The A26 is the same MAN engine as the Maxxforce with updated injection and emission sytems. And even in the case of the Maxxforce, the engine itself is not bad. It is the injection and emission system they put on it.
[The A26 is based on the crankcase of a D26 engine from MAN – a German truck and engine manufacturer wholly owned by Volkswagen. According to Darren Gosbee, vice president of advanced engineering for International, the new A26 diesel engine produces up to 475 horsepower and 1,750 lb. -ft] Same as the Maxx, same as the N13.
The doser can be removed by turning the steering wheels all the way to the left, and then remove the right side inner fender and you can crawl up in there. The doser doesn't have to be unbolted. You can remove the center core which is basically the pintle valve. Just take the fuel line off and unscrew the pintle like a spark plug. That way you don't have to drain the coolant and fight. The switches in the center dash use the stereo tool, but the switches below the cluster do not come off like that. Cluster has to come out to work on those.