This a problem that has plagued that motor. The only answer is a bad design. They did a recall for this issue. Check with your local dealer rep for Cat and see if they will still warrant this issue. Seeing as how Cat has stopped producing road engines you probably will not have good luck with this but I wish you well.
The ISB is a 5.9 variant of the 6BT, manufactured after the implementation of ACERT emissions standards in 2002.
Do you want to have no power at all? The M11 is a vocational truck engine... the way the truck is geared with the C15, I seriously doubt you want to stick an M11 in there. Not only that, but that's a post-ACERT truck... you can't put a pre-ACERT engine in it legally unless the truck was purchased as a glider kit.
The N14 was a 14 liter, inline six, heavy duty diesel engine made prior to the implementation of ACERT emissions regulations in 2002.
Advanced Combustion Emissions Reduction Technology
Engine Electronics and Effective after treatment.
There are four different oil filters that a CAT C15 Acert can use. From NAPA, the numbers for the filters are 7792, 1792XE, 1792XE , and 1792XD.
Not very. The 6NZ - the last of the single turbo Cats - was probably the best on-highway engine Cat ever made. Anything after that - MBN, Bridge Cat, and especially ACERT - was junk.
ACERT
Depends. If it was one made during the 6NZ era (which, IIRC, ended circa 2004), yes. The MBN, 'bridge' Cats, and ACERT models were junk, though.
It's doable... not sure how feasible it would be. You'll need the complete ECM and EGR from the 06 engine.... the 2002 would have the pre-ACERT LB7 engine, whereas the 2006 would be either the 6.6 LLY or 6.6 LBZ (depending on when in 2006).
Freightliner doesn't have a model called the "Condor", and never has. And yes, I get that you mean "condo", but the sleeper configuration has absolutely nothing to do with how the belts are routed. Was is vital is the information you've excluded... that being, the model year and engine make and model. So, as is, we don't know if you have a 12.7 60 Series Detroit, pre-ACERT Caterpillar, post-ACERT Caterpillar, or Cummins N14 or ISX.
The Cummins ISX is a family of post-ACERT heavy duty diesel engines.