.8
117/1.	[1]	146577-8100	PLUG L5.0
117/1.	[1]	146877-0000	PLUG L5.2
117/1.	[1]	146877-0100	PLUG L5.3
117/1.	[1]	146877-0200	PLUG L5.4
117/1.	[1]	146877-0300	PLUG L5.5
117/1.	[1]	146877-4700	PLUG
117/1.	[1]	146877-4800	PLUG
117/1.	[1]	146877-4900	PLUG
117/1.	[1]	146877-5000	PLUG
120.	[1]	146579-9820	RETAINING PIN
122.	[1]	146580-0500	GOVERNOR SPRING
123.	[4]	139106-0200	FLAT-HEAD SCREW
130.	[1]	146421-0320	CAPSULE
130/2.	[1]	026508-1140	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]	146110-0720	CONTROL VALVE
135/5.	[1]	146114-0000	SPRING WASHER
136.	[1]	146120-0020	OVER FLOW VALVE
137.	[2]	139512-0500	GASKET
138.	[1]	146605-5820	INLET UNION
159.	[1]	146628-7220	PLATE
160.	[1]	146625-8020	PLATE
205.	[1]	025804-1610	WOODRUFF KEY
206.	[1]	013121-4140	UNION NUT M14P1.5H11
207.	[1]	029321-4050	LOCKING WASHER
240.	[1]	146650-1220	PULLING ELECTROMAGNET
240/8.	[1]	146600-1700	O-RING
242.	[1]	146658-7320	WIRE
243.	[1]	146621-1000	UNION NUT
245.	[2]	139512-0500	GASKET
246.	[1]	027412-2440	EYE BOLT
247.	[1]	146609-4620	INLET UNION
260.	[1]	146611-0720	BRACKET
261.	[2]	146621-4700	UNION NUT
264.	[1]	016500-5010	O-RING
270.	[1]	146615-2021	TOOTHED GEAR
270/1.	[1]	146615-2000	TOOTHED GEAR
270/2.	[1]	146615-0201	COUPLING PLATE
270/3.	[6]	020006-1870	BLEEDER SCREW M6P1L18 7T
800S.	[1]	146009-9420	PUMP HOUSING
800S/1/6.	[1]	146601-0700	PACKING RING
804S.	[1]	146232-0720	COMPRESSION SPRING
805S.	[1]	146574-0120	PARTS SET
810S.	[1]	146600-1120	REPAIR SET
821S.	[1]	146210-5720	ROLLER SET
835S.	[1]	146598-1000	CAP
836S/1.	[1]	146598-0600	CAP L18
836S/1.	[1]	146598-0700	CAP L21
836S/1.	[1]	146598-0800	CAP L24
836S/1.	[1]	146598-0900	CAP L27
903.	[1]	146672-1720	PULSE GENERATOR
903/2.	[1]	146600-1300	O-RING &13W1.9
905.	[1]	593176-1521	ADJUSTING DEVICE
905/2.	[1]	535020-3220	BRACKET
906.	[1]	146920-0800	NAMEPLATE
912.	[2]	139006-6600	BLEEDER SCREW

Include in #2:

104741-6920 as INJECTION-PUMP ASSEMBLY

Cross reference number

BOSCH 9 460 612 271 9460612271

ZEXEL 104741-6920 1047416920

ISUZU 8970278650 8970278650

Zexel num

Bosch num

Firm num

Name

104741-6920
104741-5610

9 460 612 271

8970278650 ISUZU

INJECTION-PUMP ASSEMBLY
4JA1 * K

Calibration Data:

