CM 871 won’t regen

[Rawze]

(05-06-2019 )theironoracle Wrote:  I don’t know how to prove except perhaps putting a boroscope the intake and exhaust manifolds?

This could be left over from the last turbo failure?

could be worn or leaky valve guide seals. May also want to check to see if the intake manifold is getting wet from the turbo. If someone idles a lot, the turbo's opn the ISX tend to slobber a bit.

At the very least, check the IMAP sensor to see if it is getting clogged up again. This will give you an idea of how much soot the engine is making since the last time that sensor was replaced.

(05-06-2019 )theironoracle Wrote:  ...
Could it actually be from a leaky doser injector?
...

If you suspect the Doser leaky, it is easy to check. Just pull the doser pipe away from the back of the turbo a bit and crank the engine up. - If the Doser is leaky, the tip will start getting wet after you crank the truck up. While your at it, take a tiny wire brush to it and clean it gently to ensure the tip it is not impacted with soot.

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Since it is an ongoing problem, you might want to also pressurize the entire engine and check it for intake, CAC, and EGR piping leaks. Any leaks contribute to excess soot issues. also maybe check the overhead cam(s) for excess wear or them being chewed up from valves getting too tight. Do an overhead valve adjustment if it has not been done since the engine was last built. The head and its valve seats on the ISX will settle after 50,000 miles or so and the valves can easily get out of adjustment.

You say it was re-manned a year ago,.. where did the head come from? - Was it a brand new cummins head (or at least a CERT re-man directly from cummins)? - If not,.. then the odds are strongly against the truck owner that the engine is not going to last more than about 250k miles before the head needs replacing again any ways.

Last is the fact the if the EGR valve gets sticky, it will not throw a fault in the ECM. It should be considered as well if there is excess soot getting into the oil or intake. - Has anyone done an oil sample and sent to a lab to see if the soot levels in the oil are too high?