Failed rebuild?

[Rawze]

(12-19-2025 )Josiah Harder Wrote:  .... Now does anyone know the values for crank case pressure measured in Inches of H2O that Cummins would consider to be "in spec" under load and regen for a new engine? I would also like to know whether my high crank case pressure readings could really have been caused by my non serviceable crank case filter needing replacing? This shop is telling me that they opened a case with Cummins and that everything is "within spec"
...

the 'In-Spec' rating for blo-by is RIDICULOUS HIGH from the red engine maker. - I would/can only assume its so high for the reasons of denying as many warranty claims as they have had issues with in the past with carbon packing problems, etc.

Its some ridiculous high allowance (link with some references below). --- and what they say is acceptable is WAAY TOO MUCH and has always been problematic in my opinion and it always has been!.

... and if you think its your crank case filter... REPLACE IT or DRILL IT OUT COMPLETELY hollow it all the way to the gasket only,.. and check the down-pipe to ensure it is not clogged with a dirt-dobber nest or some other ridiculous thing. That filter has always been the #1 cause of overhead cam failures and turbo slobber/bleeding issues on the ISX.

but at this point, its most likely those garbage parts more than anything else,.. as this is well known by those who have been in those shoes and learned the hard way already.

Some search results for blo-by related posts that are worth looking at...

https://rawze.com/forums/showthread.php?...11#pid4511
...and...
https://rawze.com/forums/showthread.php?...2#pid22392
...and...

And here is a redneck 'quick test' that someone can do, that also eliminates the crank case filter from the equation, to at least see if they need more accurate/ proper manometer tests done...

https://www.youtube.com/watch?v=-Og4jCM6Rfg

[Josiah Harder]

To find documentation, repair procedures, etc. I would suggest you get on quickserve.cummins.com and register for a free account. It is especially handy to have access to if you’re an owner operator with some interest in doing some things on your own.
[/quote]

Yeah you're right I have an account there already but wasnt able to find any of this information.

[TopGear]

Most shops in Canada cannot rebuild stuff properly with the OEM stuff. You cannot expect them to do it with junk parts either.

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The reason everything always seems cheap in the beginning is that is how the shop gets you as a customer by giving you a ridiculous price you cant say no to.

You advised the rebuild shop has opened a case with Cummins? Did that not raise any red flags to you? How would that be possible with aftermarket garbage...

Each engine is different and knowing how to rebuild a diesel isn't enough regardless of the experience, unless you spend tons of time working on them and getting successful results.. no way you will get a good rebuild. You sir will instead have a timebomb waiting for disaster.

I would highly suggest you become somewhat knowledgeable about how the red engines run or sell/trade it in for something else. Maybe you can pick up another truck for way less then the headaches that truck will give you?.

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The path you are going down is going to get darker the farther you go down with less and less people to help until you go broke.

The Diesel engines are not what they used to be in the past. The shops who can do the work correctly percentage wise is very low. Even the shops who can do them properly still don't have {reduced dust/clean} environment.

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These emission systems installed on these trucks cause the truck to behave in certain ways. When the parts are not up to standard you end up with defective parts or a part that has a short lifespan then its intended. Causing the owner of the truck to suffer. So did you really save money not really. Are you learning stuff about the engine that you as owner should not be wasting your time doing learning yes.. is it helpful maybe..

Most shops in Canada will give you 1 year warranty to fix problems with engine. I would either go back to the shop and tell them they need to fix it in which case you get a band aid over something that need stitches or you maybe sell it and start again with hopefully some better hard learned experience.