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Products
Cummins diesel engine injector / plunger / plunger


Detailed Description:

The physical map and parameter model are for reference only: For specific price models, please contact our sales online customer service,

Rixing Power Technology direct sales Cummins KTA19-G2, KTA19-G3, KTA19-G4, KTAA19-G6A, KTA19-G8, NTA855-G1, NTA855-G2, NTA855-G3, NTA855-G2A, NTA855-G4, NT855- GA, KTA38-G2, KTA38-G3, KTA38-G5, KTA50-G1, KTA50-G2, KTA50-G3, KTA50-G9A, KTA50-GS8, MTA11-G3, MTAA11-G3, 6CTA8.3-G2, 6CTAA8. 3G2, 6LTAA8.9G2, 6BTAA5.9G2, 6BTA5.9G2, 6BT5.9G2, 4BTA3.9G2, 4BT3.9G2, 4B3.9G2, VTA28G5, VTA28G6, QSZ13-G2, QSZ13-G3, QSK38-G5, QSL19G5, QSX15G6 QSX15G8, QSK23G3, QST30G3, QST30G4, QSK60G3, QSK60G4, QSK19G3; QSK78 Dongfeng Cummins nozzle, injector, Chongqing Cummins nozzle, injector, Cummins nozzle, injector,

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Cummins diesel engine injector types:

Flange type: rarely used now

Cylindrical:

1) Cummins top-stop injector: used in CQ30290 series cars, 250KW-800KW and other generator sets. The adjustment method is zero clearance method (small torque method).

2) Non-top Cummins injector: used in other models, adjustment method is dial indicator method (stroke method)

3) STC injector: used for M600, G4, M11 and other engines. The adjustment method is zero clearance method (small torque method).

Cummins diesel engine PT (D) injector schematic diagram:

Working process of Cummins diesel engine injector

Bypass stage: The fuel injector is in the state of stopping the fuel supply, the plunger is pressed at the lowest position, and the thin part in the middle of the plunger hooks the internal oil return path of the injector. At this time, the fuel cools the injector and removes the gas in the oil passage. The injector plunger is always in this state during the work and exhaust strokes of the engine. Metering (oil measurement) phase: When the cam continues to rotate to the intake stroke shortly after the cam profile changes, the plunger rises under the action of the spring, first cut off the inlet and return passages, and the fuel bypass ends. The metering hole starts to measure, and the fuel flows to the oil cup of the injector. At this time, due to the low oil pressure, the diameter of the injection hole is small (≈0.17mm) and will not leak oil. When the plunger is raised to the highest position, the cam profile curve remains stable, and the plunger is at the highest position until the end of the air intake. During the compression stroke, under the action of the cam curve, the plunger slowly descends until it approaches the closed metering hole, and the metering ends. Preparing for the injection phase: After the measurement is completed, the plunger descends to a certain position, a certain pressure is generated in the lower oil cup and oil passage, causing the check ball valve to fall on the ball seat, closing the oil passage, and the plunger continues to descend Separating the oil passage from the oil cup, because the engine speed is high and the measuring time is short, its oil cup will not be filled with fuel. Therefore, at this stage, only the gas in the oil cup is compressed and partially excluded in preparation for injection. Injection phase: When the compression stroke of the engine is nearing its end, the cam profile curve changes suddenly, causing the plunger to descend rapidly, and injecting the fuel in the oil cup into the cylinder at a high pressure of 1056KG / CM², while injecting, The thin part in the middle of the plunger makes the inlet and return channels communicate, the fuel starts to bypass, the plunger finally falls on the oil cup, and the fuel injection ends.

How to adjust the injector and valve clearance of Cummins diesel engine

How to adjust the nozzle and valve adjustment of each model of Cummins series engine

Dongfeng Cummins currently has 6B and 6C models.

Overall structural design features of Dongfeng Cummins 6B engine

1. Intake air pressure.

2. Design the pump casing, oil pump casing, oil cooler casing, etc. in the cylinder block or cylinder head.

3. There are no liners for the cylinder liner, valve seat, valve guide and camshaft, but there is room for inserting the liner.

