Truck Repair: n14, feeler gauge, n14 cummins

Question
QUESTION: sir good day i woul to ask about how to adjust the valve and injectors of n14 cummins thanks

ANSWER: The basic rule is to check the engine data plate for information on the type of injector adjustment as well as the valve inlet and exhaust valve lash values.
Generally, the following steps are instructive:
1. Confirm injector travel and valve lash values for the engine you want to set.
2. Confirm the timing pointer on the front gear housing and the timing marks on the accessory drive pulley. There is A. 1-6vs; B. 2-5vs; and C. 3-4vs.
3. Turn the engine in the dorection of rotation until a timing mark aligns with the timing pointer. Check the valves on the 2 cylinders under reference and confirm the one with both intake and exhaust valves closed. You will set the valves on this cylinder. select the appropriate feeler gauge and adjust. It is better to use a 6in. torquemeter to ensure evenness. lock the locknut to 35lb-ft torque.
4.Depending on the injector type, you will adjust the injector either on the same cylinder or another cylinder as may be specified by the manufacturer. Torque the capscrews locknut to 35lb ft ensuring that the capscrew does not change from the set position.
5. Move on by turning the engine in the direction of rotation to the next timing mark.

Good luck.

---------- FOLLOW-UP ----------

QUESTION: sir i was confused because i saw one mechanic adjusting injector of n14 he used a piece of metal and inserted it to injector hole, then he eventually adjust the injector clearance can you clarify that one for me sir?this engine is mechanical type not celect type

ANSWER: That was an STC injector. The setting is different from the other injector types.
It is a zero lash setting ensuring that the injector is not unduly preloaded during setting to affect its function.
in this type, the injector and valve are not set on the same cylinder. it is arranged thus: A set Injector 3 valve 5: B inj. 6 valve 3; C inj.2 valve 6; A inj. 4 valve 2; B inj. 1 valve 4; and C inj. 5 valve 1.

You need an STC adjusting tool P/N3823348 or in the absence of this you can use the round end of a circlip plier to have the same effect. It is inserted in the tappet hole of the injector being set to hold it up during adjustment to prevent preloading. You will apply thumb pressure on the tool to keep the injector from being preloaded.
You need to also know that you need a 6in. lb torque wrench to lash the adjusting screw on the injector rocker lever as well as torquing the locknut to 50 lb ft torque.

Pls. contact N14 manual or the nearest cummins shop for more deatils.

Regards,

---------- FOLLOW-UP ----------

QUESTION: sir day!we have stc engine namely ntc350 ntc300 in our shop,drivers are complaining for loss of power may i ask you what would be the solution for that sir,is it the injector or the pt pump are deffectived?and the color of exhaust smoke were white,then other were black,and the other one also was producing white smoke when driver was quickly deccelarating the engine

Answer
Jade,
sorry for taking this long to answer your question. Obviously engine smoke is an indicator of the health of the engine. It is basically known that black smoke is an indication of too much fuel and not enough air; blue smoke in most cases is attributed to burning of engine oil in the combustion space; while white may indicate injection timing advance/retard as well as water in engine problems.
To determine correctly low power on an engine it is important that normal scheduled service/maintenance are carried out; periodical checks B,C, and D as recommended by Cummins are followed;  and when due, engine should be overhauled.
You need to sort out from the vehicle log sheet the status of each engine that is having this problem and remedy as required.

Regards,