[kalas]

Hello everyone, I'm new here on forum and I need your help.
I have a Cummins N14 that knock at 1450 -1500 rpm. At the last service, they have completely overhauled the engine, replaced one injector, replaced the camshaft on the valve train, clearance checked the timing gears (all within specs), new head. Still have the same exact noise as before and the men from service said they found no damage in pistons, pins, cannot figure it out.

Somebody told me to use a dish tool to cut out injectors,and if i need to isolate the cylinder that has the knock, it sounds like an injector causing the issue once I can isolate swap the suspected cut injector with another cylinder, all injectors should be changed at time of overhauls. Or I'll risk damage to the overhauls engine. I know that an injector only has a life span of 500,000 miles.

Do you think is too difficult? What you recomend me, to buy the service manual for my truck [TradeBit.Com] and to save money by repairing it myself, or you recommend me to go on a proffesional service and to solve this problem.

Thank you for your attention!

 

[bent]

Hello everyone, I'm new here on forum and I need your help.
I have a Cummins N14 that knock at 1450 -1500 rpm. At the last service, they have completely overhauled the engine, replaced one injector, replaced the camshaft on the valve train, clearance checked the timing gears (all within specs), new head. Still have the same exact noise as before and the men from service said they found no damage in pistons, pins, cannot figure it out.

Somebody told me to use a dish tool to cut out injectors,and if i need to isolate the cylinder that has the knock, it sounds like an injector causing the issue once I can isolate swap the suspected cut injector with another cylinder, all injectors should be changed at time of overhauls. Or I'll risk damage to the overhauls engine. I know that an injector only has a life span of 500,000 miles.

Do you think is too difficult? What you recomend me, to buy the service manual for my truck [spam] and to save money by repairing it myself, or you recommend me to go on a proffesional service and to solve this problem.

Thank you for your attention!

I wonder if the fellow really has a problem, or is this really good spam for trade bit? The OP is a non native English speaker, but he is pretty good.

 

[lanwickum]

I have an N14 red top in a truck, 500hp. Has always had a knock at those rpms. I have the cummins software to do injector cutouts and such. All the cylinders run very even. Rough running engine. I have had to turn it off on scales to get a weight. I also do oil samples and they always come back good. I will just keep on running her.

 

[CRToney]

When I rebuilt my N14 Cummins sent the wrong cam. Truck didn't run right so my mechanic double checked part number and go them to send the right one. Runs very well now.

 

[scott]

You have something wrong with rebuild, were injectors replaced? could be a bad one was overhead set correct? agree with cam and cam rocker boxes, was cam set using Cummins cam tool??? is this a mechanical motor or electronic?? N-14 engines don't rattle if done correctly, Scott.

 

[keldifornia]

That engine is 40,000 dollars from Cummings -

I'd park it till u get it solved, a hole in the block is hard to rebuild