4, widely used simple structure, small size accessory assembly.

The 6BT diesel engine is composed of 2 mechanisms and 4 systems, such as a crank link mechanism, a valve distribution mechanism, a supply system, a lubrication system, a cooling system, and a starting system.

The 6BT5.9 diesel engine has a total of 180 types and 760 parts.

Technical parameters of Dongfeng Cummins engine

Model: 6BT5.9

Form: 6-cylinder, inline, water-cooled, 4-stroke, exhaust turbocharged direct injection diesel engine

Bore diameter (mm): 102

Stroke (mm): 120

Displacement (L): 5.88

Compression ratio: 17.5: 1

Ignition sequence: 1-5-3-6-2-4

Valve clearance: into 0.25

Row 0.51

Turning (viewed from the front of the engine) clockwise

Assembly torque of main parts of the crank link mechanism (unit: Nm)

1.Main bearing for the first time 50

Second time 80

The third time all bolts turn 60 degrees

2.Connecting rod for the first time 55

The second time all bolts turn 60 degrees

3.Cylinder head bolts for the first time 90

Second 120 (long bolt)

The third time all bolts turn 90 degrees

Note: The main bearing and cylinder head bolts are tightened in sequence from the middle to both sides. After the assembly is completed, each part must be rotated flexibly, and the gaps meet the maintenance standards.

Valve adjustment sequence number

Cylinder number

1

2

3

4

5

6

First cylinder compression top dead center

Enter

row

Enter

row

Enter

row

Sixth cylinder compression top dead center

row

Enter

row

Enter

Enter

row

Dongfeng Cummins 6C series engines are different from 6B series engines. The cylinder liner is changed to wet cooling, and the valve seat and valve guide can be exchanged.

Technical parameters of Dongfeng Cummins engine

Model: 6BT8.3

Form: 6-cylinder, inline, water-cooled, 4-stroke, exhaust turbocharged direct injection diesel engine

Bore size (mm): 114

Stroke (mm): 120

Displacement (L): 8.3

Compression ratio

Ignition sequence: 1-5-3-6-2-4

Valve clearance: Into: 0.30

Row: 0.61

Turning (viewed from the front of the engine) clockwise

Torque of key parts of Dongfeng Cummins 6C

1.Connecting rod for the first time 40 motor 77

Second 80 Front Stand 112

Third time 120 flywheel 140

2.Cylinder head for the first time 70 Flywheel housing 77

Second time 145 (long) Rocker stand 55

Third turn 90 degree shock absorber 200

3.Main bearing for the first time 50

Second time 119

Third time 176

4.Front nut of fuel injection pump A type 92

MW type 104

P type 165

Partial data of Dongfeng Cummins 6C engine reassembly test (unit: mm)

Minimum Maximum

Main shaft diameter 97.962 98.031 Valve guide height

Connecting rod diameter 75.962 76.013 into 20.05 20.16

Out-of-roundness 0.050 Row 22.50 23.01

Taper 0.013 Concavity of the valve

Large connecting rod hole 76.046 76.104 (with tile) into 0.59 1.12

Clearance of connecting rod bearing 0.033 0.117 Row 1.09 1.62

Backlash 0.100 0.330 Piston ring gap

Main bearing hole 98.079 98.123 (with tile) top, middle 0.35 0.65

Liner 114.00 114.04 Oil 0.30 0.60

Cylinder liner protrusion 0.025 0.122

Valve adjustment sequence number

Cylinder number

1

2

3

4

5

6

First cylinder compression top dead center

Enter

row

Enter

row

Enter

row

Sixth cylinder compression top dead center

row

Enter

row

Enter

Enter

row

How to determine the top dead center of a cylinder: The usual method is to insert the engine timing pin into the hole on the camshaft gear. Make sure to insert it. Mark any place on the shock absorber and turn it 360 degrees. Top dead center on six cylinders.

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