Big Cam Cummins timing question

Hello all! I'm working on a Cummins Big Cam 400 CPL 310. This engine has the wrong injectors in it, and who knows what timing. I'm looking to put the proper injectors back into it and set the timing to factory spec, but the tag is missing and I am unable to finding the proper timing code. Any help would be greatly appreciated! Thank you!

 

Engine serial number for the original engine was 10737877. For some history, the engine currently in this rig is not the original engine and that is not the serial number of the one currently in it, but it does have the correct 14.5 to 1 compression ratio pistons and proper camshaft for the 310 CPL. The injection pump is the original pump and is built to the 310 CPL specifications. The original engine is long gone so I do not have the original tag to get the timing code off of. The engine currently has NTC475 injectors in it and an unknown timing. It is suffering from low power (pretty sure from the pump not being matched to the injectors) and quickly overheats (possibly too advanced of timing) under load with a new water pump and thermostat and an okay (though not great) radiator. My customer wants to get this engine completely back to stock so we can rule the engine out as the cause for overheating, as he is not convinced that the radiator is the problem because it was fine with the last engine that was in this rig (also not the original engine). I have done research and gone on Cummins' site looking for the timing code, but I am not having much luck.

 

I appreciate all the responses! This is an engine that I am very familiar with as I freshened it up with rings, bearings, one piston, and one sleeve last year when it ate a piston and sleeve due to overheating. I'm also the one who installed the engine in this rig when the last engine split a sleeve due to age. My customer is the one that found this engine and had me install it as he did not want to spend the money to rebuild the last engine. The reason for wanting to go back stock on this engine is because it is in a drill rig so it runs full power all day, not like a semi where the power needs fluctuate and you can get away with more injector and more timing because it is able to cool back off. This engine has run hot ever since it was installed in this rig and we are tired of chasing our tails with this issue with the huge question of injectors and timing hanging over our head. We want to make absolutely sure that those items are not our problem.

In regards to setting timing at .070", is that the spec for all 400s? I was told (and could very well be mistaken) that the timing on high compression 400s such as this one was slowed down to prevent heat issues. I just want to make absolutely sure I have the right spec before digging into it as I know it isn't a small job to change timing on one of these engines. Thank you again!

 

Okay, I will clarify a few things. The serial number I provided is for the ORIGINAL industrial engine out of the drill rig. I did not provide the serial number for the engine currently in the rig as that will muddy the waters and is completely irrelevant for what I am needing. The drill rig was built with an NTCC400 with CPL310, which is indeed a 14.5-1 compression ratio, which I realize is not normal for a Big Cam 400, but it is correct for this application. The camshaft is also correct for this CPL. The injection pump, which has already been rebuilt to the proper CPL and fuel calibration, is the ORIGINAL pump to the drill rig. The injectors, which I have already ordered, are for CPL310, and therefore will work with the pump that is on the drill rig right now. I will have to double check which turbo is on the rig, but that is not the information I am looking for. The ONLY information I am currently looking for is what the timing code for CPL310 is. I just need somebody with a CPL book to check that information. The Cummins site is not providing that information, I already checked. I already checked with the local Cummins dealer, the site is not providing them with the information and unfortunately they do not have a CPL book. I appreciate the other advice I have been given, but none of it is answering my original question. I will contact M&D Distributors (who the injectors have already been ordered from) if I have to to see if they can provide the information I need, but I was really hoping somebody here already had a book and could just take a moment to check.