104746-1440 ZEXEL 9 460 611 694 BOSCH INJECTION-PUMP ASSEMBLY 9460611694 1047461440 8971105590

Information Cross number Calibration Data Calibration Data Ex

Information injection-pump assembly

BOSCH 9 460 611 694 9460611694

ZEXEL 104746-1440 1047461440

ISUZU 8971105590 8971105590

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Buy INJECTION-PUMP ASSEMBLY 104746-1440 zexel genuine, new aftermarket engine parts with delivery

Components :

0.	INJECTION-PUMP ASSEMBLY	104746-1440
1.	_
2.	FUEL INJECTION PUMP	104646-1440
3.	NUMBER PLATE	146924-3000
4.	_	146672-1720
5.	CAPSULE
6.	ADJUSTING DEVICE
7.	NOZZLE AND HOLDER ASSY	105158-2311
8.	Nozzle and Holder	8-97088-674-0
9.	Open Pre:MPa(Kqf/cm2)	14.7{150}
10.	NOZZLE-HOLDER	105088-1130
11.	NOZZLE	105007-1271

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]	146200-0320	DRIVE SHAFT
12/1.	[1]	146200-0300	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]	146210-5120	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]	146220-2120	CAM PLATE
30.	[1]	146600-0800	O-RING
31.	[1]	146300-2400	PUMP PLUNGER
32.	[1]	146301-0000	SLIDING PIECE
33.	[1]	146603-0700	SHIM D17.5&7.5T0.60
34.	[1]	146302-3400	COMPRESSION SPRING
34B.	[1]	146302-3500	COMPRESSION SPRING
34C.	[1]	146302-3300	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]	146310-0100	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]	146234-0020	GUIDE PIN
50.	[1]	146403-4820	HYDRAULIC HEAD
50.	[1]	146403-4820	HYDRAULIC HEAD
50.	[1]	146403-4820	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]	146432-0000	COMPRESSION SPRING
58.	[4]	146440-0120	FITTING
60.	[4]	139106-0100	FLAT-HEAD SCREW
67.	[1]	146820-8220	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
67/13.	[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
67/23.	[1]	146628-9200	BRACKET
67/24.	[2]	139006-4500	BLEEDER SCREW
67/26.	[1]	146932-2900	BRACKET
67/78.	[1]	146600-4400	SEAL RING
67/98.	[1]	139006-4500	BLEEDER SCREW
67/100.	[1]	146628-9000	BRACKET
67/102.	[1]	146928-8720	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
72.	[1]	146539-6100	CONTROL LEVER
72B.	[1]	146539-6200	CONTROL LEVER
73.	[1]	014110-6440	LOCKING WASHER
75.	[1]	013020-6040	UNION NUT M6P1H5
95.	[1]	146861-4020	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]	146570-0420	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]	146575-7800	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]	146879-0320	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]	146110-0920	CONTROL VALVE
135/5.	[1]	146114-0000	SPRING WASHER
136.	[1]	146120-1520	OVER FLOW VALVE
137.	[2]	139512-0500	GASKET
138.	[1]	146665-1820	INLET UNION
160.	[2]	146625-8020	PLATE
160.	[2]	146625-8020	PLATE
205.	[1]	025804-1610	WOODRUFF KEY
206.	[1]	013121-4140	UNION NUT M14P1.5H11
207.	[1]	029321-4050	LOCKING WASHER
217.	[1]	146541-2900	SLOTTED WASHER
218.	[1]	146592-4300	COILED SPRING
219.	[1]	146541-3000	BUSHING
220.	[1]	146592-4400	COILED SPRING
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]	146615-3720	TOOTHED GEAR
270/1.	[1]	146615-2000	TOOTHED GEAR
270/2.	[1]	146615-3700	COUPLING PLATE
270/3.	[6]	020006-1870	BLEEDER SCREW M6P1L18 7T
800S.	[1]	146018-6420	PUMP HOUSING
800S/1/6.	[1]	146601-0700	PACKING RING
800S/1/6.	[1]	146601-0700	PACKING RING
804S.	[1]	146232-0320	COMPRESSION SPRING
805S.	[1]	146574-0120	PARTS SET
810S.	[1]	146600-1120	REPAIR SET
813S.	[1]	146600-3120	PARTS SET
821S.	[1]	146210-5720	ROLLER SET
835S.	[1]	146598-1000	CAP
836S/1.	[1]	146598-0600	CAP L18
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
906.	[1]	146924-3000	NAMEPLATE

