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I have been trying to focus on getting this truck finished and fixing the engine noise so I can make my first trip to the GA rally with it this fall. I ordered a set of rod bearings and rod bolts because that's what I thought the problem was. After pulling the pan and inspecting the bearings...

Here is a video of the rockers with it running. Starting at the front of the engine. I am starting to think like jeepsinker it has a piston issue. I took a 3 foot 1x3 piece of oak and pushed down on top of all rockers while it is running and the sound did not change. http://youtu.be/NJKMYMFm0Uk

The noise may not have anything to do with the oil pressure ,but there does seem to be a delay in the noise on a cold start.

Would it run or damage something running without a valve opening and closing? if not it would be worth a try.

I started it cold and it has a little blow by I could not see it if I put my hand over the end I can feel it. When it is warm/hot I can see the blow by. I don't know what is normal or excessive. I does not seem excessive to me ,but I have only been playing with big diesels for a few years...

I have listened to each injector they all have a different sound, but I could not relate it to the engine knock.I have also cracked the line at each injector while running and the noise never changed but the engine ran rough with each one I cracked loose. Now I hate to even mention this because...

I have held them also took a piece of wood and pushed down on the top of the rocker while running. There was no change in the noise. I agree that is what it sounds like and I a hope it is something that easy.

It sounds like it is comming from the back of the engine last three cylinders. The video sounds different than when you are standing by it. It does sound somewhat normal on the video. Here is another one from under the truck. Maybe I am being paranoid I just do not want to damage the engine...

I have what sounds like an upper engine noise, but I am not sure. It is a 1983 Air Force M35A2C That has not had the truck or engine rebuilt as far as I can tell. It shows 11500 miles and 375 hours I don't know if this is actual or not. To give you the history that I know I bought this truck...