Cm871 valve cam part number mystery

[AussieISX]

(06-27-2017 )dhirocz Wrote:  So, after loosing the good fight that I got drug through the mud with for 4 months, I'm left to myself to fix my truck. No other good options. On top of that I'm about to loose my loaner...because I 'should have' fixed it by now even though my rolling junkyard of a loaner truck has spent most of it's time as a dealer decoration.

...and in accordance with my great luck, I found a leaking head gasket and a liner leak on my 871 to go along with the cam I have to fix. No avoiding it now, it needs some work here. Heads gotta come off. You know what that means... 685k miles on it.

I have enough to buy parts and tools. That's it. Fortunately, I'm very mechanically inclined.

I'm finding alot of different part numbers for isx valve cam. 4298626, 4059331, 4298629 to list a few.

I'm finding references stating that the cam from a 2250 fits an 871 and others. I'm having a hard time swallowing that but I might be wrong.

I also know there was a revised camshaft with wider lobes I believe, which would also require a change in rocker arms if I'm not mistaken. A call to Cummins gives me the typical idiotic shrug of a response aside from 'they fixed the cam issue, buy a recon'. Uh, no.

I don't know if these are parts number changes, actual newer compatible revisions or whatever. I know I found an 8629 NIB Cummins cam for $600 but won't buy it unless I know for a fact it'll work right. I don't need to confuse the ECM.

Anyone care to enlighten me? I've got a 2010 cm871. Valve cam is toast, among other things.

The 4298626 is the new pn for 4059331. It has the wider lobes on the intake and exhaust (now same width as the jake lobes). You don't have to change rockers to suit if you choose not too . The information regarding the same cam used between 871/2250 is correct , in fact the Australian cpls they use the same valve cam in the cm570-2250