M916 NTC-400 Big Cam I CPL

My M916 came with no dataplates anywhere, including the engine dataplate where the engine serial number and Cummins critical parts list number (CPL) should be stamped.

So what I'm hoping is that someone out there with a M915-M920 truck with a Big Cam I engine can tell me the CPL off of their engine. It should be stamped on the engine dataplate on the driver's side of the engine just forward of the air compressor.

I *think* it might be 0393, but I am unsure.

---

Sometimes I feel like I'm in the minority with a Big Cam I 400 vs all the people who have Big Cam III engines.

Here ya go

Awesome, thanks.

Is the tag on top of your PT pump legible? Or at least, photograph-ible?

ESN should stamped on the block. Fuel pump side, rear, at the area where the heads meet the block. Post it and I can post the build info

WillWagner said:

ESN should stamped on the block. Fuel pump side, rear, at the area where the heads meet the block. Post it and I can post the build info

Click to expand...

Cool, thanks. I will look and get back to you.

I think the ESN is 10767044

Above the starter is stamped -

30186
10767044

CPL 393
HP 400

Also, after getting a bunch of Ft Irwin moon dust removed, it turns out that there is a plate on my IP and it reads like this -

NTC-400 0002382
0393 3619-G

There is also a "20" with a square around it stamped into the top of the IP, as well as two backwards "C"s next to each other.

Tag on F/P,

0002382 is the s/n given to the part, the 20 in square indicates it is a ReCon fuel pump, the 20 is the week and the square denotes the year, this is of no use to you unless you were the purchaser of the part and were trying to get warranty on something.

0393 is the CPL of the engine, if you look at the tag on the engine, that number is there as well. This is used for performance parts ID so when the engine is repaired you know all the parts work together.

3619G is the pump code. This code, when looked up in the PT fuel pump index will tell the rebuilder what combination of springs, barrel and plunger assemblies to use and at what set points a given fuel pressure and flow are to be set at. This is important for a smooth, quick, smoke free acceleration and so the engine makes the correct torque/power throughout the rpm range.

10767044 is the esn, original build says it is a big cam NTC 250

Wow!!

didn't even look at the post I did, someone came over. Here is a copy/paste of the image above, sorry.

PRINT ENGINE DATAPLATE

Engine Dataplate - (Original) VIN:
Marketing Model Name	Service Model Name	EPA Model Name
NTC-250 BIG-CAM	NH/NT 855	Not Available
Shop Order	Build Plant	Build Date
SO20902	CEP - Columbus Engine Plant	23 Aug 1978
Warranty Start Date	ECM Code	Fuel Pump Part #
05 Mar 1979	Not Available	3015908
Fuel Pump Calibration	Marketing Engine Configuration #	Technical Engine Configuration #
3369	Not Available	D092265BX02
CPL #	Customer Number	Customer Name
CPL323	Not Available	01768

Why?

Castle Bravo said:

My M916 came with no dataplates anywhere, including the engine dataplate where the engine serial number and Cummins critical parts list number (CPL) should be stamped.

So what I'm hoping is that someone out there with a M915-M920 truck with a Big Cam I engine can tell me the CPL off of their engine. It should be stamped on the engine dataplate on the driver's side of the engine just forward of the air compressor.
---

Sometimes I feel like I'm in the minority with a Big Cam I 400 vs all the people who have Big Cam III engines.

Click to expand...

I can't resist asking why you are needing this information? As a fellow M916 Cummins Big Cam I w/Allison 7 speed transmission, I am intrigued.

WillWagner said:

didn't even look at the post I did, someone came over. Here is a copy/paste of the image above, sorry.

PRINT ENGINE DATAPLATE

Engine Dataplate - (Original) VIN:
Marketing Model Name	Service Model Name	EPA Model Name
NTC-250 BIG-CAM	NH/NT 855	Not Available
Shop Order	Build Plant	Build Date
SO20902	CEP - Columbus Engine Plant	23 Aug 1978
Warranty Start Date	ECM Code	Fuel Pump Part #
05 Mar 1979	Not Available	3015908
Fuel Pump Calibration	Marketing Engine Configuration #	Technical Engine Configuration #
3369	Not Available	D092265BX02
CPL #	Customer Number	Customer Name
CPL323	Not Available	01768

Click to expand...

Thank you!

So, is there anything to glean from all this? Whats with the NTC-250 part?

ev2bfree said:

I can't resist asking why you are needing this information? As a fellow M916 Cummins Big Cam I w/Allison 7 speed transmission, I am intrigued.

Click to expand...

The CPL is the genetic code of the engine. If you can't provide it to the Cummins counterman, they will send you away.

ev2bfree said:

I can't resist asking why you are needing this information? As a fellow M916 Cummins Big Cam I w/Allison 7 speed transmission, I am intrigued.

Click to expand...

I just wanted to know. I didn't know the CPL until recently, because my engine data tag was gone and I didn't know it was listed on the pump and on the block as well.

Castle Bravo said:

Thank you!

So, is there anything to glean from all this? Whats with the NTC-250 part?

Click to expand...

It meant that the ESN you supplied is for an NTC 250, not a 400. 250hp v.s. 400hp. If you went to a parts place and gave them the ESN supplied here, you would get parts for a 250 HP engine. Heads are the same as are rods, bearings, rockers, but performance parts like turbo, injectors, fuel pump, cam and key, are different. If you assembled an engine with mismatched parts, you would have a helluva time figuring out the issues the engine had after a repair

WillWagner said:

It meant that the ESN you supplied is for an NTC 250, not a 400. 250hp v.s. 400hp. If you went to a parts place and gave them the ESN supplied here, you would get parts for a 250 HP engine. Heads are the same as are rods, bearings, rockers, but performance parts like turbo, injectors, fuel pump, cam and key, are different. If you assembled an engine with mismatched parts, you would have a helluva time figuring out the issues the engine had after a repair

Click to expand...

Maybe I messed the number up, I'll check again.

So my CPL # is 393 which I am told is 14.5 to 1 compression. I drove to Whitehall, OH to pick up the M1074 10 X 10 and the M916 started to smoke excessively and was way down on power. The Cummins dealer tore into the motor to find scoring on the liners #2 and #6. Their best guess is "Lot Rot" from it being a 1979 and only having 279 hours on it when I got it. I talked to Pete at Pittsburg Power and he said as long as I was rebuilding the motor to use CPL 449 specs to get 14 to 1 pistons and LPF liners with Ceramic/Teflon Pistons. This would be a great base for more fuel and boost later. Anyone here gone into the motor on the Big Cam 1?

What are the other tell tales to determine a 250 vs 400 ?

Matt,

Use the CPL from the block. Which will be 393. That 323 in on quick serve comes back to a 249 cpl actually for a ntc290 with 16.0 : 1 pistons. I am sure you have the 14.5s in the BC1

As far as NHC250 to 400 parts. Everything lower half seems to match. Crank is different due to the front balancer mounting however the rods, main and crank Bearings are the same. Cam is different of course. The heads swap except for the crossheads they are different part numbers due to the Jakes