104740-1582 ZEXEL 9 460 613 566 BOSCH INJECTION-PUMP ASSEMBLY 9460613566 1047401582 8943142431

Information Cross number Calibration Data Calibration Data Ex

Information injection-pump assembly

BOSCH 9 460 613 566 9460613566

ZEXEL 104740-1582 1047401582

ISUZU 8943142431 8943142431

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Buy INJECTION-PUMP ASSEMBLY 104740-1582 zexel genuine, new aftermarket engine parts with delivery

Components :

0.	INJECTION-PUMP ASSEMBLY	104740-1582
1.	_
2.	FUEL INJECTION PUMP	104640-1331
3.	NUMBER PLATE	146907-8800
4.	_
5.	CAPSULE	146620-0120
6.	ADJUSTING DEVICE
7.	NOZZLE AND HOLDER ASSY	105158-2193
8.	Nozzle and Holder	8-94449-079-0
9.	Open Pre:MPa(Kqf/cm2)	13.2{135}
10.	NOZZLE-HOLDER	105088-1090
11.	NOZZLE	105007-1100

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]	146210-1720	ROLLER SET
24.	[1]	146303-0100	BEARING PIN
25.	[1]	146304-0000	BEARING PIN
26.	[1]	146305-0000	CLAMPING BAND
27.	[1]	146205-0000	SLOTTED WASHER
29.	[1]	146220-0020	CAM PLATE
30.	[1]	146600-0800	O-RING
31.	[1]	146300-0400	PUMP PLUNGER
32.	[1]	146301-0000	SLIDING PIECE
33.	[1]	146603-0700	SHIM D17.5&7.5T0.60
34.	[1]	146302-3500	COMPRESSION SPRING
34B.	[1]	146302-3600	COMPRESSION SPRING
34C.	[1]	146302-3700	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 D17&5.2T2.1
48/1.	[1]	146690-5900	SHIM D17&5.2T2.2
48/1.	[1]	146690-6000	SHIM D17&5.2T2.3
48/1.	[1]	146690-6100	SHIM D17&5.2T2.4
48/1.	[1]	146690-6200	SHIM D17&5.2T2.5
48/1.	[1]	146690-6300	SHIM D17&5.2T2.6
48/1.	[1]	146690-6400	SHIM D17&5.2T2.7
48/1.	[1]	146690-6500	SHIM D17&5.2T2.8
48/1.	[1]	146690-6600	SHIM D17&5.2T2.9
48/1.	[1]	146690-6700	SHIM D17&5.2T3.0
48/1.	[1]	146690-6800	SHIM D17&5.2T3.1
48/1.	[1]	146690-6900	SHIM D17&5.2T3.2
48/1.	[1]	146690-7000	SHIM D17&5.2T3.3
48/1.	[1]	146690-7100	SHIM D17&5.2T3.4
48/1.	[1]	146690-7200	SHIM D17&5.2T0.4
48/1.	[1]	146690-7300	SHIM D17&5.2T0.6
48/1.	[1]	146690-7400	SHIM D17&5.2T0.7
48/1.	[1]	146690-7500	SHIM D17&5.2T1.9
48/1.	[1]	146690-7800	SHIM D17&5.2T0.2
49.	[2]	146234-0500	GUIDE PIN
