2004 cat3126

[602Solidarity]

Hi all. New to this. Just bought a 2004 Freightliner FS65 shortie with a CAT 3126. I'm seeing now that the newer 3126 engines don't have a great reputation -- though some posts say that the problematic emissions controls started "after 2004", which leaves me unsure as to whether a 2004 vehicle has problematic features.

Overall shes in great condition, but I'm worried by what I'm seeing written about these engines. Can anyone advise?

[o1marc]

The EGR changes went into effect in 04, some may have gotten through, but some of them have the gremlins.

[602Solidarity]

Is there a way to check which engine I have?

[Gustav]

Not positive, but didn't Cat switch to C7 for new emissions?

[o1marc]

" The Caterpillar C7 was designed mostly out of necessity vs. practicality. Caterpillar, needed to produce a new engine that was going to meet or exceed the Tier Ratings enacted by the EPA in 1994 to curb diesel engine emissions. The stricter Tier 4 emissions requirements went into effect January 1, 2004. The Caterpillar C7 was released in 2003, only months ahead of the Tier 4 ratings change, and replaced the popular 3126 model. Older CAT engines like the 3116 or 3126 were essentially grandfathered into the older tier rating requirements and did not need to be upgraded."


Looks like you're in luck.