How to Install and Inspect 9308-618C Control Valve

How to Install and Inspect 9308-618C Control Valve

Ⅰ. 9308-618C Control Valve Introduction

9308-618C Control Valve is one of the main working parts of the fuel injector. It is responsible for injecting fuel into the combustion chamber and is a key component to achieve precise injection, oil mist formation, etc.

. How to Install 9308-618C Control Valve 

  • Before install the orifice plate, clean it in an ultrasonic cleaning machine for 3-5 minutes so that to make the dirt, anti-rust oil oxide, paraffin base, naphthenic base, intermediate base, salt, lead naphthenate, zinc naphthenate, sodium petroleum sulfonate, barium petroleum sulfonate, calcium petroleum sulfonate, tallow diamine trioleate and rosin amine shedding fall off.

  • Use compressed air to clean up the cleaning fluid attached to the surface of the cleaned orifice plate to meet the use standard.

  • Place the injector solenoid valve into the injector house, see as Pic No.1

Pic No.1

  • Put the solenoid valve spring adjustment shim into solenoid valve, see as Pic No.2

Pic No.2

  • Put the solenoid valve spring into the solenoid valve, see as Pic No.3

Pic No.3

  • Put the control valve coreinto the control valve, see as Pic No.4

Pic No.4

  • Use theinjector stroke measuring tool (CRT220) to measure whether the gap between the control valve and the armature is in the range of 30~70μm, see as Pic No.5

Pic No.5

  • Install the control valve in the injector house, see as Pic No.6

Pic No.6

  • Install the injector nozzle spacer on the control valve, see as Pic No.7

Pic No.7

  • Put in the nozzle needle valve spring, see as Pic No.8

Pic No.8

  • Put the nozzle needle valve into the nozzle, see as Pic No.9

Pic No.9

  • Install the nozzle on the injector, see as Pic No.10

Pic No.10

  • Install the injectornozzle cap on the injector with a torque wrench (CRT084), torque is within 40-45Nm, see as Pic No.11

Pic No.11

  • After installation, use a multi-meter (RTK199) to measure whether the resistance range of the injector solenoid valve is within (0.155Ω–0.190Ω), see as Pic No.12

Pic No.12

  • Insulation test. Test whether the injector is insulated from the shell, use (500v, 10M or highervoltage) for testing, see as Pic No.13

Pic No.13


Test Result

The oil return is not sealed:Leakage between control valve and armature.

May Lead To: 

Leaky oil return may lead to large oil return volume, the nozzle oil leakage and can not build up pressure, which cause to injector failure working.


Check the control valve’s sealing condition or change control valve.

. 9308-618C Control Valve Inspection

  • Check and see if there is fray on the sealing surface of control valve and the control valve core.


Pic No. 14

  • Check whether the armature stroke (CRT220) of the control valve is within the range of 30~70μm. The lift of the armature will affect the fuel injection quantity at each point. The greater the armature lift, the greater the fuel injection volume, if the armature stroke  is out of range, please replace control valve in time.

Pic No. 15

. FAQs

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