50.	[1]	146401-2020	HYDRAULIC HEAD
50.	[1]	146401-2020	HYDRAULIC HEAD
50.	[1]	146401-2020	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]	146430-0120	DELIVERY-VALVE ASSEMBLY
56.	[4]	146432-0000	COMPRESSION SPRING
58.	[4]	146440-0120	FITTING
60.	[4]	139106-0100	FLAT-HEAD SCREW
67.	[1]	146501-1721	GOVERNOR COVER
67/1.	[1]	146505-2021	GOVERNOR COVER
67/2.	[1]	146515-2520	CONTROL SHAFT
67/3.	[1]	146600-0100	O-RING
67/4.	[1]	139310-0200	PLAIN WASHER
67/5.	[1]	146537-6600	CONTROL LEVER
67/5B.	[1]	146537-6700	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]	146587-1100	COILED SPRING
67/23.	[1]	146613-1300	BRACKET
67/24.	[2]	139006-4700	BLEEDER SCREW
67/78.	[1]	146600-4400	SEAL RING
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]	146551-8220	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]	146975-8400	SLIDING SLEEVE
116.	[1]	146576-0000	SEALING 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]	146579-0820	RETAINING PIN
122.	[1]	146580-2000	GOVERNOR SPRING
123.	[4]	139106-0200	FLAT-HEAD SCREW
130.	[1]	146421-0020	CAPSULE
130/2.	[1]	026508-1140	GASKET D11.4&8.2T1
130/3.	[1]	146422-0000	BLEEDER SCREW
130/4.	[1]	146600-0500	O-RING
133.	[1]	146600-0600	O-RING
134.	[1]	146600-0700	O-RING
135.	[1]	146110-0220	CONTROL VALVE
135/5.	[1]	146114-0000	SPRING WASHER
136.	[1]	146120-0020	OVER FLOW VALVE
137.	[2]	139512-0500	GASKET
138.	[1]	146610-5920	INLET UNION
200.	[1]	146206-0100	COILED SPRING
205.	[1]	029470-4030	WOODRUFF KEY
225.	[1]	146929-2620	BRACKET
240.	[1]	146650-1220	PULLING ELECTROMAGNET
240/8.	[1]	146600-1700	O-RING
242.	[1]	146658-5120	WIRE
243.	[1]	146621-1000	UNION NUT
245.	[3]	139512-0500	GASKET
246.	[1]	146125-0000	EYE BOLT
247.	[1]	146606-6620	INLET UNION
248.	[1]	146614-0200	SPACER BUSHING
275.	[1]	146612-0120	BRACKET
276.	[2]	010010-1888	BLEEDER SCREW
800S.	[1]	146019-6920	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
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]	146620-0120	CAPSULE
903/2.	[1]	146600-1300	O-RING &13W1.9
906.	[1]	146907-8800	NAMEPLATE