Include in #2:

104746-1440 as INJECTION-PUMP ASSEMBLY

Cross reference number

BOSCH 9 460 611 694 9460611694

ZEXEL 104746-1440 1047461440

ISUZU 8971105590 8971105590

Zexel num

Bosch num

Firm num

Name

104746-1440

9 460 611 694

8971105590 ISUZU

INJECTION-PUMP ASSEMBLY
4JG2 K 11CJ INJECTION PUMP ASSY VE4 VE

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)
Left L

Injection timing adjustment

Pump speed r/min 1000 1000 1000

Average injection quantity mm3/st. 56 55.5 56.5

Difference in delivery mm3/st. 3.5

Basic *

Oil temperature degC 50 48 52

Injection timing adjustment_02

Pump speed r/min 500 500 500

Average injection quantity mm3/st. 53.7 53.7 53.7

Oil temperature degC 50 48 52

Injection timing adjustment_03

Pump speed r/min 1000 1000 1000

Average injection quantity mm3/st. 56 55 57

Difference in delivery mm3/st. 3.5

Basic *

Oil temperature degC 50 48 52

Injection timing adjustment_04

Pump speed r/min 1440 1440 1440

Average injection quantity mm3/st. 53.3 53.3 53.3

Oil temperature degC 50 48 52

Injection timing adjustment_05

Pump speed r/min 1800 1800 1800

Average injection quantity mm3/st. 54.3 54.3 54.3

Oil temperature degC 50 48 52

Injection quantity adjustment

Pump speed r/min 2300 2300 2300

Average injection quantity mm3/st. 21.8 18.8 24.8

Difference in delivery mm3/st. 5.5

Basic *

Oil temperature degC 52 50 54

Injection quantity adjustment_02

Pump speed r/min 2500 2500 2500

Average injection quantity mm3/st. 6

Oil temperature degC 55 52 58

Injection quantity adjustment_03

Pump speed r/min 2300 2300 2300

Average injection quantity mm3/st. 21.8 18.8 24.8

Difference in delivery mm3/st. 5.5

Oil temperature degC 52 50 54

Governor adjustment

Pump speed r/min 375 375 375

Average injection quantity mm3/st. 17.7 15.7 19.7

Difference in delivery mm3/st. 2

Basic *

Oil temperature degC 48 46 50

Governor adjustment_02

Pump speed r/min 375 375 375

Average injection quantity mm3/st. 17.7 15.7 19.7

Difference in delivery mm3/st. 2

Oil temperature degC 48 46 50

Timer adjustment

Pump speed r/min 100 100 100

Average injection quantity mm3/st. 80 80 120

Basic *

Oil temperature degC 48 46 50

Remarks
Full

Timer adjustment_02

Pump speed r/min 100 100 100

Average injection quantity mm3/st. 80 80 120

Oil temperature degC 48 46 50

Speed control lever angle

Pump speed r/min 375 375 375

Average injection quantity mm3/st. 0 0 0

Oil temperature degC 48 46 50

0000000901

Pump speed r/min 1000 1000 1000

Overflow quantity cm3/min 680 550 810

Oil temperature degC 50 48 52

Stop lever angle

Pump speed r/min 1000 1000 1000

Pressure kPa 402 382 422

Pressure kgf/cm2 4.1 3.9 4.3

Basic *

Oil temperature degC 50 48 52

Stop lever angle_02

Pump speed r/min 1000 1000 1000

Pressure kPa 402 373 431

Pressure kgf/cm2 4.1 3.8 4.4

Basic *

Oil temperature degC 50 48 52

0000001101

Pump speed r/min 1000 1000 1000

Timer stroke mm 3.1 2.9 3.3

Basic *

Oil temperature degC 50 48 52

_02

Pump speed r/min 500 500 500

Timer stroke mm 0.5 0.1 1.3

Oil temperature degC 48 46 50

_03

Pump speed r/min 1000 1000 1000

Timer stroke mm 3.1 2.9 3.3

Basic *

Oil temperature degC 50 48 52

_04

Pump speed r/min 1440 1440 1440

Timer stroke mm 5.3 4.9 5.7

Oil temperature degC 50 48 52

_05

Pump speed r/min 1950 1950 1950

Timer stroke mm 7.8 7.5 8.2

Oil temperature degC 50 48 52

0000001201

Max. applied voltage V 8 8 8

Test voltage V 13 12 14

0000001401

Pump speed r/min 1000 1000 1000

Average injection quantity mm3/st. 26.9 26.4 27.4

Timer stroke TA mm 2.8 2.8 2.8

