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Rawze · 01-31-2017, **(Subject: Cm871 vs 2250/2350 )**

(01-31-2017 )Rockycoon75 Wrote: They wouldn't do it. Back online and their website for sale. Same price and no mention of the problems. Sad from a oem dealership.

Is there anything on the Cams that show they are close to the end of their life? I explained discoloration, edge chipping, dull color? I've seen ones in gas motors after they go bad but never been able to monitor a overhead one in a motor. Thanks for all of the help

Here is one.

RPM1 · 01-31-2017, **(Subject: Cm871 vs 2250/2350 )**

(01-31-2017 )Rawze Wrote:
(01-31-2017 )Rockycoon75 Wrote: They wouldn't do it. Back online and their website for sale. Same price and no mention of the problems. Sad from a oem dealership.

Is there anything on the Cams that show they are close to the end of their life? I explained discoloration, edge chipping, dull color? I've seen ones in gas motors after they go bad but never been able to monitor a overhead one in a motor. Thanks for all of the help

Here is one.

bad casting there , porosity / shi#t in the steel

Rockycoon75 · 01-31-2017, **(Subject: Cm871 vs 2250/2350 )**

(01-31-2017 )Hammerhead Wrote:
(01-31-2017 )Rockycoon75 Wrote: Yes sir. I has a deal made on a 09. Made them pressure check coolant, dyno, and pop the valve cover. Needed intake cam and overhaul so I'm back to shopping. Trying to be cautious and read and learn as much as I can. Just don't know much about the 2250/2350 stuff.

If the '09 is going to have an inframe and has the 18 speed, that's the truck right there.
IMHO, that's the one I'd buy.
Fresh inframe, find someone to MM that baby right quick, put a bypass filter it, and smile all the way...

It does but somebody currently has a deposit seeking credit approval. So I have to wait and see on it. That's the one I truly want

Hammerhead · 01-31-2017, **(Subject: Cm871 vs 2250/2350 )**

(01-31-2017 )Rockycoon75 Wrote: It does but somebody currently has a deposit seeking credit approval. So I have to wait and see on it. That's the one I truly want

Well, best of luck!
I've actually seen cams quite a bit worse than the one Rawze posted a pic of.
-The best maintainence you can do for them, shim the oil pump to create more oil pressure, which results in superior protection IMHO. A fair amount of us on here have done this. We do not have years and years, with millions of miles on many engines to scientifically prove this theory, but no one has disproved it either.
-Frequent overhead adjustments reduce the risk of valve(s) wearing enough to eliminate rocker clearance causing the rollers to ride the cam continuously not allowing the oil to get where it needs to be. I now do them annually.
-Frequent visual inspections will catch issues early, possibly limiting you to either a cam going bad, but the rocker rollers not when you spot it, or vice versa. Popping a rocker cover is so simple and requires such a small time investment, I do this quarterly.

When you are inspecting a potential used truck for purchase, not popping the rocker cover is inviting disaster. I have been pointed to some heavy equipment forums discussing cam issues in Cats as well. There are many anecdotes on this site of other engine mfg's with cam issues as well, it's a gamble I would simply not take.

Rig Wrench · 01-31-2017, **(Subject: Cm871 vs 2250/2350 )**

(01-31-2017 )Rockycoon75 Wrote: I'm truck shopping and have a few options. I'm really after a 09 kw with a cm871 with fresh cummins overhaul. It has 600 miles but it may already be sold. Next to options are a 2010 with a cm871 with 420k still a Virgin. The 3rd option is a 12 with a 2250/2350 (don't know enough about them to know the difference) with 550k on it. Not sure which motor is a better one. Going to be pulling hopper 80k+ in the mid west and south east. Pretty similar specs otherwise. Thanks.

I'd stick with an 871 over the 2250. Much better platform for constant 80k+ work. Bigger turbo, lower compression, no finicky common rail system, ect ect. With certain tweeks they are as responsive or moreso than the 2250. Chances are if its an 871 over 550hp at this point, counter bores probably have been done. A 2250 may be comin up on needing them..

Rawze · 02-01-2017, **(Subject: Cm871 vs 2250/2350 )**

(01-31-2017 )RPM1 Wrote: bad casting there , porosity / shi#t in the steel

Engine components are not made as well as they used to be years ago, but even still, it is not bad casting that did this one in.

The one in the picture is simply the result of not changing your oil often enough and carbon/soot packing. Pretty common on them for people who think they can go 25k+ miles at a time, have EGR issues, and/or use synthetic and extended oil changes.