This is the part 2 of fuel injector overhaul series, overhauling and testing of fuel injector.

這是噴油器檢修系列的第二部分，即噴油器的檢修和測試。

Take out the injector and place it on the vise.

取出噴油器，放在臺鉗上。

Open the cap nut.

打開蓋帽螺母。

Open the locking nut.

打開鎖緊螺母。

Loosen the adjusting screw.

鬆開調節螺釘。

Now loosen the retaining nut.

現在鬆開固定螺母。

Be careful that if the retaining nut is opened without releasing the pressure on adjusting screw, the nozzle may get damaged.

請注意，如果在未釋放調節螺釘壓力的情況下打開固定螺母，可能會損壞噴嘴。

Take out the retaining nut together with the atomizing nozzle.

取出固定螺母和霧化噴嘴。

The atomizing needle valve may come loose.

霧化針閥可能鬆動。

Be careful not to let it fall down.

小心別讓它掉下來。

Push out the nozzle from the retaining nut.

將噴嘴從固定螺母中推出。

Take out the double pins, adjusting screw, spring, spring retainer, pushrod and the o-rings.

取出雙銷、調節螺釘、彈簧、彈簧固定器、推杆和 O 形圈。

Thoroughly clean all the parts.

徹底清潔所有部件。

The nozzle and needle valve comes as a pair.

噴嘴和針閥是一對。

Never interchange them with another one.

切勿將它們與另一個互換。

Always recommended to use a new nozzle rather than using a corrected bad nozzle by lapping.

始終建議使用新噴嘴，而不是通過研磨使用已校正的壞噴嘴。

The nozzle should be changed with a new one after its service life.

噴嘴使用年限到期後應更換新噴嘴。

In case reusing the nozzle, do lapping with a thin lapping paste.

如果重複使用噴嘴，請使用稀薄的研磨膏進行研磨。

Never do lapping of the nozzle needle valve.

切勿研磨噴嘴針閥。

Attempt to lap the nozzle needle valve will deteriorate the condition of sealing faces.

試圖搭接噴嘴針閥會使密封面狀況惡化。

At most care should be taken not to damage the sealing faces.

最多應注意不要損壞密封面。

Check the length of the spring with a new one.

用新彈簧檢查彈簧的長度。

If it is less than the new one, discard it.

如果小於新值，則棄之。

Insert and pull out the needle valve to check its movement.

插入並拉出針閥，檢查其動作。

Is the movement smooth?

動作是否流暢？

Is the movement not too free?

動作是不是太自由了？

If it is too free, discard the nozzle.

如果太自由，請丟棄噴嘴。

The oil passage is shown in the red line.

紅線所示為油道。

When the fuel pump pumps the fuel oil at high pressure to the injector, it pushes the needle valve of the atomizing nozzle backwards against the spring force and sprays the fuel oil.

當燃油泵將燃油以高壓泵送至噴油器時，它在彈簧力的作用下將霧化噴嘴的針閥向後推，噴出燃油。

Oil goes inside through this hole.

機油通過這個孔進入內部。

It's the sealing face of the needle valve.

這是針閥的密封面。

Now we will assemble back the fuel injector.

現在，我們將組裝回噴油器。

Install the pushrod, spring and the spring retainer.

安裝推杆、彈簧和彈簧固定器。

Install the adjusting screw.

安裝調節螺釘。

After that, install the dowel pin, then the nozzle and the nozzle retaining nut.

然後，安裝銷釘，再安裝噴嘴和噴嘴固定螺母。

Tighten the nozzle retaining nut to the torque specified in the manual.

按照手冊規定的扭矩擰緊噴嘴固定螺母。

If the retaining nut is tightened with too much torque, the needle valve of the nozzle may stuck.

如果擰緊固定螺母時扭矩過大，可能會卡住噴嘴針閥。

So tighten it with care.

是以要小心擰緊。

Checking of the valve opening pressure.

檢查閥門開啟壓力。

The oil used for testing should be clean diesel oil only.

測試用油只能是清潔機油。

Keep the valve on the test bench.

將閥門放在測試臺上。

Connect the test pump and fuel injector by means of high pressure hose.

用高壓軟管連接測試泵和噴油器。

Avoid approaching your hand near to the nozzle tip while test is performing.

測試時避免將手靠近噴嘴尖端。

If hit by jet, it will cause injury.

如果被射流擊中，會造成傷害。

Quickly move the lever of test pump to bleed air until the pointer of the pressure gauge begins to move and air is ejected.

快速移動測試泵的槓桿放氣，直到壓力錶指針開始移動並排出空氣。

Slowly move the lever about once a second and read the pressure at which injection start.

每秒緩慢移動控制桿一次，讀取開始噴射時的壓力。

Adjustment of injector opening pressure.

調整噴油器開啟壓力。

Turning in the adjusting screw is increasing the opening pressure and turning out the adjusting screw is decreasing the opening pressure.

旋入調節螺釘是增加開啟壓力，旋出調節螺釘是減小開啟壓力。

Slowly increase the pressure.

慢慢增加壓力。

Now the opening pressure has reached to 420 bar, which is the pressure specified in the manual.

現在開啟壓力已達到 420 巴，這是手冊中規定的壓力。

Install and tighten the locking nut paying attention that the adjusting screw should not move.

安裝並擰緊鎖緊螺母，注意調節螺釘不得移動。

Tighten the cap nut.

擰緊蓋帽螺母。

Again test the opening pressure to confirm that the set pressure has not changed.

再次測試開啟壓力，確認設定壓力沒有變化。

Now we will do the checking of injection characteristics.

現在我們將檢查噴射特性。

That include checking of clogging of the nozzle, faulty movement of the needle valve and drips of fuel oil.

這包括檢查噴嘴是否堵塞、針閥的移動是否有問題以及燃油是否滴漏。

Look to confirm that the injection is uniform and fine.

查看並確認注射是否均勻、精細。

Listen for sound of injection to confirm whether it is sharp.

傾聽注射的聲音，以確認是否尖銳。

Check for any sudden fall in pressure after pumping has been stopped.

檢查泵停止後壓力是否突然下降。

Doing a injection test on a white paper to see that it is normal and uniform.

在白紙上進行注射測試，看其是否正常、均勻。

Confirm there is no leak on the injector nozzle tip.

確認噴油器噴嘴頭沒有洩漏。

Now slowly release the pressure from the high pressure hose.

現在慢慢釋放高壓軟管的壓力。

Take out the injector from the test bed and keep on the stand.

從試驗檯上取出噴射器，放在支架上。

Wrap the injector in such a way to protect the nozzle and fuel inlet area from dust and dirt.

包裹噴油器時要注意保護噴嘴和燃油入口區域，防止灰塵和汙垢進入。