It is based on an earlier design (3116), and when it was retired, the CAT C-7 was based on it and was it’s replacement. It was used in everything from boats, cranes, over the road trucks and ambulances to RVs and buses. The Caterpillar 3126 engine is a CAT engine that was used for light and medium duty uses. But if you are just using it in your RV, and you don’t have a lead foot, I think you’ll be just fine. If you try to use it for a heavy duty, continuous duty cycle application you’ll be disappointed. My conclusion is that I believe the 3126 is a very good engine. If they really were THAT BAD there would be a lot more first hand accounts online. Here’s the thing, even though the 3126 is bad mouthed all over the internet there are thousands, and likely 10s if not hundreds of thousands of these engines around and still in use. internet forums posts) so take it with a grain of salt. Everything in this post is based on hearsay (i.e. Hopefully it is a reasonably accurate distillation of many many hours of research. This is a summary post of a bunch of research I’ve done….
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February 2023
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