Cummins diesel main bearing identification & appearance

[fitterski]

I don't know where to post this, the _parts_ forum is for 'compact' tractors, plus this is only about an engine.

Rebuilding a Cummins 5.9 12-valve made in 1994 January-10 or October-01 (plate says 19940110) I got my hands on a set of main bearings that are supposedly new Clevites. The 2 problems are (see attached image)

1
the uppers look like they've already been installed once and probably quickly removed. It may be that someone had installed the uppers, then lowered the crank into the saddle, maybe turned it a couple of times before removing them (for whatever reason). They seem scored just ever so lightly. I would not consider this alone to be a serious issue.

2
the numbers stamped don't appear to be Clevite numbers, does anyone recognize whose numbers they might be and then what the decoding would be?

Thanks




Ok, I just noticed that the image is unreadably poor resolution

the 180 degree thrust bearing reads

4207RAU
STD
F/m
02 17
C0858

The uppers read

4206P U
F/m
STD
05 17
3542Y

the lowers read
4206_7PL
F/m
STD
3550Y

 

[jrdepew]

I don't know where to post this, the _parts_ forum is for 'compact' tractors, plus this is only about an engine.

Rebuilding a Cummins 5.9 12-valve made in 1994 January-10 or October-01 (plate says 19940110) I got my hands on a set of main bearings that are supposedly new Clevites. The 2 problems are (see attached image)

1
the uppers look like they've already been installed once and probably quickly removed. It may be that someone had installed the uppers, then lowered the crank into the saddle, maybe turned it a couple of times before removing them (for whatever reason). They seem scored just ever so lightly. I would not consider this alone to be a serious issue.

2
the numbers stamped don't appear to be Clevite numbers, does anyone recognize whose numbers they might be and then what the decoding would be?

Thanks


View attachment 537428

Ok, I just noticed that the image is unreadably poor resolution

the 180 degree thrust bearing reads

4207RAU
STD
F/m
02 17
C0858

The uppers read

4206P U
F/m
STD
05 17
3542Y

the lowers read
4206_7PL
F/m
STD
3550Y

Looks like Federal Mogul numbers to me.

 

[PJ The Kid]

Those are Federal Mogul bearings.

 

[fitterski]

Thanks guys, at least I know the make. I fired off an email to FM. If the bearings are the right size I should be good to use them. There's a plasticish layer on the inside faces except for the thrust half-bearing, it's this plasticised layer that shows just a touch of wear and only inside the upper halves.

 

[fitterski]

Just found out that the Cummins part# would be 4955853. What I don't wanna do is either install the wrong bearings or buy the manufacturer's set if the set I have on hand is just as good (# equivalent).

 

[fitterski]

[SOLVED] Re: Cummins diesel main bearing identification & appearance

Apparentlty they're FP-Diesel # FP-4955853 which is the good spec EXCEPT maybe for the fact that they're made in Mexico.

Thanks for the comments, they're under the crank already, done the plastigauge thing too: 0.004" to 0.005" on all journals VS spec 0.002"-0.0047" so I'll continue with the assembly.