Adjustment conditions

Test oil
1404 Test oil ISO4113orSAEJ967d

Test oil temperature degC 45 45 50

Nozzle 105780-0 060

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)
Left L

Injection timing adjustment

Pump speed r/min 1150 1150 1150

Average injection quantity mm3/st. 51.7 51.2 52.2

Difference in delivery mm3/st. 4

Basic *

Injection timing adjustment_02

Pump speed r/min 2400 2400 2400

Average injection quantity mm3/st. 23.1 19.6 26.6

Injection timing adjustment_03

Pump speed r/min 2000 2000 2000

Average injection quantity mm3/st. 55.6 51.6 59.6

Injection timing adjustment_04

Pump speed r/min 1150 1150 1150

Average injection quantity mm3/st. 51.7 50.7 52.7

Injection timing adjustment_05

Pump speed r/min 1000 1000 1000

Average injection quantity mm3/st. 45.9 42.9 48.9

Injection timing adjustment_06

Pump speed r/min 500 500 500

Average injection quantity mm3/st. 32.7 29.2 36.2

Injection quantity adjustment

Pump speed r/min 2400 2400 2400

Average injection quantity mm3/st. 23.1 20.1 26.1

Difference in delivery mm3/st. 4

Basic *

Injection quantity adjustment_02

Pump speed r/min 2700 2700 2700

Average injection quantity mm3/st. 12

Governor adjustment

Pump speed r/min 375 375 375

Average injection quantity mm3/st. 8.4 6.4 10.4

Difference in delivery mm3/st. 2

Basic *

Governor adjustment_02

Pump speed r/min 550 550 550

Average injection quantity mm3/st. 3

Governor adjustment_03

Pump speed r/min 375 375 375

Average injection quantity mm3/st. 8.4 6.4 10.4

Timer adjustment

Pump speed r/min 100 100 100

Average injection quantity mm3/st. 80 60 100

Basic *

Speed control lever angle

Pump speed r/min 375 375 375

Average injection quantity mm3/st. 0 0 0

Remarks
Magnet OFF

0000000901

Pump speed r/min 1500 1500 1500

Overflow quantity cm3/min 450 318 582

Stop lever angle

Pump speed r/min 1500 1500 1500

Pressure kPa 480.5 461 500

Pressure kgf/cm2 4.9 4.7 5.1

Basic *

Stop lever angle_02

Pump speed r/min 1500 1500 1500

Pressure kPa 480.5 461 500

Pressure kgf/cm2 4.9 4.7 5.1

Stop lever angle_03

Pump speed r/min 2000 2000 2000

Pressure kPa 637.5 608 667

Pressure kgf/cm2 6.5 6.2 6.8

0000001101

Pump speed r/min 1500 1500 1500

Timer stroke mm 4.9 4.7 5.1

Basic *

_02

Pump speed r/min 1000 1000 1000

Timer stroke mm 2.2 1.6 2.8

_03

Pump speed r/min 1500 1500 1500

Timer stroke mm 4.9 4.6 5.2

_04

Pump speed r/min 2000 2000 2000

Timer stroke mm 7.4 7 7.8

0000001201

Max. applied voltage V 8 8 8

Test voltage V 13 12 14

Timing setting

K dimension mm 3.1 3 3.2

KF dimension mm 5.5 5.4 5.6

MS dimension mm 0.7 0.6 0.8

Pre-stroke mm 0.45 0.43 0.47

Control lever angle alpha deg. 18 14 22

Control lever angle beta deg. 37 32 42

Test data Ex:

0000001801 V-FICD ADJUSTMENT

Adjustment of the V-FICD 1. Adjust the actuator rod to obtain S1. 2. Apply negative pressure P1 kPa {P2 mmHg} to the actuator and confirm that it moves through its full stroke. (A) Control lever (Idling position)
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S1=1+1mm P1=-53.3kPa P2=-400mmHg
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S1=1+1mm

Information:

(4) VOP (Valve Opening Pressure) Test A. Open the gauge protector valve [0-34500 kPa (0-5000 psi) gauge].B. Increase the pressure until test oil flows from the nozzle tip.C. Write down the VOP. (5) Pressure Loss Test A. Increase the pressure to 690 kPa (100 psi) less than the VOP.B. Close the pump isolator valve (6).C. Use the gauge protector valve (3), [0-34500 kPa (0-5000 psi) gauge] to adjust pressure to 690 kPa (100 psi) less than the VOP.D. After 30 seconds, write down the pressure loss. (6) Adjustment of Valve Opening Pressure If spray characteristics are satisfactory, adjust the valve unseating pressure: Use 7B2591 Cap Wrench (7) to remove the cap. Remove lift screw locknut (8) and loosen lift adjustment screw (9) approximately three turns, so it does not interfere with the pressure adjustment. Loosen pressure adjustment locknut (10).E. Install the nozzle on the 5P4150 Nozzle Tester. F. Use 7B2601 Wrench (11) and adjust the VOP. G. Remove the valve from the nozzle tester and put it in a vise. Install lift adjustment screw locknut (8).H. Use the 6B1655 Wrench to turn lift adjusting screw (9) down lightly against the stem of the fuel valve spring.I. Clamp the needle lift adjustment fixture to the fuel valve body.J. Use a thickness gauge and adjust screw (12) until there is a clearance of 0.43 (.017") between screw (12) and lift adjustment screw (9).K. Hold screw (12) in position with clamping screw (13).L. Remove the thickness gauge and loosen lift adjustment screw (9) until there is 0.3 (.010") clearance between screw (9) and screw (12), after lift screw locknut (8) is tightened with the 7B2587 Wrench. The correct needle lift setting for all valves is 0.177 (.007").Cleaning Needle, Nozzle And Nozzle End Of Flat Seat Valves (Except 1P1795 Master Valves)
(1) Remove cap (1), bonnet (2) or unseating pressure adjusting screw, spring retainer, spring (3) and spring stem (4). Put the correct needle extracting tool (5) through the valve body and tighten over the end of the needle. If the needle is tight, install a new valve service group, or disassemble and clean the valve according to the procedure that follows. (2) If a fuel valve has a chip of scale, metal or foreign material on the seat, this will prevent the needle, from seating on the spray valve nozzle end, and cause the inner surface of the nozzle end and the needle end to become coated with carbon. Put carbon scraper (6) in the needle extracting tool and insert it into the nozzle bore and against the nozzle end; carefully turn the tool one revolution, with a slight pressure to remove the carbon. The cutting surface of scraper (6) has been lapped as perfectly flat and square with the center line of the tool as possible. Unless it remains so, it cannot effectively remove carbon. Handle this tool with care. Two scrapers are provided, so if one becomes marred, the second can be used while another is being obtained.