How to tell if Cummins ISX is CM 870 or CM 871?

[Inthe70s]

I have a ‘07 Holiday Rambler w/525 Cummins ISX. The engine was manufactured in January 2006. I’m trying to determine if the engine is a CM870 or CM871. I looked at the plate on the top of the engine but I don’t see anything that identifies this. Can someone direct me to where I might look? Your efforts are greatly appreciated! 👍

[randomledder]

[Inthe70s]

Originally Posted by randomledder

Attachment 371159

I don’t know how you did that or where you got this information but thank you very much! This is awesome and greatly appreciated! 👍

[randomledder]

[emoji106]

[Smitty77]

Originally Posted by randomledder

Attachment 371159

Very nice Randomledder!


OP - Congrats on having a 'Dirty ISX!'...

Best to all,
Smitty

[Lowflyer1]

Originally Posted by Inthe70s

I don’t know how you did that or where you got this information but thank you very much! This is awesome and greatly appreciated! 👍

If you sign up to Cummins QuickServe with your engine serial #, you'll get that info and pretty much all the info you need for your engine: Engine diagrams, component locations, service procedures etc.
Keep in mind that the coach builder has most likely made some changes to the engine for easier service like moved the fuel filters to a different location, longer dipsticks to reach the rear etc.

https://quickserve.cummins.com/info/index.html

[Inthe70s]

Tha!nk you Lowfyer for that information and link. I went ahead and registered as it looks like a great resource!