Timer stroke variation dT mm 0.3 0.1 0.5

Basic *

Oil temperature degC 50 48 52

_02

Pump speed r/min 1000 1000 1000

Average injection quantity mm3/st. 26.9 25.9 27.9

Timer stroke variation dT mm 0.3 -0.1 0.7

Basic *

Oil temperature degC 50 48 52

_03

Pump speed r/min 1000 1000 1000

Average injection quantity mm3/st. 11.8 10.8 12.8

Timer stroke variation dT mm 1 0.4 1.6

Oil temperature degC 50 48 52

Timing setting

K dimension mm 3.3 3.2 3.4

KF dimension mm 5.8 5.7 5.9

MS dimension mm 0.7 0.6 0.8

Pre-stroke mm 0.1 0.08 0.12

Control lever angle alpha deg. 18 14 22

Control lever angle beta deg. 37 32 42

Information:

Overheating
Possible Causes/Corrections
Low Coolant Level/If the coolant level is too low, not enough coolant will go through the engine and radiator. This lack of coolant will not take enough heat from the engine and there will not be enough flow of coolant through the radiator to release the heat into the cooling air. Low coolant level is caused by leaks or wrong filling of the radiator. With the engine cool, be sure that coolant can be seen at the low end of the fill neck on the radiator top tank. Bad Temperature Gauge/A temperature gauge which does not work correctly will not show the correct temperature. If the temperature gauge shows that the coolant temperature is too hot but other conditions are normal, either install a gauge you know is good or check the cooling system with the 8T470 Thermistor Thermometer Group. Dirty Radiator/Check the radiator for debris between the fins of the radiator core which prevents free air flow through the radiator core. Check the radiator for debris, dirt, or deposits on the inside of the radiator core which prevents free flow of coolant through the radiator. Loose Belt(s)/Loose fan or water pump belts will cause a reduction in air or water flow. Tighten the belts according to V-BELT TENSION CHART that is shown in Specification section of this Service Manual. Bad Hose(s)/Bad hoses with leaks can normally be seen. Hoses that have no visual leaks can "collapse" (pull together) during operation and cause a restriction in the flow of coolant. Hoses become soft and / or get cracks after a period of time. Hoses must be changed after 50,000 miles or a year of use. The inside can become loose, and the loose particles of the hose can cause a restriction in the flow of coolant. Shunt Line Restriction/A restriction of the shunt line from the radiator top tank to the engine front cover, or a shunt line not installed correctly, will cause a reduction in water pump efficiency. The result will be low coolant flow and overheating. Shutters Not Opening Correctly/Check the opening temperature of the shutters. The shutters must be completely closed at a temperature below the fully open temperature of the water temperature regulators. Also, verify that fan control switches or viscous fans are operating correctly. Bad Water Temperature Regulators/A regulator that does not open, or only opens part of the way, can cause above normal heating. To test the thermostats, see the Testing and Adjusting section of this Service Manual. Bad Water Pump/A water pump with a loose impeller does not pump enough coolant for correct engine cooling. A loose impeller can be found by removing the water pump, and by pushing the shaft back and pulling it forward. If the impeller has no damage, check the impeller clearance. The clearance between the impeller and the housing is 0.56 to 1.50 mm (.022 to .059 in.). Air in Cooling System/Air can get into the cooling system in different ways. The most common causes