Include in #2:

104740-1582 as INJECTION-PUMP ASSEMBLY

Cross reference number

BOSCH 9 460 613 566 9460613566

ZEXEL 104740-1582 1047401582

ISUZU 8943142431 8943142431

Zexel num

Bosch num

Firm num

Name

104740-1582
104740-1840

9 460 613 566

8943142431 ISUZU

INJECTION-PUMP ASSEMBLY
4FG1 * K 11CJ VE4 VE

Calibration Data:

Adjustment conditions

Test oil
1404 Test oil ISO4113orSAEJ967d

Test oil temperature degC 45 45 50

Nozzle 105000-2010

Bosch type code NP-DN12SD12TT

Nozzle holder 105780-2080

Opening pressure MPa 14.7 14.7 15.19

Opening pressure kgf/cm2 150 150 155

Injection pipe
Inside diameter - outside diameter - length (mm) mm 2-6-840

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

Injection timing adjustment

Pump speed r/min 1250 1250 1250

Average injection quantity mm3/st. 47.6 47.1 48.1

Difference in delivery mm3/st. 3.5

Basic *

Injection timing adjustment_02

Pump speed r/min 2500 2500 2500

Average injection quantity mm3/st. 14 10.5 17.5

Injection timing adjustment_03

Pump speed r/min 2150 2150 2150

Average injection quantity mm3/st. 39 36.5 41.5

Injection timing adjustment_04

Pump speed r/min 1250 1250 1250

Average injection quantity mm3/st. 47.6 46.6 48.6

Injection timing adjustment_05

Pump speed r/min 600 600 600

Average injection quantity mm3/st. 47.1 44.6 49.6

Injection quantity adjustment

Pump speed r/min 2500 2500 2500

Average injection quantity mm3/st. 14 11 17

Difference in delivery mm3/st. 4.5

Basic *

Injection quantity adjustment_02

Pump speed r/min 2850 2850 2850

Average injection quantity mm3/st. 5

Governor adjustment

Pump speed r/min 350 350 350

Average injection quantity mm3/st. 10.3 8.3 12.3

Difference in delivery mm3/st. 2

Basic *

Governor adjustment_02

Pump speed r/min 350 350 350

Average injection quantity mm3/st. 10.3 8.3 12.3

Governor adjustment_03

Pump speed r/min 425 425 425

Average injection quantity mm3/st. 3

Timer adjustment

Pump speed r/min 100 100 100

Average injection quantity mm3/st. 60 50 70

Basic *

Speed control lever angle

Pump speed r/min 350 350 350

Average injection quantity mm3/st. 0 0 0

Remarks
Magnet OFF

0000000901

Pump speed r/min 1250 1250 1250

Overflow quantity cm3/min 420 288 552

Stop lever angle

Pump speed r/min 1750 1750 1750

Pressure kPa 588.5 569 608

Pressure kgf/cm2 6 5.8 6.2

Basic *

Stop lever angle_02

Pump speed r/min 1750 1750 1750

Pressure kPa 588.5 569 608

Pressure kgf/cm2 6 5.8 6.2

Stop lever angle_03

Pump speed r/min 2150 2150 2150

Pressure kPa 666.5 637 696

Pressure kgf/cm2 6.8 6.5 7.1

0000001101

Pump speed r/min 1750 1750 1750

Timer stroke mm 4.2 4 4.4

Basic *

_02

Pump speed r/min 1250 1250 1250

Timer stroke mm 2 1.6 2.4

_03

Pump speed r/min 1750 1750 1750

Timer stroke mm 4.2 3.9 4.5

_04

Pump speed r/min 2150 2150 2150

Timer stroke mm 5.9 5.4 6.4

0000001201

Max. applied voltage V 8 8 8

Test voltage V 13 12 14

0000001401

Pump speed r/min 1750 1750 1750

Average injection quantity mm3/st. 32.5 32 33

Timer stroke variation dT mm 0.8 0.6 1

Basic *

_02

Pump speed r/min 1750 1750 1750

Average injection quantity mm3/st. 32.5 31.5 33.5

Timer stroke variation dT mm 0.8 0.5 1.1

_03

Pump speed r/min 1750 1750 1750

Average injection quantity mm3/st. 23.5 22 25

Timer stroke variation dT mm 1.6 1.1 2.1

Timing setting

K dimension mm 3.3 3.2 3.4

KF dimension mm 5.8 5.7 5.9

MS dimension mm 0.9 0.8 1

Pre-stroke mm 0.2 0.18 0.22

Control lever angle alpha deg. -2 -6 2

Control lever angle beta deg. 42 37 47

Information:

Above Normal Heating
Recommended Procedure
1. 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.2. 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 8T0470 Thermistor Thermometer Group.3. 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.4. Loose Belt(s) ... Loose fan belts will cause a reduction in air flow. Tighten the belts according to V-Belt Tension Chart that is shown in Specification section of this Service Manual.5. 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 of a hose can deterioriate, and the loose particles of the hose can cause a restriction in the flow of coolant.6. Shunt Line Restriction ... A restriction of the shunt line from the radiator top tank to the engine water pump inlet, or a shunt line not installed correctly, will cause a reduction in water pump efficiency. The result will be low coolant flow and overheating.7. 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.8. Bad Water Temperature Regulator(s) ... 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.9. Bad Water Pump ... A water pump with a loose or damaged impeller does not pump enough coolant for correct engine cooling. Remove the water pump and check for damage to the impeller. If the impeller has no damage, check the impeller clearance. The clearance between the impeller and the housing is 0.28 to 0.84 mm (.011 to .033 in).10. Air in Cooling System ... Air can get into the cooling system in different ways. The most common causes