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Inspection and adjustment of Mitsubishi S12 diesel engine injector


Detailed Description:

Dismantling and Overhauling of Mitsubishi S12 Diesel Engine Injector

Before dismantling, pay attention to the current status of each part of the Mitsubishi S12 diesel engine, which will help analyze the cause of the failure and improve the efficiency of maintenance operations.

I would like to confirm the items required in each item according to the inspection content and purpose.

的 Detection of fuel injection start pressure

状态 Spray condition detection of Mitsubishi S12 diesel engine injector

Dismantling and Overhaul of Fuel Injector for Mitsubishi S12 Diesel Engine

Disintegration order

1 Set screws, sealing washers

2 Cap nuts, gaskets

3 adjustment screw

4 O-ring

5 Tube nut

6 Injector

7 Seat

8 Ejector rod, Mitsubishi S12 diesel engine injector spring, spring seat

9 O-ring

10 Mitsubishi S12 diesel engine injector body

Note: The fuel injector, seat ring and Mitsubishi S12 diesel engine injector spring are completely replaced.

2.3 Detection and adjustment of Mitsubishi S12 diesel engine injector

2.3.1 Detection and adjustment of fuel injection starting pressure

(1) Install the Mitsubishi S12 diesel engine injector on the Mitsubishi S12 diesel engine injector test bench.

(2) Press the handle down at about 1 time per second to detect the starting pressure of the fuel injection. Adjust when not within the standard value range.

(3) When adjusting the injection pressure, first remove the set screw of the Mitsubishi S12 diesel engine injector, loosen the cap nut, and use a screwdriver to rotate the adjustment screw.

(4) After the adjustment is completed, tighten the cover nut and set screw with the specified torque.

(5) After tightening the set screw, check whether the injection start pressure is within the standard value range again.

Test items

Nominal value

standard value

Fuel injection start pressure

34.32 MPa {350 kgf / cm2}

34.32 to 34.81 MPa {350 to 355 kgf / cm2} (value at the time of new product)

2.3.2 Mitsubishi S12 Diesel Engine Injector Spray Status Detection

While adjusting the pressure on the test bench of the Mitsubishi S12 diesel engine injector, check the nozzle clogging, spray status, and whether there is any oil leakage in the nozzle. When the spray is bad, clean or replace the nozzle.

The atomization detection items are as follows.

Shot straight.

No large particles, fine spray.

No oil drips after spraying.

2.3.3 Injector cleaning and replacement

(a) Do not hit the end of the injector.

(b) Needle valve and valve body are ultra-precision machined parts. Pay attention to storage, and never change the combination during installation.

(1) Remove the sleeve nut.

(2) Remove the injector.

(3) Clean the needle valve and valve body of the fuel injection nozzle.

Use clean cleaning oil and assemble the needle valve and valve body in clean diesel after cleaning.

(4) The sleeve nut of the fuel injector shall be tightened according to the specified torque.

(5) If the spray state does not improve after adjustment and cleaning, replace the fuel injector with a new one. The new fuel injector is coated with rust inhibitor, and it must be cleaned with cleaning oil at first, and then cleaned with diesel oil before assembly.

2.3.4 Measure the inclination, free length, and top-bottom parallelism of the injector spring of Mitsubishi S12 diesel engine

Measure the inclination, free length, and top-bottom parallelism of the Mitsubishi S12 diesel engine injector spring.

Note: When replacing the injector, replace the seat ring and the injector spring of the Mitsubishi S12 diesel engine.

2.3.5 Testing ejector

Visual inspection of the ejector pin found that the spring seat was worn on one side, the needle valve contact surface was significantly worn, or the ejector rod was replaced with a new one when cavitation of the cone below.

2.3.6 Checking the race

Visually inspect the seat ring and replace it with a new seat ring if the needle valve contact surface or high-pressure sealing surface is noticeably worn.

Note: When replacing the injector, replace the seat ring and the injector spring of the Mitsubishi S12 diesel engine.

2.4 Assembly of Mitsubishi S12 Diesel Engine Injector

Assembly of Mitsubishi S12 Diesel Engine Injector

The sleeve nut must be tightened to the specified torque. Excessive tightening will affect the operation of the needle valve and cause malfunctions such as deterioration of exhaust gas or stuck needle valve.

Note: When assembling the injector and Mitsubishi S12 diesel engine injector, the positioning pin of the injector should be aligned with the pin hole of the Mitsubishi S12 diesel engine injector.

Assembly of Mitsubishi S12 Diesel Engine Injector

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