The Siberian Patrol is down :( Please help!

[SiberianPatrol]

Mates,

After returning from a 1300+km round trip on our winter roads, my engine has started detonating (I think) pretty severely.

The day after I returned (and the Patrol ran perfectly on the trip), we had a cold -30C morning and I had trouble starting it. After getting it warmed and started I took off to run some errands and not more than 2 stops later and 10 min of runtime, the engine started detonating and grew progressively worse to the point that I couldn't drive it.

I parked it and after consulting with a mechanic here, I loosened in turn each fuel supply line at the injectors and started it to see if I could isolate which cylinder and injector was the problem. Nothing conclusive as the sound still remained through each step, although maybe slightly dampened when loosening the #4 and #3 fuel lines.



What the engine sounded like.

Sent the results to my mechanic friend (in the city - I am in the village without a diesel mechanic here), and he was still certain it was fuel injector related, so I pulled all the injectors for a closer look. Found a considerable amount of carbon deposits on the tips of the #3 and #1 injectors and in the combustion chamber so it appeared that those 2 injectors were overfueling and causing detonation.


So I bought all new injectors and sent the old ones off to be rebuilt. Yesterday I installed the new injectors, hooked everything back up and started the engine and...nothing changed. Still detonating even with all new Bosch injectors. Here is another video clip of the engine sound yesterday. Obviously nothing has changed. Could only get one video to upload, so look at the first one. Sound hasn't changed.


I am now at a loss. I am considering pulling the fuel lines at the filter and running a can of diesel flush through the system if I can find some up here, or buying some fresh fuel and doing the same thing to see if a clean fuel source will make a difference.

Other than this, I am completely lost. I am open for any and all suggestions. Does this sound like a detonation problem or does it sound more serious?

And just for the record again, I have a 1999 GR RD28T with a mechanical IP and a completely rebuilt engine 1 year ago and less than 30k km on the rebuild.


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