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Can you still install it? Different number of gear teeth just means it turns at a different ratio/speed - like change gears on a lathe...... That might be by design - we know there were several iterations of the pumps. Literally every listing for aftermarket pumps says 3116, 3126, C7. That's...

I suspect you have an issue with the injection actuation pressure sensor or it's wiring. The low +5v supply voltage code is making me suspect the sensor is going short circuit internally and pulling down the ECM's +5v sensor power supply although that only shows a single occurrence. I would be...

There's obviously a huge market for these. Aftermarket one's are everywhere and are CHEAP. I would not worry about it "working" - I would worry about the metallurgy and the heat treat of the gears and rotors, etc. Longevity might be the insidious killer here and the false sense of security of...

Note that the 3116/3126/C7 all use the "same" pump but there's been redesigns that may result in different part numbers. If it came off a C7 it will work.

There are TONS of these pumps on ebay also. Here's a 2008 pump that looks nice and you can see it is the gerotor style (makes my hopeful that my 2008 A1R has this style already). Reputable seller by the looks of the feedback. For the ridiculous price I would be tempted to save the $500 or...

Yeah I saw that but that's not the sack of buttholes - the pump just drops off the bottom of the engine. The UGLY part is the chipped drive gear tooth because I'm fairly certain changing that requires removing the timing cover. And it's pieces of those teeth that broke the pump housing - tip...

WOOF! The oil pump drive gear teeth! That's not nice of it. I would be tempted to just run it (the drive gear, not the shattered pump) but it would probably bother me forever and it could happen again and break another pump. That looks like a sack of buttholes to replace too. :cautious:

If this was my truck - I would pull the pan and check the pump condition. Given this numbers and the knowledge of the change in pump design..... I would have to see for myself. Looks to be a fairly easy job.

I misread your question. You need to cage all the rear wheel chambers - they all have parking brake springs. The front axle chambers are the ones that don't have parking brakes. Any chamber that has a caging bolt hole on the back will have to be caged.

They do all use the same oil pump. The listings I see show the same pump being used on 3116, 3126, and C7. So potentially yes the 3116 could have the older pump design and could be upgraded to the gerotor pump if needed or desired.

Just the parking brake chambers.

Yeah they switched from a gear pump to gerotor pump. They must have had reason to do this so probably worth changing it out if it has the older style.

Oil drain plug?

The A1 and even the A1R TM's do exist in normal PDF format without requiring EMS-NG, etc. It's a matter of finding them and that's not that hard as a veteran if you speak with the right people.

Doh! Chair Force doesn't have these trucks. But they should have a J1939 interface to talk to some systems. Make friends on the local Army base side of things. Trust me - you want to find a fellow veteran on the Army side. A Motor Sargent for a good sized unit with a lot of trucks can be your...

Motorpool can hook you up. Buy the Motor Sargent ANYTHING he wants - beer, food, strippers - ANYTHING. That guy can do you solid with TM's, diagrams, troubleshooting, parts from junk that's being turned in for DRMO, etc. You talk to the right people and rub them all the right ways and the...

Did they post a video of it running? Issues idling could be a lot of things, but with a diesel it usually comes down to fueling and that's a 3126B truck which means possible HEUI issues.