So the history is that I bought it with a siezed engine, the #1 valves fell into the #1 cylinder. Installed remanufactured head from Cummins with new piston. Cylinder wall looked good so did a light hone and installed a new piston/rings. Put new Edge Jammer nozzles on the injectors.

Got it running and it ran great for 30km, then while sitting at a light it started knocking just out of the blue.

Listening with a stethescope its loudest on cylinder #6 which is weird cause all the damage was in #1. Also its loudest with the probe on the injector. I swapped #3 and #6 injectors and noise stayed at #6, ao I'm guessing its not injector unless it had two bad injectors.

I find it weird that:

1) it started so long after firing the engine up(engine was started and stopped 3 times in that 30km), and it just started, didn't start softly then get louder, just started
2)its loudest on the injector
3)its in hole #6

My gut says bottom end but I'd hate to tear it down find nothing wrong and then find some bad injectors.

At the very least its neat to see it running with the cover off.

 

Oh yeah: Picks up with RPM but doesn't really get louder with a load on it, almost disappears on coast.

 

Just a thought but have you checked the valve lash?

 

Maybe the push rods from #1 were bent or damaged and they are now located in #6. Just a thought.

 

I rechecked the valves and the pushrods on number one were bent and replaced with new, sorry forgot to mention that.

 

sounds like you may have a burnt piston. if you have someone with a bore scope and pull the injector and take a look at the cylinder walls. just thought of something else.... hows the blow by? didn't see much in the video. you could also take an oil sample and see if it comes back with high levels of bearing materal. may have to just pull the head and check it out too.

 

Shut down each cylinder one by one. Of you do not have a drb3 or access to one. Disconnect each injector by capping the fuel line to each injector. I would tell you to remove the wire leads to each injector BUT the 03 trucks read TDC fron the cam and crank senor and send the ignition signal to #1 injector. If #1 injector is disconnected it will not start.

Check all your fuel lines from the rail to the injectors. I would have to say your motor sounds like a bad injector or piston. Hopefuly it is just a bad injector with no engine damage. Let us know what you find.

Richard

 

Could he start from #6 and work his way to #1?? Will this work??

 

Sounds like mine when I had a valve tapping the piston, and the sound did go away w/ higher rpms.

 

x2... just had mine fixed. Has it gotten hot lately?

 

I would just cap the rail...especially on the 03-04 trucks.

 

It did before the new head went on.....

 

MMMM thats not true for this truck as I had it running with the #1 wires off.

 

What do you need to cap the rail? Is it just a regular JIC fitting?

 

I can see the noise is going twice as fast as the valves = piston related